EN 14385:2024

SLOVENSKI STANDARD
01-april-2025
Nadomešča:
SIST EN 14385:2004
Emisije nepremičnih virov - Določanje celotne emisije As, Cd, Cr, Co, Cu, Mn, Ni,
Pb, Sb, TI in V
Stationary source emissions - Determination of the total emission of As, Cd, Cr, Co, Cu,
Mn, Ni, Pb, Sb, Tl and V
Emissionen aus stationären Quellen - Bestimmung der Gesamtemission von As, Cd, Cr,
Co, Cu, Mn, Ni, Pb, Sb, Tl und V
Émissions de sources fixes - Détermination de l'émission totale de As, Cd, Cr, Co, Cu,
Mn, Ni, Pb, Sb, TI et V
Ta slovenski standard je istoveten z: EN 14385:2024
ICS:
13.040.40 Emisije nepremičnih virov Stationary source emissions
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 14385
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 13.040.40 Supersedes EN 14385:2004
English Version
Stationary source emissions - Determination of the total
emission of As, Cd, Cr, Co, Cu, Mn, Ni, Pb, Sb, Tl and V
Émissions de sources fixes - Détermination de Emissionen aus stationären Quellen - Bestimmung der
l'émission totale de As, Cd, Cr, Co, Cu, Mn, Ni, Pb, Sb, TI Gesamtemission von As, Cd, Cr, Co, Cu, Mn, Ni, Pb, Sb, Tl
et V und V
This European Standard was approved by CEN on 25 November 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14385:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions, symbols and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Symbols . 9
3.3 Abbreviated terms . 9
4 Principle .10
5 Apparatus and chemicals .10
5.1 General .10
5.2 Chemicals and filter material .13
6 Sampling equipment .15
6.1 General requirements .15
6.2 Isokinetic sampling equipment .16
6.3 Absorbers and absorption efficiency .16
7 Cleaning of the sampling equipment prior to sampling .17
8 Procedure.17
8.1 General requirements .17
8.2 Preparation and installation of equipment .18
8.3 Performance of the sampling .19
8.4 Disassembling the equipment .19
8.4.1 General .19
8.4.2 Disassembly of the filter housing .19
8.4.3 Rinsing of the sampling equipment .19
8.4.4 Rinsing of the connection tubing to the first absorber .20
8.4.5 Handling of the absorption solutions from the absorbers .20
8.5 Field blanks .20
8.6 Requirements for storage of the samples .21
8.7 Pre-treatment before analysis .21
8.7.1 General .21
8.7.2 Pre-cleaning of the digestion equipment .21
8.7.3 Treatment of CRM and filter .21
8.7.4 Pre-treatment of absorption solutions .23
8.7.5 Pre-treatment of rinsing solutions .23
8.8 Analysis .23
9 Expression of results .25
10 Test report .28
Annex A (informative) Examples of absorption vessels .29
Annex B (informative) Types of isokinetic equipment and leak test methods .30
B.1 Types of isokinetic equipment .30
B.2 Leak test methods. 31
Annex C (informative) Pre-cleaning procedures of the sampling equipment at the laboratory
and determination of the absorption efficiency . 34
C.1 General . 34
C.2 Chemicals . 34
C.2.1 General . 34
C.2.2 Rinsing solution . 34
C.2.3 Diluted aqua regia . 34
C.2.4 Laboratory cleaning solution . 34
C.2.5 Dilute hydrogen peroxide . 34
C.2.6 Rinsing acid . 34
C.3 Equipment . 34
C.3.1 Procedure A . 34
C.3.2 Procedure B . 35
C.3.3 Procedure C. 35
C.4 Absorption and storage bottles . 35
C.4.1 Procedure A . 35
C.4.2 Procedure B . 35
C.4.3 Procedure C. 35
C.4.4 Procedure D . 35
Annex D (informative) Measurement results of two field tests . 36
D.1 General . 36
D.2 Absorption efficiency . 36
D.3 Repeatability . 36
D.4 Reproducibility . 38
Annex E (informative) Pre-tests for the determination of the efficiency, of the digestion
and of the performance of the analytical procedures . 40
E.1 Analytical efficiencies of reference materials . 40
E.2 Comments of field study data . 42
E.2.1 General . 42
E.2.2 Pre-treatment and analysis . 43
E.2.3 Absorption efficiency . 43
E.2.4 Detection limit . 43
E.2.5 Repeatability and reproducibility . 43
Annex F (informative) Example of assessment of compliance of the standard reference
method . 44
F.1 Introduction . 44
F.2 Elements required for the uncertainty determinations - Model equation .44
F.3 Example of an uncertainty calculation in case of side-stream sampling system .44
F.3.1 General .44
F.3.2 Determination of the model equations .45
F.3.3 Equations for calculating combined uncertainties of gas volumes sampled in
standardized conditions .47
F.3.4 Equations for calculating combined uncertainties of concentrations .48
F.3.5 Quantification of standard uncertainty components .51
F.4 Estimation of measurement uncertainty in case of main-stream sampling system .64
F.4.1 General .64
F.4.2 Determination of the model equations .64
F.4.3 Equations for calculating combined uncertainties of gas volumes sampled in
standardized conditions .65
F.4.4 Equations for calculating combined uncertainties of concentrations .65
Annex G (normative) Determination and reporting of limits of detection and quantification
....................................................................................................................................................................68
G.1 Introduction to Limit of Detection and Quantification .68
G.2 Limit of detection (LoD) .69
G.3 Limit of quantification (LoQ) .69
G.4 Rules to be adopted when summing the various parts of a metals sample train where
the levels are at LoQ or below .69
Annex H (informative) Alternative digestion method for the filters by use of an HF-free
digestion Mixture [3],[4].73
H.1 Background to alternative method .73
H.2 Reagents .73
H.3 Digestion of filter .73
H.4 Analysis .73
Bibliography .74

European foreword
This document (EN 14385:2024) has been prepared by Technical Committee CEN/TC 264 “Air quality”,
the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 14385:2004.
The main changes compared to the previous edition are listed below:
3 3
— in the Scope: Range of specific elements widened from 0,5 mg/m to 5 mg/m ;
— in the Scope: Table 1 Exhaust Gas matrix composition deleted;
— in Clause 3: Definitions clarified and widened;
— in Clause 3: Elements split into Groups A and B for clarity;
— in 5.1.2.7.2: Correction using a wet gas meter has been clarified;
— in Clause 5: Definitions of Chemicals and Quality have been clarified;
— in Clause 5: Leak check methods has been moved to Annex B;
— in Clause 8: Treatment of Data from field blanks has been clarified and made explicit;
— in Clause 9: Expression of results has been clarified and treatment of data where a wet gas meter has
been used has been expanded;
— in Annex F: Example of an Uncertainty Budget Assessment of the Standard has been added;
— in Annex G: Determination and reporting of limits of detection and quantification added and
information on how to deal with elements below the level of quantification;
— in Annex H: Alternative digestion method for filters by use of an HF-free digestion Mixture.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
This document specifies a method for the determination of the total mass concentration of specific
elements in waste flue gases. The document was validated for waste incinerators but is also applicable to
other industrial processes. During the establishment of this document, field tests were performed in
order to determine some performance characteristics. These tests showed that in the “gaseous” phase
most of the elements cannot be determined quantitatively in the absorption solutions. Therefore, the
results of this method are expressed as the total element mass concentrations (i.e. sum of gaseous,
dissolved in droplets, solid and adsorbed on particles). This means that when the specific elements are
mainly in the solid phase no significant losses (biases) should occur due to the poor absorption efficiency
for the elements in the gaseous phase. The quality check requirement for approval of the results is the
mass in the last absorber expressed as a minimum percentage of the total mass; this minimum is set at a
high level, based on the experiences of the absorption efficiencies in the field tests.
1 Scope
This document specifies a manual reference method for the determination of the mass concentration of
specific elements in stationary source emissions. The method is applicable to each of the specific elements
3 3
in the concentration range of 0,005 mg/m to 5 mg/m .
This document has been validated for the determination of the mass concentration of metals in
incineration exhaust gases – applying the performance criteria stated in Clause 9 – for the following
elements:
— arsenic (As), cadmium (Cd), chromium (Cr), cobalt (Co), copper (Cu), manganese (Mn), nickel (Ni),
lead (Pb), antimony (Sb), thallium (Tl), and vanadium (V) and their compounds.
The document can be used to determine metals other than those listed above (for example, selenium (Se)
(ISO 17211), tellurium (Te), beryllium (Be), tin (Sn) and zinc (Zn)).
NOTE 1 These other metals mentioned above are commonly required by National Regulations, but this
document currently has not yet been validated for these metals.
The document was validated for waste incinerators, but it is also applicable to other industrial processes,
the practical experience shows that it can be applied over wide concentration ranges and various
emission sources.
If mercury is intended to be determined as well, this can be sampled in a side stream arrangement of the
sampling train (EN 13211) [5].
NOTE 2 This document has been validated with the described materials, equipment, sampling, and digestion
performances etc., followed by analyses with atomic absorption spectroscopy (AAS) and inductively coupled plasma
optical emission spectroscopy (ICP-OES,) or inductively coupled mass spectrometry (ICP-MS). This does not exclude
the use of other types of equipment or analyses that meet the requirements and have been proven to be equivalent
to the described European Standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13284-1:2017, Stationary source emissions - Determination of low range mass concentration of dust -
Part 1: Manual gravimetric method
EN 15259, Air quality - Measurement of stationary source emissions - Requirements for measurement
sections and sites and for the measurement objective, plan and report
3 Terms and definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
absorber
device in which specific elements are absorbed into an absorption liquid
3.1.2
chemical blank
solution used to check the purity of the chemicals employed by the laboratory
Note 1 to entry: The chemical blank value is determined by analysing the solution (5.2.8) used for the absorption
of the specific metal elements, plus any reagents that are added to the solution before analysis including the rinsing
solution (5.2.11) if this is used at any stage in the sampling and analysis procedure. This chemical blank is to be used
as a blank for all digestions using reagents all from the same batch. Furthermore, this chemical blank should be the
same as the solutions used for dilution of laboratory standards, etc. It represents the potential background elements
arising from the chemicals used in the analysis. This chemical blank can be subtracted if required from the analysis,
if necessary, by the analytical laboratory. However, where it is subtracted this should be identified in the analytical
report.
3.1.3
filter blank
value determined for each specific element by treatment and analysis of an unused filter which has been
taken from the same batch as the sample filters
Note 1 to entry: Chemical blanks and filter blanks may be subtracted from the analysis and if the level is then below
zero the level will be reported as the level of quantification. If chemical or filter blanks are repeatedly high requiring
subtraction, then an investigation as to the quality of the reagents or filters should be conducted to ensure that
subtraction of the chemical or filter blank is not masking the use of poor quality of reagents or filters.
3.1.4
field blank
sample of filter, absorption and rinsing solutions taken at site without sampling gas and analysed as a
normal sample
Note 1 to entry: The field blank is not to be subtracted from the samples and shall be reported separately.
Note 2 to entry: An explanation is provided in 8.5.
3.1.5
filtered material
material collected on the filter
3.1.6
filter passing material
component passing through the filter and recovered in the rest of the absorption system
3.1.7
fritted gas distributor
part of the absorber where the gas stream is distributed into the absorption liquid
3.1.8
Group A elements
arsenic (As), chromium (Cr), cobalt (Co), copper (Cu), manganese (Mn), nickel (Ni), lead (Pb), antimony
(Sb), vanadium (V) and their compounds
3.1.9
Group B elements
cadmium (Cd) and thallium (Tl) and their compounds
3.1.10
sampling
process consisting of the collection of gas pollutants from process gases or the withdrawal
or isolation of a fractional part of a larger volume of process gases
Note 1 to entry: To ensure sampling is representative the isokinetic sampling procedural requirements specified
within EN 13284-1 and EN 15259 should be adopted.
3.1.11
sampling campaign
sampling at one duct or location during one site visit
3.2 Symbols
For the purposes of this document, the following symbols apply.
A Cross section area, in square metres (m )
Q Flow rate of the sampled gas, in cubic metres per hour or litres per minute (m /h or l/min)
T Temperature, in Kelvin (K)
V Gas volume dry at standard conditions, in cubic metres or litres (m or l)
L Leakage rate (volume ratio)
O Oxygen volume content of the flue gas, in percentage (%)
m Mass, in milligrams (mg)
n Number of absorption vessels
p Pressure, in kilopascals (kPa)
P Partial vapour pressure, in kilopascals (kPa)
v
C Mass concentration, e.g. in milligrams per cubic metre (mg/m ); grams per litre (g/l)
ε Absorption efficiency
w Mass fraction in percent (%)
Density, in kilograms per litre (kg/l) at 20 °C related to that of water at 4 °C
ρ
−1
ρ Specific conductivity, in micro-Siemens per metre (µSm )
κ Specific resistance, in mega-Ohm-metre (MΩm)
H Humidity, in percentage volume of gases at wet gas meter inlet
m
H Humidity, in percentage volume of gases at required reporting conditions
a
3.3 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply.
CRM Certified reference material
El Specific element
ELV Emission limit value
FEP Polyperfluoroethene/polyperfluopropene
PE Polyethene
PFA Perfluoroalkoxy compounds
PP Polypropene
PTFE Polytetrafluoroethene
amb Ambient; index
ave Average
gas Gaseous; index
main Mainstream; index
side Side stream; index
mes Temperature, pressure at measuring conditions; index
b Humidity, pressure, temperature at measuring conditions; index
f Wet at standard conditions; index
sol Particle bound; index
norm Normalized to a reference dry oxygen content of x % (volume fraction); index
per Permitted; index
obs Observed; index
int Internal; index
0 Temperature at standard condition of 273 K, pressure at standard condition of 101,3 kPa,
dry volume at 273 K and 101,3 kPa; index
4 Principle
A known volume of flue gas is extracted isokinetically and representatively from a duct during a certain
period of time at a controlled flow rate following EN 13284-1. The dust in the sampled gas volume is
collected on a filter. Thereafter, the gas stream is passed through a series of absorbers containing
absorption solutions and the filter passing fractions of the specific elements are collected within these
solutions.
The filter, absorption solution and rinsing solutions are recovered for analysis.
The filter sample is digested in a closed PTFE vessel.
The absorption liquids and the rinsing solutions are prepared for analysis.
The samples are analysed and the final result is expressed as the total mass concentration for each
specific element and no distinction is made between filtered and filter passing fractions.
5 Apparatus and chemicals
5.1 General
All parts coming into contact with the sample are to be made of corrosion resistant and inert material, i.e.
borosilicate glass, quartz glass, PTFE, or titanium. As commercial titanium can contain some of the
specific elements to be determined care shall be taken to avoid contamination.
All materials should be suitable for the temperature and flue gas composition they are likely to encounter
during the sampling period and remain inert under these conditions and during recovery of the sample.
There have been reports that titanium can undergo thermal oxidation under some conditions and at
temperatures above 300 °C and where fluoride levels are > 20 ppm and hence lead to contamination
issues.
5.1.2 Apparatus for sampling
5.1.2.1 Nozzle, (see a) 1 of Figure B.1)
The diameter shall be chosen to be compatible with the required gas sampling volume flow rate; the
choice of the nozzle shall be in accordance with EN 13284-1.
5.1.2.2 Filter housing and filter support, (see a) 3 of Figure B.1)
The filter housing and filter support shall be in accordance with EN 13284-1.
5.1.2.3 Sampling probe, (see a) 2 of Figure B.1)
5.1.2.4 Absorbers
Fritted gas bubblers or impingers are to be used; for examples see Annex A. The absorbers shall be cooled
to a temperature less than or equal to 30°C to avoid excessive evaporation from the first absorption bottle
and to aid absorption efficiency. A cooling/ice bath could be used to limit the temperature of the absorber
which will improve the absorption efficiency and improve the drying of the gas stream prior to it reaching
the dryer.
5.1.2.5 Connection fittings and tubing
Ball joints and other connectors made of the materials stated in 5.1.1 are allowed. PTFE lined seals are
also allowed.
For the main-stream arrangement of the sampling equipment, the material requirements specified in
5.1.1 shall be applied from the nozzle to the last absorber; for the side-stream arrangement these
materials shall be applied from the nozzle to the T-piece and from the T-piece to the last absorber in the
side-stream sampling train.
The length of connections (such as tubing) from the sampling probe to the absorbers shall be minimized
and less than 1 m.
5.1.2.6 Suction unit
Depending on the arrangement of the equipment (see Annex B) two suction units can be required for one
sampling line.
The suction unit(s) shall be gas-tight, corrosion-proof, and capable of extracting at least the desired gas
flow rate(s) at the pressure conditions present in the flue gas duct. Wide adjustments of the sample flow
rate(s) shall be facilitated using regulating and/or by-pass valves. Shut-off valve(s) for stopping the gas
flow or back flow, due to potentially low pressures in the duct, should also be available.
If a variant of the sampling train with flow division is chosen, the volume flow rate in the secondary line
shall be taken into account in order to calculate the required volume flow rate in the main line.
NOTE Measures for the protection of the suction unit(s) such as filters, water traps, etc. can be useful.
Flow meters which are gas-tight and corrosion-proof (variable area meters, orifice plates, etc.) are
strongly recommended to check the sampling flow rate.
5.1.2.7 Gas volume metering
5.1.2.7.1 General
In accordance with EN 13284-1 two kinds of systems may be used to measure the gas volume:
— volume measurements on a dry basis;
— volume measurements on a wet basis.
5.1.2.7.2 Gas volume meter
The requirements for the flow rate measurements on a dry basis are:
— atmospheric pressure measuring device;
— condenser and/or gas drying tower providing a residual humidity less than 10 g/m at the maximum
flow rate;
— gas-tight suction device (such as compressed air ejector, pump, etc.);
NOTE 1 Gas-tightness is not necessary if the pump is positioned downstream of the metering device.
— flowmeter, in order to facilitate the flow rate adjustment, calibrated against the dry gas volume
meter;
— dry gas volume meter providing gas volume measurement shall have a maximum expanded
uncertainty of 5 % at the anticipated flow rate, incorporating the associated absolute pressure and
absolute temperature measurement uncertainties (maximum expanded uncertainty of 2,0 % each);
The requirements for the flow rate measurements on a wet basis are:
— heated tubing, in order to prevent upstream condensation of the sample gas;
— heated orifice plate or equivalent device (flow meter), shall be calibrated within 10 % maximum
expanded uncertainty of the anticipated flow rate; the uncertainty of temperature, pressure
(absolute and differential) measurement shall be less than 2 %;
— gas-tight suction device (such as compressed air ejector, pump, etc.);
NOTE 2 Gas-tightness is not necessary if the pump is positioned downstream of the metering device.
— atmospheric pressure measuring device;
— when using a wet gas volume measurement system (gas volume meter, critical orifice, etc.),
measurement of the flue gas water vapour content at the gas volume meter is required to allow the
gas wet volume to be corrected to a dry basis, see Formula (1):
𝑃𝑃−𝑃𝑃 100−𝐻𝐻
𝑣𝑣 𝑚𝑚
( )
𝑉𝑉 𝑑𝑑𝑑𝑑𝑑𝑑 =𝑉𝑉 . =𝑉𝑉 . (1)
𝑚𝑚𝑚𝑚𝑚𝑚 𝑚𝑚𝑚𝑚𝑚𝑚 𝑚𝑚𝑚𝑚𝑚𝑚
𝑃𝑃 100−𝐻𝐻
𝑎𝑎
See symbols 3.2 and abbreviations 3.3.
P is the partial vapour pressure of water in the gas meter;
v
P is the absolute pressure in the gas meter;
H is the water content of gases entering wet gas meter;
m
H is the water content at the reporting conditions.
a
In the particular case of a wet gas volume meter, it can be assumed that the gas is saturated at the gas
volume meter temperature (T). The partial vapour pressure P is then equal to the saturation vapour
v
pressure P of the water at the gas volume meter temperature, see Formula (2):
sat(T)
𝑃𝑃−𝑃𝑃
𝑚𝑚𝑠𝑠𝑤𝑤(𝑇𝑇)
𝑉𝑉 =𝑉𝑉 . (2)
𝑚𝑚𝑚𝑚𝑚𝑚(𝑑𝑑𝑑𝑑𝑑𝑑) 𝑚𝑚𝑚𝑚𝑚𝑚(𝑤𝑤𝑚𝑚𝑤𝑤)
𝑃𝑃
5.1.2.8 Storage bottles
The bottles for the storage of the unused absorption solutions (before sampling) as well as the exposed
absorption solutions containing the absorbed elements (samples) shall be made of PE. The caps shall be
made of PTFE, PFA, FEP, PP, or uncoloured PE.
WARNING Using the storage bottles with absorption solution see warning of 8.2.3.
5.1.3 Apparatus for analysis
5.1.3.1 Digestion device
Heating plate or microwave oven for digestion in a closed PTFE vessel at increased temperature and
pressure.
5.1.3.2 Digestion PTFE vessels
Pressure tight PTFE vessels with lids to be used for sample digestion at increased temperature and
pressure, matching the digestion device, capacity e.g. 100 ml to 200 ml.
5.1.3.3 Measuring cylinders
For the unused and exposed absorption solutions, the capacity will depend on their application, e.g. 50 ml,
100 ml, and 1 000 ml. The flasks are to be made of borosilicate glass, quartz glass, or PE.
5.1.3.4 Volumetric flasks
For the preparation of solutions, the capacity will depend on their application, e.g. 20 ml, 50 ml, 100 ml
and 1 000 ml. They are to be made of borosilicate glass, quartz glass, or PE.
5.1.3.5 Storage flasks
For the digestion solutions, the capacity will depend on their application, e.g. 50 ml, 100 ml and 1 000 ml.
Again, they are to be made of borosilicate glass, quartz glass, or PE.
5.1.3.6 Pipettes and dispensers
These are to be made of borosilicate glass, quartz glass, or PE.
5.2 Chemicals and filter material
5.2.1 General
Only reagents of recognized analytical grades are to be used. All these materials are to have a suitable
content of the elements to be determined to enable the field blank criteria to be met (8.5).
WARNING The user should ensure that all reagents are used in accordance with the appropriate
health and safety regulations. Risk assessment on the overall analytical protocol is required which will
include COSHH (Control of Substances Hazardous to Health) assessments for all the reagents used.
Particular attention should be made to the use of hydrofluoric acid (HF) and the need to develop a specific
“safe working” protocol to address the unique safety issues relating to HF in the laboratory.
5.2.2 Filter
For any series of tests, use only filters from one batch, these should have a low and constant metal content.
The filter material shall have a blank value for each of the elements (per cubic metre of sampled flue gas
anticipated) of less than 1 µg/m or such that the field blank criteria (8.5) can be met. Only plane filters
made of quartz fibre or PTFE shall be used. For the filter efficiency, the same specifications as in
EN 13284-1 are required. This efficiency shall be certified by the supplier. The filter material shall be
suitable for application up to the maximum temperature anticipated.
When using filters with organic binders, precautions shall be taken to ensure that during digestion all
sampled elements attached to the filter material will be digested. The organic binders or the reaction
products from these binders after digestion shall not influence the analysis.
NOTE 1 Generally, the use of filters with organic binders is not recommended.
NOTE 2 For long-term sampling (greater than 24 h) other filters could be considered as long as they allow the
field blank criteria (8.5) to be met.
5.2.3 Hydrofluoric acid
HF; mass concentration w ≈ 40 % (w/w), ρ = 1,16 kg/l, for filter digestion.
5.2.4 Hydrogen peroxide
H O ; mass concentration w ≈ 30 % (w/w), ρ = 1,11 kg/l.
2 2
5.2.5 Nitric acid
HNO ; mass concentration w ≈ 65 % (w/w), ρ = 1,40 kg/l, for filter digestion.
5.2.6 Hydrochloric acid
HCl; mass concentration w ≈ 35 % (w/w), ρ = 1,18 kg/l.
5.2.7 Water
−1
H O; doubly distilled or of the same quality, specific conductivity ρ < 10 µSm (i.e. specific resistance
κ > 0,1 MWm).
5.2.8 Absorption solution
Prepare a mixture of equal volumes of nitric acid (5.2.5) and hydrogen peroxide (5.2.4), pour one volume
of this mixture into nine volume parts of water (5.2.7). This results in mass contents w(HNO ) ≈ 4,4 %
and w(H O ) ≈ 1,6 %. As hydrogen peroxide tends to decompose with time this solution should be
2 2
prepared freshly on site. Keep a portion of the solution for analysis as a blank which is equivalent to the
absorption solution used at site.
NOTE Alternatively, the nitric acid solution can be prepared in advance and the hydrogen peroxide added
on site so avoiding the decomposition issue.
5.2.9 Boric acid solution (H3BO3)
To obtain a cold saturated boric acid solution with a mass content w ≈ 5 % (m/v), dissolve an excess of
boric acid (≈ 50-55 g) in 1 000 ml warm water (5.2.7) and let the solution cool to room temperature.
The supernatant liquid needs to be filtered or decanted for use.
5.2.10 Digestion Solution
To be obtained as follows: Add 200 ml of saturated H BO (5.2.9), 30 ml of HNO (5.2.5) and 20 ml HF
3 3 3
(5.2.3) to a volumetric flask with approximately 700 ml of water (5.2.7). Make up to 1 000 ml with water
(5.2.7) and mix well. Transfer the mixture to a 1 000 ml storage bottle. Label it “digestion solution” and
add any other relevant information (date, etc.). Take approx. 50-100 ml of this solution into a further
storage bottle and label it “digestion blank” along with any other relevant information (date, etc.)
The digestion solution shall be used as blank for all digestions by using acids from one batch.
Furthermore, this chemical digestion solution shall be used for dilution of laboratory standards (3.1.3
and 8.7.3).
5.2.11 Rinsing acid
HNO , mass content w ≈ 5 %, for rinsing the digestion equipment. Add 80 ml of HNO (5.2.5) carefully
3 3
to 300 ml of water (5.2.7) and make up to 1 000 ml with water (5.2.7).
NOTE Alternatively the absorption solution can be used for rinsing the sampling train.
5.2.12 Standard solutions
These are to contain the specific elements to be determined with C(element) = 1 g/l; pH ≤ 1.
Use commercially available standard solutions and dilute them to the appropriate concentrations.
5.2.13 Certified reference material
Commercially available certified reference material (CRM), e.g. pulverized fly ash (BCR 038), shall be
used.
5.2.14 Acetone
If acetone is used for pre-washing the nozzle and probe it shall be chosen such that it does not contribute
to the overall analysis and such that the field blank criteria (8.5) can be met. This requires that high
analytical grade acetone is used with low suspended and low residues on evaporation. The content of
specific metals of Groups A and B metals (6.3) will need to be as low as possible. However, the specific
levels will be dependent on the expected sample gas volume in a campaign.
The highest grade of analytical reagent is recommended with respect to metal content and will need
verifying to ensure that the field blank criteria (8.5) can be met.
6 Sampling equipment
6.1 General requirements
The sampling equipment consists of:
— sampling probe with an entry nozzle suitable for isokinetic sampling conforming to the requirements
specified in EN 13284-1;
— a filter housing with filter support and filter;
— the filter housing may be located either:
— in the duct, mounted directly behind the entry nozzle (in-stack filtration); or
— outside the duct, mounted directly behind the suction tube (out-stack filtration).
In the latter case (out-stack filtration) the filter housing shall be temperature controlled.
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