SIST-TR CEN/TR 14823:2004

SLOVENSKI STANDARD
SIST-TR CEN/TR 14823:2004
01-januar-2004
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Durability of wood and wood-based products - Quantitative determination of
pentachlorophenol in wood - Gas chromatographic method
Dauerhaftigkeit von Holz und Holzprodukten - Quantitative Bestimmung von
Pentachlorphenol in Holz - Gaschromatographische Verfahren
Durabilité du bois et des matériaux dérivés du bois - Analyse quantitative du
pentachlorophénol dans le bois - Méthode par chromatographie en phase gazeuse
Ta slovenski standard je istoveten z: CEN/TR 14823:2003
ICS:
79.040 Les, hlodovina in žagan les Wood, sawlogs and sawn
timber
SIST-TR CEN/TR 14823:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TR CEN/TR 14823:2004

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SIST-TR CEN/TR 14823:2004
TECHNICAL REPORT
CEN/TR 14823
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
September 2003
ICS 71.100.50; 79.040
English version
Durability of wood and wood-based products – Quantitative
determination of pentachlorophenol in wood – Gas
chromatographic method
Durabilité du bois et des matériaux dérivés du bois – Dauerhaftigkeit von Holz und Holzprodukten – Quantitative
Analyse quantitative du pentachlorophénol dans le bois – Bestimmung von Pentachlorphenol in Holz –
Méthode par chromatographie en phase gazeuse Gaschromatographische Verfahren
This Technical Report was approved by CEN on 27 July 2003. It has been drawn up by the Technical Committee CEN/TC 38.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 14823:2003 E
worldwide for CEN national Members.

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Contents
Page
Foreword.3
Introduction .4
1 Scope .5
2 References.5
3 Safety precautions.5
4 Principle.5
5 Reagents.5
6 Apparatus .6
7 Preparation of the test sample .7
8 Procedure .7
8.1 General.7
8.2 Standard solutions .7
8.3 Preparation of the calibration solutions.8
8.4 Determination.8
9 Calculation and expression of results.10
10 Quality assurance .11
11 Precision.11
12 Test report .11
Annex A Ring test results .12
Bibliography .13
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Foreword
This document (CEN/TR 14823:2003) has been prepared by Technical Committee CEN/TC 38 “Durability of wood
and wood-based products”, the secretariat of which is held by AFNOR.
This status of this document as Technical Report has been chosen because this method described is an example
of a laboratory method validated by a ring test. It is recognized that, for example, different techniques of extraction
might be employed by the analyst without loss of analytical performance and quality. However, when using different
techniques the comparability to the method described in this Technical Report should be demonstrated, e.g. by
using a certified reference material (CRM).
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Introduction
At present, no standardised method for the analysis of pentachlorophenol (PCP) in wood is recognized in Europe.
Only a few national standards are available world wide, e g BS 5666, Part 6 and AWPA Standard A-5 and these
methods are designed for the analysis of timber treated with levels of PCP that are necessary to prevent
degradation of the treated timber by fungi.
This Technical Report has been issued in order to facilitate the analysis of PCP-treated wood and panels and in
particular low levels of PCP that can be present in packaging timbers and pallets. Low levels of PCP and other
chlorophenols, and the anisoles derived from them, can cause taints in foodstuffs. PCP can be present as residues
from old anti-sapstain treatment or some timber treated against decay could inadvertently have been incorporated
into the panel product.
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1 Scope
This Technical Report specifies a laboratory method of determining the pentachlorophenol content of wood. The
method is applicable to all types of PCP- treated wood and wood-based materials as well as for the analysis of
waste timber with respect to its PCP content.
The method has a quantification limit corresponding to 100 μg PCP per kilogram of wood material expressed as dry
matter. The method described has a measurement range up to PCP contents of 25 mg/kg of dry matter. These
figures refer to the given example (where an aliquot of 1 ml of the extract is used for acetylation, see 8.4).
NOTE 1 If lower quantification limits are required, a higher volume of extract aliquot can be used for derivatisation.
NOTE 2 This method could have some modifications with some wood species as hardwoods.
2 References
EN 212, Wood preservatives - General guidance on sampling and preparation for analysis of wood preservatives
and treated timber.
EN 322, Wood-based panels – Determination of moisture content.
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987).
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the
determination of repeatability and reproducibility of a standard measurement method.
ISO 11465, Soil quality - Determination of dry matter and water content on a mass basis - Gravimetric method.
3 Safety precautions
Persons using this method should be familiar with normal analytical laboratory procedures and practice.
This method does not purport to address all the safety problems, if any, associated with its use.
It is the responsibility of the user to establish safety and health practices and to ensure compliance with any
European or national regulatory conditions.
4 Principle
Pentachlorophenol is extracted from the wood material using methanol. The extracted pentachlorophenol is
transformed to pentachlorophenol acetate by derivatisation of an aliquot of the extract in aqueous potassium
carbonate solution with acetic anhydride. The acetate derivative formed is extracted from this aqueous solution with
n-hexane and analysed by gas chromatography with electron capture detection.
5 Reagents
During the analysis, unless otherwise specified, use only reagents of recognized analytical grade which have been
checked in advance as to not interfere with the analytical results, and water complying with grade 3 as defined in
EN ISO 3696.
5.1 Acetic anhydride (C H O ).
4 6 3
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5.2 Methanol (CH OH).
3
NOTE Other solvents can be used instead of methanol, some extraction difficulties can occur with some wood species
(e.g. hardwoods). It is recommended to cross check the extraction efficiency of any other solvent or solvent mixture with that of
methanol.
5.3 n-Hexane (C H ).
6 14
5.4 Potassium carbonate, solution, c(K CO ) = 0,1 mol/l.
3
5.5 Sodium sulfate, anhydrous (Na SO ).
2 4
1)
5.6 Pentachlorophenol (PCP, (C Cl OH)) of certified purity (> 99%), e.g. IPO 560 .
6 5
5.7 2,4,6-tribromophenol (TBP, (C H Br OH)) of certified purity (> 98%) as an internal standard.
6 2 3
5.8 Purified sand, (ignited at 900 °C after acid treatment)
NOTE An untreated wood sample (of the same wood species as the sample for analysis) known to be free of
pentachlorophenol can also be used instead of purified sand but before use it should be checked for interference with the
analytical method.
6 Apparatus
Ordinary laboratory apparatus and the following.
NOTE Glassware should be thoroughly cleaned prior to use.
6.1 Analytical balance, accurate to 0,01 mg.
6.2 Ultra-sonic bath equipped with a thermostat capable of controlling and maintaining a temperature of 40 °C.
6.3 Disposable Pasteur pipettes made of glass, 2,0 ml capacity.
6.4 Separating funnel, 150 ml capacity.
6.5 Volumetric pipettes, 1,0 ml and 10 ml or 20 ml capacity.
6.6 Microlitre syringes, 25 μl, 100 μl and 500 μl capacity.
6.7 Volumetric flasks, 10 ml, 25 ml and 50 ml capacity.
6.8 Conical flasks 100 ml capacity, with screw caps provided with an insert of polytetrafluoroethylene (PTFE) or
alternatively with standard ground stoppers provided with PTFE standard ground sockets and conical joint clips.
6.9 Gas chromatograph equipped with a splitless/split or a non-discriminating injection system and an electron
capture detector (ECD)
6.10 Separation column. One capillary column, or preferably two, with stationary phase of different polarity e.g.
2)
DB 1, DB 5, DB 17 ; length: 25 m to 30 m; internal diameter: 0,2 mm to 0,32 mm; film thickness: 0,25 μm to 0,33
μm.

1) IPO 560 is an example of a suitable product available commercially, supplied by Promochem. This information is given for
the convenience of users of this CEN Technical Report and does not constitute and endorsement by CEN of this product.
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6.11 Pre-column coated with deactivated silica.
7 Preparation of the test sample
Collect at least 10 g of the sample material taken according to e.g. EN 212. This sample material is preferably
ground under mild conditions (e.g. cryogenic grinding) to chips with an approximate particle size of 0,5 mm to 1,0
mm diameter.
NOTE 1 Wood shavings can also be made for analysis (especially if other compounds e.g. trichlorophenols or
trichloroanisols have to be analysed at the same time).
Homogenise the ground sample material to obtain a representative sample, and store it in a brown glass vessel
with screw caps with a PTFE insert. This is the test sample.
NOTE 2 If possible, the sample for analysis should be prepared from a minimum of five independent pieces or sections
representatively taken from the quantity of wood material to be analysed.
8 Procedure
8.1 General
It is recommended to carry out at least two parallel analyses. If results differ by more than 10 % an additional
analysis shall be carried out.
8.2 Standard solutions
8.2.1 Preparation of stock solutions (calibrant and internal standard)
Prepare the stock solutions by weighing about 12,5 mg of PCP (5.6) and TBP (5.7) separately to the nearest of
0,01 mg and dissolve each in 25 ml methanol (5.2).
NOTE These stock solutions with nominal concentrations of 0,5 mg/ml can be stored in the dark at –18 °C for three
months.
8.2.2 Preparation of working solutions
Transfer by pipette (6.5) 1,00 ml of stock PCP solution (8.2.1) to a 10 ml one-mark volumetric flask and make up to
the mark with methanol (5.2) to give
...