EN 14672:2005

SLOVENSKI STANDARD
01-december-2005
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Characterization of sludges - Determination of total phosphorus
Charakterisierung von Schlämmen - Bestimmung von Gesamtphosphor
Caractérisation des boues - Dosage du phosphore total
Ta slovenski standard je istoveten z: EN 14672:2005
ICS:
13.030.20 7HNRþLRGSDGNL%ODWR Liquid wastes. Sludge
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14672
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 13.030.20
English version
Characterization of sludges - Determination of total phosphorus
Caractérisation des boues - Dosage du phosphore total Charakterisierung von Schlämmen - Bestimmung von
Gesamtphosphor
This European Standard was approved by CEN on 27 June 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, 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
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14672:2005: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions.4
4 Principle.5
5 Limitations and interferences .5
6 Hazards.5
7 Apparatus .5
8 Reagents.6
9 Sample pre-treatment .6
10 Procedure .6
11 Expression of results.7
12 Test report .8

Annex A (informative) Performance data of interlaboratory comparison .9

Foreword
This European Standard (EN 14672:2005) has been prepared by Technical Committee CEN/TC 308
“Characterization of sludges”, the secretariat of which is held by AFNOR.
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 February 2006, and conflicting national standards shall be withdrawn
at the latest by February 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This European Standard specifies a procedure for complete digestion of raw/digested sludge, suitable for the
subsequent determination of phosphorus.
NOTE Phosphorus in environmental samples can be present in many forms. This method of pre-treatment enables
the analyst to determine all forms - i.e. total phosphorus, by quantitative oxidation yielding an aqueous solution of
orthophosphate which should be analysed for phosphate according to method EN ISO 6878, EN ISO 10304-2 or an
equivalent validated method.
The range of the method is up to 50 g/kg P assuming appropriate dilution of the digest in the final
measurement step.
2 Normative references
The following referenced documents are indispensable for the application 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 12880:2000, Characterization of sludges — Determination of dry residue and water content
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987)
EN ISO 6878, Water quality — Determination of phosphorus — Ammonium molybdat spectrometric method
(ISO 6878:2004)
EN ISO 10304-2, Water quality — Determination of dissolved anions by liquid chromatography of ions —
Part 2: Determination of bromide, chloride, nitrate, nitrite, orthophosphate and sulfate in waste water
(ISO 10304-2:1995)
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
total phosphorus
phosphorus converted to orthophosphate by oxidation.
NOTE This includes condensed phosphates (e.g. pyro and polyphosphates), organophosphorus (e.g. phosphate
esters and aminophosphonic acids) and free phosphates
3.2
dry residue
dry mass portion of the sludge obtained after the specified drying process. It is expressed as percent
[EN 12880:2000, 3.1]
3.3
dry mass (dry matter)
mass of solid obtained after the specified drying process. It is expressed as grams or kilograms
[EN 12880:2000, 3.3]
4 Principle
A boiling mixture of sulfuric and nitric acids oxidises organic matter, releasing any phosphorus present and
converting it to orthophosphate. As the mixture boils, nitric acid is lost due to the oxidation process and due to
distillation. As the proportion of nitric acid decreases, the
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