SIST EN 14671:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Characterization of sludges - Pre-treatment for the determination of extractable ammonia using 2 mol/l potassium chlorideCaractérisation des boues - Prétraitement pour le dosage de l'azote ammoniacal extractible par une solution de chlorure de potassium a 2 mol/lCharakterisierung von Schlämmen - Vorbehandlung zur Bestimmung des extrahierbaren Ammoniums unter Verwendung von 2 mol/l KaliumchloridTa slovenski standard je istoveten z:EN 14671:2006SIST EN 14671:2006en,fr,de13.030.20ICS:SLOVENSKI
STANDARDSIST EN 14671:200601-september-2006







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14671June 2006ICS 13.030.20 English VersionCharacterization of sludges - Pre-treatment for the determinationof extractable ammonia using 2 mol/l potassium chlorideCaractérisation des boues - Prétraitement pour ladétermination de l'Azote ammoniacal extractible utilisant2mol/l de chlorure de potassiumCharakterisierung
von Schlämmen - Vorbehandlung zurBestimmung des extrahierbaren Ammoniums unterVerwendung von 2 mol/l KaliumchloridThis European Standard was approved by CEN on 24 May 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14671:2006: E



EN 14671:2006 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.5 4 Principle.5 5 Limitations and interferences.5 6 Hazards.6 7 Reagents.6 8 Apparatus.6 9 Sample pre-treatment.7 10 Procedure.7 11 Expression of results.8 12 Test report.8 Annex A (informative)
Performance data of the interlaboratory comparison — Summary of sludge exchangeable ammonia results.9 Bibliography.11



EN 14671:2006 (E) 3 Foreword This document (EN 14671:2006) 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 December 2006, and conflicting national standards shall be withdrawn at the latest by December 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.



EN 14671:2006 (E) 4 Introduction Because sludge may be applied to land as manure or as a disposal, there is a need to monitor extractable ammonia.



EN 14671:2006 (E) 5 1 Scope This European standard specifies a procedure for the determination of extractable ammonia using a 2 mol/l potassium chloride solution in raw and digested sewage sludges. The range of the method is up to 100 g/kg N assuming appropriate dilution of the potassium chloride extract in the final measurement step. NOTE The above wording will be modified once the round robin results are available. It may be suitable for other types of sludges, but the user should validate the method using these sludges. 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 3696:1995, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 extractable ammonia ammonia that is released when the homogenised sludge is shaken with 2 mol/l potassium chloride for 1 h at room temperature 3.2 dry residue dry mass portion of the sludge obtained after the specified drying process, expressed as a percentage [EN 12880:2000, 3.1] 4 Principle An aliquot of the homogenised sludge is shaken for 1 h with 2 mol/l potassium chloride at room temperature. The sample is then filtered and the ammonia determined by a suitable method. Potassium chloride (2 mol/l) is used rather than water to ensure that both soluble and ion exchangeable forms of the determinand are determined. It also minimises biological activity in the extracted sample. All results are expressed as nitrogen. Although undried samples are taken for analysis, it is recognised practice to report results on a dry weight basis. Consequently the dry residue content of the homogenised sample used for analysis should also be determined using a separate test portion (see EN 12880). 5 Limitations and interferences Substances present at their normal concentration in these types of samples should not cause significant interference in the pre-extraction step. For the vast majority of sewage sludges, the relatively high concentration of ammonia compared with potential interferences should not result in any significant



EN 14671:2006 (E) 6 interferences in the final measurement stage. The user should carry out suitable recovery checks to confirm this. 6 Hazards 6.1 General Waste and sludge samples may contain hazardous and inflammable substances. They may contain pathogens and be liable for biological action. Consequently it is recommended that these samples should be handled with special care. The gases, which may be produced by mic
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