Characterization of sludges - Determination of Kjeldahl nitrogen

This method describes a procedure for the determination of "Kjeldahl Nitrogen" in sludge and sludge products. The digestion is catalysed by selenium or copper, the temperature being raised by a high concentration of sodium sulphate. Although wet samples are normally taken for analysis, it is recognised practice to report results on a dry mass basis (g/kg). Consequently, it is also necessary to determine the dry residue of the homogenised sample used for analysis (see EN 12880).

Charakterisierung von Schlämmen - Bestimmung des Stickstoffs nach Kjeldahl

Diese Norm legt ein Verfahren zur Bestimmung des "Stickstoffs nach Kjeldahl" in Schlamm und Schlammprodukten fest. Der Aufschluß wird durch Selen oder Kupfer katalysiert; durch eine hohe Konzentration an Natriumsulfat wird die Aufschlußtemperatur erhöht. Obwohl zur Analyse üblicherweise Naßproben entnommen werden, ist es anerkannte Praxis, die Ergebnisse auf Trockenmasse bezogen anzugeben. Demzufolge muß ebenfalls der Trockenmassenanteil der zur Analyse verwendeten homogenisierten Probe bestimmt werden (siehe EN 12880).

Caractérisation des boues - Détermination de l'azote Kjeldahl

La présente méthode décrit une méthode de détermination de "l'azote Kjeldahl" dans les boues et produits dérivés. La minéralisation catalysée par du sélénium ou du cuivre est réalisée à une température élevée grâce à l'emploi de sulfate de sodium en concentration importante. Bien que les échantillons à analyser soient normalement prélevés à l'état humide, il est d'usage d'exprimer les résultats par rapport à la matière sèche en grammes par kilogramme, d'où la nécessité de déterminer également la teneur en matières sèches de l'échantillon utilisé pour l'analyse après homogénéisation (voir EN 12880).

Karakterizacija blata - Določevanje dušika po Kjeldahlu

General Information

Status
Published
Publication Date
30-Nov-2001
ICS
13.030.20 - Liquid wastes. Sludge
Technical Committee
KAT - Soil quality
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Dec-2001
Due Date
01-Dec-2001
Completion Date
01-Dec-2001
Ref Project
EN 13342:2000 - Characterization of sludges - Determination of Kjeldahl nitrogen

Overview

EN 13342:2000 (CEN) specifies a laboratory method for the determination of Kjeldahl nitrogen in sludges and sludge products. The standard defines a digestion procedure in which the decomposition is catalysed by selenium or copper and the digestion temperature is raised using a high concentration of sodium sulphate. Although analyses are normally run on wet samples, results are conventionally reported on a dry mass basis (g/kg); therefore the dry residue of the homogenised sample used for analysis must also be determined (see EN 12880).

Key topics and requirements

  • Scope: Procedure applies to sludges and sludge products for quantifying Kjeldahl nitrogen.
  • Digestion catalysts: Use of selenium or copper as catalysts in the digestion step is specified.
  • Temperature control: Temperature elevation is achieved by adding a high concentration of sodium sulphate to the digestion mixture.
  • Sample basis: Samples are typically taken wet but results should be reported on a dry mass basis (g/kg).
  • Dry residue determination: The dry residue of the homogenised sample used in analysis must be determined in accordance with EN 12880 to allow correct reporting on a dry mass basis.
  • Documentation and traceability: Follow standard laboratory practices for sample homogenisation, documentation and reporting to ensure comparable, reproducible results (as implicit in CEN standardization practice).

Applications

EN 13342:2000 is used where accurate measurement of Kjeldahl nitrogen in sludge is required for environmental management, process control and regulatory compliance. Typical users include:

  • Wastewater treatment laboratories performing sludge characterization
  • Municipal and industrial sludge management facilities monitoring nutrient content
  • Environmental consultants and laboratories conducting analyses for permit compliance
  • Regulatory agencies and auditors assessing sludge quality and reporting
  • Research institutions studying sludge composition and treatment performance

Reporting results on a dry mass basis (g/kg) supports consistent comparisons between samples and across treatment processes.

Related standards

  • EN 12880 - Determination of dry residue of the homogenised sample (referenced by EN 13342:2000)
  • Other CEN/ISO standards and national methods for sludge and wastewater analysis may be used alongside EN 13342 for comprehensive sludge characterization.

Keywords: EN 13342:2000, Kjeldahl nitrogen in sludge, characterization of sludges, CEN standard, sodium sulphate digestion, selenium catalyst, copper catalyst, dry mass basis (g/kg), EN 12880.

Frequently Asked Questions

SIST EN 13342:2001 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Characterization of sludges - Determination of Kjeldahl nitrogen". This standard covers: This method describes a procedure for the determination of "Kjeldahl Nitrogen" in sludge and sludge products. The digestion is catalysed by selenium or copper, the temperature being raised by a high concentration of sodium sulphate. Although wet samples are normally taken for analysis, it is recognised practice to report results on a dry mass basis (g/kg). Consequently, it is also necessary to determine the dry residue of the homogenised sample used for analysis (see EN 12880).

This method describes a procedure for the determination of "Kjeldahl Nitrogen" in sludge and sludge products. The digestion is catalysed by selenium or copper, the temperature being raised by a high concentration of sodium sulphate. Although wet samples are normally taken for analysis, it is recognised practice to report results on a dry mass basis (g/kg). Consequently, it is also necessary to determine the dry residue of the homogenised sample used for analysis (see EN 12880).

SIST EN 13342:2001 is classified under the following ICS (International Classification for Standards) categories: 13.030.20 - Liquid wastes. Sludge. The ICS classification helps identify the subject area and facilitates finding related standards.

You can purchase SIST EN 13342:2001 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Charakterisierung von Schlämmen - Bestimmung des Stickstoffs nach KjeldahlCaractérisation des boues - Détermination de l'azote KjeldahlCharacterization of sludges - Determination of Kjeldahl nitrogen13.030.20Liquid wastes. SludgeICS:Ta slovenski standard
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