EN 15936:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.ORWQHJDSchlamm, behandelter Bioabfall, Boden und Abfall - Bestimmung des gesamten organischen Kohlenstoffs (TOC) mittels trockener VerbrennungBoue, biodéchet traité, sol et déchets - Détermination de la teneur en carbone organique total (COT) par combustion sècheSludge, treated biowaste, soil and waste - Determination of total organic carbon (TOC) by dry combustion13.030.20Liquid wastes. SludgeICS:Ta slovenski standard je istoveten z:EN 15936:2012SIST EN 15936:2012en,fr,de01-december-2012SIST EN 15936:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15936
August 2012 ICS 13.030.01 English Version
Sludge, treated biowaste, soil and waste - Determination of total organic carbon (TOC) by dry combustion
Boues, bio-déchets traités, sols et déchets - Détermination de la teneur en carbone organique total (COT) par combustion sèche
Schlamm, behandelter Bioabfall, Boden und Abfall - Bestimmung des gesamten organischen Kohlenstoffs (TOC) mittels trockener Verbrennung This European Standard was approved by CEN on 24 May 2012.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15936:2012: ESIST EN 15936:2012

Repeatability and reproducibility data . 14Annex B (informative)
Factors influencing dry combustion methods . 17Annex C (informative)
Determination of total organic carbon (TOC) in solid samples using the suspension method . 20Bibliography . 24 SIST EN 15936:2012

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Agricultural soil Waste Filter cake, Bottom ash, Electro-plating sludge, Dredged sludge, Rubble
WARNING — Persons using this European Standard should be familiar with usual laboratory practice. This European Standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. IMPORTANT — It is absolutely essential that tests conducted according to this European Standard be carried out by suitably trained staff. SIST EN 15936:2012

3.2 total inorganic carbon TIC quantity of carbon that is liberated as carbon dioxide by acid treatment 3.3 total organic carbon TOC quantity of carbon that is converted into carbon dioxide by combustion and which is not liberated as carbon dioxide by acid treatment 4 Principle 4.1 Method A (indirect procedure) In this procedure, the TOC is obtained by the difference between the results of the measurements of TC and TIC. The total carbon (TC) present in the sample is converted to carbon dioxide by combustion in an oxygen-containing gas flow free of carbon dioxide. To ensure complete combustion, catalysts and/or modifiers can be used. The released amount of carbon dioxide is measured by infrared spectrometry, thermal conductivity detection, flame ionisation detection after reduction to methane, or by gravimetry, coulometry, conductometry after absorption. SIST EN 15936:2012

The carbon dioxide released during the analysis is measured using one of the detection methods infrared spectrometry, gravimetry, coulometry, conductometry, thermal conductivity detection, flame ionisation detection after reduction to methane, or other suitable techniques, and is expressed as carbon. 9.1.3 Determination of the TIC The sample prepared according to Clause 8 is weighed into the purging unit (7.3). The system is closed gas-tight and flushed with carrier gas until no more carbon dioxide from ambient air is present. Then acid (6.12) is added and the carbon dioxide is stripped by purging or stirring and/or heating. The released carbon dioxide is transferred to the detector by the carrier gas. SIST EN 15936:2012

Samples containing persistent carbonates (e.g. concrete, cement) require treatment with hot acid for complete release of carbon dioxide. 9.2 Calibration If a relative method is used for detection, e.g. infrared detection, calibration is necessary. Examples of calibration substances suitable for TC are calcium carbonate (6.1), potassium hydrogen phthalate (6.4), acetanilide (6.5), atropine (6.6), spectrographic graphite powder (6.7).
Sodium carbonate (6.2) and Na4-EDTA (6.3) as well as all compounds with EDTA-structure shall not be used for TC-calibration as they are used as control substances. Sodium carbonate (6.2) or calcium carbonate (6.1) are suitable for the calibration of TIC. Other calibration substances may be used provided their suitability is checked. The following procedure should be applied for calibration:  Establish the preliminary working range.  Measure a minimum of five standard samples. The concentration of these standard samples shall be distributed evenly over the working range.  Calculate mean values for each concentration.  Carry out a linear regression analysis with the mean values and test the linearity of the calibration function (see also ISO 8466-1). The function shall be linear. Otherwise the working range shall be restricted to the linear range. If an absolute method is used for detection, e.g. coulometry, only control measurements according to 9.3 shall be carried out. This calibration should be carried out for initial validation purposes or after major changes of the equipment. 9.3 Control measurements Control measurements should be carried out using control mixture A (6.10) for the procedures according to 9.1.2. (TC) and 9.1.3 (TIC). Analysis of one concentration from the middle of the respective working range, possibly repeated two or three times, is sufficient. For the TC and TIC the mean recovery shall be between 90 % and 110 % with a coefficient of variation ≤ 5 %. Blank values shall be taken into account if necessary. If the required recoveries are not achieved, the following measures may be helpful. For TC analysis: SIST EN 15936:2012

is the TOC content as carbon in the sample expressed in grams per kilogram (g/kg); w
is the water content of the sample as mass fraction expressed in percent (%). The TOC content is reported as carbon on a dry matter basis. According to Formula (3) results are obtained in grams per kilogram (g/kg), but other units may be used.
10 Procedure Method B (direct method) 10.1 Determination 10.1.1 General The mass of the test portion should be as large as possible and shall be chosen so that the liberated quantity of carbon dioxide lies within the working range of the equipment/calibration. 10.1.2 Removal of the inorganic carbon and determination of the TOC The sample prepared according to Clause 8 is weighed into a suitable vessel (7.4). The vessel may be prepared by thermal treatment (in a muffle furnace or the combustion apparatus itself) to minimize carbon blank values. In order to remove the inorganic carbon prior to the determination
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