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  • EN ISO 5961 : 1995

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    WATER QUALITY - DETERMINATION OF CADMIUM BY ATOMIC ABSORPTION SPECTROMETRY (ISO 5961:1994)

    Available format(s): 

    Language(s): 

    Published date:  27-03-1995

    Publisher:  Comite Europeen de Normalisation

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    SECTION 1: GENERAL
    1.1 Scope
    1.2 Normative reference
    SECTION 2: DETERMINATION OF CADMIUM USING ATOMIC
               ABSORPTION SPECTROMETRY IN AIR-ACETYLENE FLAME
    2.1 Interferences
    2.2 Principle
    2.3 Reagents
    2.4 Apparatus
    2.5 Sampling and sample pretreatment
    2.6 Procedure
    2.7 Evaluation
    2.8 Test report
    2.9 Precision
    SECTION 3: DETERMINATION OF CADMIUM BY ELECTROTHERMAL
               ATOMIZATION ATOMIC ABSORPTION SPECTROMETRY
    3.1 Interferences
    3.2 Principle
    3.3 Reagents
    3.4 Apparatus
    3.5 Sampling and sample pretreatment
    3.6 Procedure
    3.7 Determination
    3.8 Expression of results
    3.9 Test report
    3.10 Precision
    Annex A (informative) Bibliography

    Abstract - (Show below) - (Hide below)

    Specifies two methods for the determination of cadmium: using atomic absorption spectrometry (AAS) in an air-acetylene flame (aspiration of the acidified sample into the flame and measurement of the cadmium concentration at a wavelength of 228,8 nm) and by electrothermal atomization AAS (injection of the acidified sample into an electrically heated graphite tube of an electrothermal atomization atomic absorption spectrometer and measurement of the absorbance at a wavelength of 228,8 nm).

    General Product Information - (Show below) - (Hide below)

    Committee TC 230
    Document Type Standard
    Publisher Comite Europeen de Normalisation
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    UNE-EN 15041:2015 Chemicals used for treatment of water intended for human consumption - Antiscalants for membranes - Polyphosphates
    DIN EN 15039 E : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYCARBOXILIC ACIDS AND SALTS
    BS EN 15039:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYCARBOXILIC ACIDS AND SALTS
    UNI EN 16174 : 2012 SLUDGE, TREATED BIOWASTE AND SOIL - DIGESTION OF AQUA REGIA SOLUBLE FRACTIONS OF ELEMENTS
    UNI EN 15039 : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYCARBOXILIC ACIDS AND SALTS
    BS EN 1201:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - POTASSIUM DIHYDROGEN ORTHOPHOSPHATE
    BS EN 1200:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TRISODIUM ORTHOPHOSPHATE
    BS EN 1203:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TRIPOTASSIUM ORTHOPHOSPHATE
    BS EN 1210:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM TRIPOLYPHOSPHATE
    I.S. EN 1202:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DIPOTASSIUM HYDROGEN ORTHOPHOSPHATE
    EN 1201 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - POTASSIUM DIHYDROGEN ORTHOPHOSPHATE
    EN 1208 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM CALCIUM POLYPHOSPHATE
    EN 1207 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TETRAPOTASSIUM PYROPHOSPHATE
    EN 1212 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM POLYPHOSPHATE
    EN 1198 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM DIHYDROGEN ORTHOPHOSPHATE
    EN 1204 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - CALCIUM TETRAHYDROGEN BIS(ORTHOPHOSPHATE)
    EN 1199 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM HYDROGEN ORTHOPHOSPHATE
    EN 1202 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DIPOTASSIUM HYDROGEN ORTHOPHOSPATE
    EN 1205 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM DIHYDROGEN PYROPHOSPHATE
    EN 13346 : 2000 CHARACTERIZATION OF SLUDGES - DETERMINATION OF TRACE ELEMENTS AND PHOSPHORUS - AQUA REGIA EXTRACTION METHODS
    EN 1210 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM TRIPOLYPHOSPHATE
    EN 12879 : 2000 CHARACTERIZATION OF SLUDGES - DETERMINATION OF THE LOSS ON IGNITION OF DRY MASS
    EN 1206 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TETRASODIUM PYROPHOSPHATE
    BS EN 16174:2012 Sludge, treated biowaste and soil. Digestion of aqua regia soluble fractions of elements
    05/30135475 DC : DRAFT JUNE 2005
    BS EN 62321-5:2014 Determination of certain substances in electrotechnical products Cadmium, lead and chromium in polymers and electronics and cadmium and lead in metals by AAS, AFS, ICP-OES and ICP-MS
    DIN EN 15040:2014-06 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - PHOSPHONIC ACIDS AND SALTS
    UNE-EN 15039:2014 Chemicals used for treatment of water intended for human consumption - Antiscalants for membranes - Polycarboxilic acids and salts
    UNE-EN 15040:2015 Chemicals used for treatment of water intended for human consumption - Antiscalants for membranes - Phosphonic acids and salts
    I.S. EN 15030:2012 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    I.S. EN 15039:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYCARBOXILIC ACIDS AND SALTS
    I.S. EN 16174:2012 SLUDGE, TREATED BIOWASTE AND SOIL - DIGESTION OF AQUA REGIA SOLUBLE FRACTIONS OF ELEMENTS
    DIN EN 1208:2005-06 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM CALCIUM POLYPHOSPHATE
    DIN EN 1205:2005-06 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM DIHYDROGEN PYROPHOSPHATE
    DIN EN 1201:2005-06 Chemicals used for treatment of water intended for human consumption - Potassium dihydrogen orthophosphate; German version EN 1201:2005
    DIN EN 1212:2005-06 Chemicals used for treatment of water intended for human consumption - Sodium polyphosphate; German version EN 1212:2005
    DIN EN 1207:2005-06 Chemicals used for treatment of water intended for human consumption - Tetrapotassium pyrophosphate; German version EN 1207:2005
    BS EN 1198:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM DIHYDROGEN ORTHOPHOSPHATE
    BS EN 1212:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM POLYPHOSPHATE
    BS EN 1207:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TETRAPOTASSIUM PYROPHOSPHATE
    BS EN 1202:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DIPOTASSIUM HYDROGEN ORTHOPHOSPHATE
    I.S. EN 1203:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TRIPOTASSIUM ORTHOPHOSPHATE
    I.S. EN 1204:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - CALCIUM TETRAHYDROGEN BIS(ORTHOPHOSPHATE)
    I.S. EN 1198:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM DIHYDROGEN ORTHOPHOSPHATE
    I.S. EN 1205:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM DIHYDROGEN PYROPHOSPHATE
    I.S. EN 1197:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - MONOZINC PHOSPHATE SOLUTION
    I.S. EN 1201:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - POTASSIUM DIHYDROGEN ORTHOPHOSPHATE
    I.S. EN 13656:2002 CHARACTERISATION OF WASTE - MICROWAVE ASSISTED DIGESTION WITH HYDROFLUORIC (HF), NITRIC (HNO[3]) AND HYDROCHLORIC (HCI) ACID MIXTURE FOR SUBSEQUENT DETERMINATION OF ELEMENTS
    I.S. EN 1210:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM TRIPOLYPHOSPHATE
    I.S. EN 1208:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM CALCIUM POLYPHOSPHATE
    I.S. EN 1199:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM HYDROGEN ORTHOPHOSPHATE
    I.S. EN 1212:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM POLYPHOSPHATE
    I.S. EN 1211:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - POTASSIUM TRIPOLYPHOSPHATE
    I.S. EN 1200:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TRISODIUM ORTHOPHOSPHATE
    DIN EN 1197:2001-03 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - MONOZINC PHOSPHATE SOLUTION
    I.S. EN 1206:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TETRASODIUM PYROPHOSPHATE
    DIN EN 15041 E : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYPHOSPHATES
    DIN EN 15041:2014-06 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYPHOSPHATES
    I.S. EN 15041:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYPHOSPHATES
    I.S. EN 15040:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - PHOSPHONIC ACIDS AND SALTS
    UNI EN 15041 : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYPHOSPHATES
    PREN 15030 : DRAFT 2012 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    DIN EN 1204:2005-06 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - CALCIUM TETRAHYDROGEN BIS(ORTHOPHOSPHATE)
    DIN EN 1211:2005-06 Chemicals used for treatment of water intended for human consumption - Potassium tripolyphosphate; German version EN 1211:2005
    DIN EN 1210:2005-06 Chemicals used for treatment of water intended for human consumption - Sodium tripolyphosphate; German version EN 1210:2005
    DIN EN 1200:2005-06 Chemicals used for treatment of water intended for human consumption - Trisodium orthophosphate; German version EN 1200:2005
    DIN EN 1197:2014-06 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - MONOZINC PHOSPHATE SOLUTION
    DIN EN 1198:2005-06 Chemicals used for treatment of water intended for human consumption - Sodium dihydrogen orthophosphate; German version EN 1198:2005
    DIN EN 1203:2005-06 Chemicals used for treatment of water intended for human consumption - Tripotassium orthophosphate; German version EN 1203:2005
    DIN EN 1202:2005-06 Chemicals used for treatment of water intended for human consumption - Dipotassium hydrogen orthophosphate; German version EN 1202:2005
    DIN EN 1199:2005-06 Chemicals used for treatment of water intended for human consumption - Disodium hydrogen orthophosphate; German version EN 1199:2005
    EN 13656 : 2002 CHARACTERIZATION OF WASTE - MICROWAVE ASSISTED DIGESTION WITH HYDROFLUORIC (HF), NITRIC (HNO[3]), AND HYDROCHLORIC (HCL) ACID MIXTURE FOR SUBSEQUENT DETERMINATION OF ELEMENTS
    UNI EN 1197 : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - MONOZINC PHOSPHATE SOLUTION
    EN 1200:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TRISODIUM ORTHOPHOSPHATE
    BS EN 15030 : 2012 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    UNI EN 15040 : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - PHOSPHONIC ACIDS AND SALTS
    DIN EN 15039:2014-07 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYCARBOXILIC ACIDS AND SALTS
    DIN EN 16174:2012-11 Sludge, treated biowaste and soil - Digestion of aqua regia soluble fractions of elements
    DIN EN 15040 E : 2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - PHOSPHONIC ACIDS AND SALTS
    DIN EN 15030 E : 2015 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    BS EN 1211:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - POTASSIUM TRIPOLYPHOSPHATE
    BS EN 1206:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TETRASODIUM PYROPHOSPHATE
    BS EN 1199:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM HYDROGEN ORTHOPHOSPHATE
    BS EN 1208:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM CALCIUM POLYPHOSPHATE
    BS EN 1205:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - DISODIUM DIHYDROGEN PYROPHOSPHATE
    UNE-EN 1197:2015 Chemicals used for treatment of water intended for human consumption - Monozinc phosphate solution
    BS EN 13657:2002 (published 2002-10) Characterization of waste. Digestion for subsequent determination of aqua regia soluble portion of elements
    BS EN 13346:2000 CHARACTERIZATION OF SLUDGES - DETERMINATION OF TRACE ELEMENTS AND PHOSPHORUS - AQUA REGIA EXTRACTION METHODS
    BS EN 1204:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - CALCIUM TETRAHYDROGEN BIS(ORTHOPHOSPHATE)
    EN 15039:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYCARBOXILIC ACIDS AND SALTS
    EN 15040:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - PHOSPHONIC ACIDS AND SALTS
    EN 13657 : 2002 CHARACTERIZATION OF WASTE - DIGESTION FOR SUBSEQUENT DETERMINATION OF AQUA REGIA SOLUBLE PORTION OF ELEMENTS
    EN 15030:2012+A1:2015 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    EN 15041:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYPHOSPHATES
    EN 16174 : 2012 SLUDGE, TREATED BIOWASTE AND SOIL - DIGESTION OF AQUA REGIA SOLUBLE FRACTIONS OF ELEMENTS
    10/30147493 DC : 0 BS EN 16174 - SLUDGE, TREATED BIOWASTE AND SOIL - DIGESTION OF AQUA REGIA SOLUBLE FRACTIONS OF ELEMENTS
    DIN EN 15030:2015-05 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    12/30258173 DC : 0 BS EN 15030 - CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SILVER SALTS FOR INTERMITTENT USE
    BS EN 62321:2009 Electrotechnical products. Determination of levels of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers)
    BS EN 15041:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - POLYPHOSPHATES
    BS EN 15040:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - ANTISCALANTS FOR MEMBRANES - PHOSPHONIC ACIDS AND SALTS
    I.S. EN 62321:2009 ELECTROTECHNICAL PRODUCTS - DETERMINATION OF LEVELS OF SIX REGULATED SUBSTANCES (LEAD, MERCURY, CADMIUM, HEXAVALENT CHROMIUM, POLYBROMINATED BIPHENYLS, POLYBROMINATED DIPHENYL ETHERS)
    I.S. EN 62321-5:2014 DETERMINATION OF CERTAIN SUBSTANCES IN ELECTROTECHNICAL PRODUCTS - PART 5: CADMIUM, LEAD AND CHROMIUM IN POLYMERS AND ELECTRONICS AND CADMIUM AND LEAD IN METALS BY AAS, AFS, ICP-OES AND ICP-MS
    BS EN 13656:2002 (published 2002-10) Characterization of waste. Microwave assisted digestion with hydrofluoric (HF), nitric (HNO3), and hydrochloric (HCl) acid mixture for subsequent determination of elements
    BS EN 1197:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - MONOZINC PHOSPHATE SOLUTION
    BS EN 12879:2000 CHARACTERIZATION OF SLUDGES - DETERMINATION OF THE LOSS ON IGNITION OF DRY MASS
    EN 1197:2014 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - MONOZINC PHOSPHATE SOLUTION
    EN 1203 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TRIPOTASSIUM ORTHOPHOSPHATE
    EN 62321-5 : 2014 DETERMINATION OF CERTAIN SUBSTANCES IN ELECTROTECHNICAL PRODUCTS - PART 5: CADMIUM, LEAD AND CHROMIUM IN POLYMERS AND ELECTRONICS AND CADMIUM AND LEAD IN METALS BY AAS, AFS, ICP-OES AND ICP-MS (IEC 62321-5:2013)
    EN 1211 : 2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - POTASSIUM TRIPOLYPHOSPHATE
    EN 62321 : 2009 ELECTROTECHNICAL PRODUCTS - DETERMINATION OF LEVELS OF SIX REGULATED SUBSTANCES (LEAD, MERCURY, CADMIUM, HEXAVALENT CHROMIUM, POLYBROMINATED BIPHENYLS, POLYBROMINATED DIPHENYL ETHERS)
    I.S. EN 1207:2005 CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - TETRAPOTASSIUM PYROPHOSPHATE

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 5667-3:2012 Water quality Sampling Part 3: Preservation and handling of water samples
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