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  • ISO 8192:2007

    Current The latest, up-to-date edition.

    Water quality Test for inhibition of oxygen consumption by activated sludge for carbonaceous and ammonium oxidation

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English, French

    Published date:  15-01-2007

    Publisher:  International Organization for Standardization

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    Abstract - (Show below) - (Hide below)

    ISO 8192:2007 specifies a method for assessing the inhibitory effect of a test material on the oxygen consumption of activated sludge microorganisms.

    This method is intended to represent the conditions in biological waste-water treatment plants. It gives information on inhibitory or stimulatory effects after a short exposure (usually 30 min up to 180 min or even more ) of the test material on activated sludge microorganisms.

    This method is applicable for testing waters, waste waters, pure chemicals and mixtures of chemicals. Concerning the chemicals, the method refers to those which are soluble under the test conditions. Special care is necessary with materials of low water solubility or high volatility, and with materials abiotically consuming or producing oxygen.

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

    Development Note Supersedes ISO/DIS 8192. (01/2007)
    Document Type Standard
    Publisher International Organization for Standardization
    Status Current
    Supersedes

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

    BS 6068-5.6(1985) : 1985 WATER QUALITY - BIOLOGICAL METHODS - EVALUATION IN AQUEOUS MEDIUM OF THE "ULTIMATE" AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS METHOD BY ANALYSIS OF DISSOLVED ORGANIC CARBON (DOC)
    05/30098184 DC : DRAFT MAY 2005 ISO 8068 - LUBRICANTS, INDUSTRIAL OILS AND RELATED PRODUCTS (CLASS L) - FAMILY T (TURBINES) - SPECIFICATIONS FOR LUBRICATING OILS FOR TURBINES
    BS 6068-5.0:1998 Water quality. Biological methods Selection of tests for biodegradability
    I.S. EN ISO 9439:2000 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM - CARBON DIOXIDE EVOLUTION TEST
    BS ISO 6107-2 : 2006 WATER QUALITY - VOCABULARY - PART 2
    BS 6068-5.31(2002) : 2002 WATER QUALITY - EVALUATION OF THE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS AT LOW CONCENTRATIONS - PART 2: CONTINUOUS FLOW RIVER MODEL WITH ATTACHED BIOMASS
    BS 6068-5.20(1996) : 1996 AMD 10320 WATER QUALITY - BIOLOGICAL METHODS - EVALUATION OF THE ELIMINATION AND BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - ACTIVATED SLUDGE SIMULATION TEST
    BS 6068-5.25:1999 Water quality. Biological methods Determination of the inhibitory effect of water constituents on the growth of activated sludge microorganisms - Section 5.25 Determination of the inhibitory effect of water constituents on the growth of activated sludge organisms
    17/30353431 DC : 0 BS EN ISO 14852 - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN AN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF EVOLVED CARBON DIOXIDE
    BS 6068-5.11(1993) : 1993 WATER QUALITY - BIOLOGICAL METHODS - METHOD BY DETERMINING THE OXYGEN DEMAND IN A CLOSED RESPIROMETER
    BS 6068-5.13(1993) : 1993 WATER QUALITY - BIOLOGICAL METHODS - STATIC TEST (ZAHN-WELLENS METHOD)
    DIN ISO 15380:2004-05 LUBRICANTS, INDUSTRIAL OILS AND RELATED PRODUCTS (CLASS L) - FAMILY H (HYDRAULIC SYSTEMS) - SPECIFICATIONS FOR CATEGORIES HETG, HEPG, HEES AND HEPR
    BS EN ISO 17556:2012 Plastics. Determination of the ultimate aerobic biodegradability of plastic materials in soil by measuring the oxygen demand in a respirometer or the amount of carbon dioxide evolved
    BS EN ISO 14851:2004 Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium. Method by measuring the oxygen demand in a closed respirometer
    EN ISO 14851:2004 Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium - Method by measuring the oxygen demand in a closed respirometer (ISO 14851:1999)
    BS EN ISO 9439:2001 Water quality. Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium. Carbon dioxide evolution test
    BS EN ISO 9888:1999 Water quality. Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium. Static test (Zahn-Wellens method)
    ISO 7827:2010 Water quality Evaluation of the "ready", "ultimate" aerobic biodegradability of organic compounds in an aqueous medium Method by analysis of dissolved organic carbon (DOC)
    CEN/TR 16227:2011 Liquid petroleum products - Bio-lubricants - Recommendation for terminology and characterisation of bio-lubricants and bio-based lubricants
    CEN ISO/TR 15462:2009 Water quality - Selection of tests for biodegradability (ISO/TR 15462:2006)
    EN ISO 9888 : 1999 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM - STATIC TEST (ZAHN-WELLENS METHOD) (ISO 9888:1999)
    I.S. EN ISO 9888:1999 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM - STATIC TEST (ZAHN-WELLENS METHOD)
    BS ISO 8068:2006 Lubricants, industrial oils and related products (class L). Family T (turbines). Specification for lubricating oils for turbines
    UNE-EN ISO 17556:2013 Plastics - Determination of the ultimate aerobic biodegradability of plastic materials in soil by measuring the oxygen demand in a respirometer or the amount of carbon dioxide evolved (ISO 17556:2012)
    I.S. EN ISO 9408:1999 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM BY DETERMINATION OF OXYGEN DEMAND IN A CLOSED RESPIROMETER
    09/30195726 DC : 0 BS ISO 7827 - WATER QUALITY - EVALUATION OF THE "READY", "ULTIMATE" AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF DISSOLVED ORGANIC CARBON (DOC)
    ASTM D 6731 : 2001 : R2011 Standard Test Method for Determining the Aerobic, Aquatic Biodegradability of Lubricants or Lubricant Components in a Closed Respirometer
    ISO 18749:2004 Water quality — Adsorption of substances on activated sludge — Batch test using specific analytical methods
    ISO 15522:1999 Water quality Determination of the inhibitory effect of water constituents on the growth of activated sludge microorganisms
    BS EN 29439:1992 Water quality. Evaluation in an aqueous medium of the \'ultimate\' aerobic biodegradability of organic compounds: method by analysis of released carbon dioxide
    I.S. EN ISO 7827:2012 WATER QUALITY - EVALUATION OF THE "READY", "ULTIMATE" AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF DISSOLVED ORGANIC CARBON (DOC) (ISO 7827:2010)
    DIN EN ISO 7827:2013-03 Water quality - Evaluation of the "ready", "ultimate" aerobic biodegradability of organic compounds in an aqueous medium - Method by analysis of dissolved organic carbon (DOC) (ISO 7827:2010)
    I.S. EN ISO 9509:2006 WATER QUALITY - TOXICITY TEST FOR ASSESSING THE INHIBITION OF NITRIFICATION OF ACTIVATED SLUDGE MICROORGANISMS
    BS 6068-5.23(1999) : 1999 AMD 15780 WATER QUALITY - BIOLOGICAL METHODS - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF RELEASED INORGANIC CARBON IN SEALED VESSELS (CO[2] HEADSPACE TEST)
    NF ISO 15522 : 2003 FD QUALITE DE L'EAU - DETERMINATION DE L'EFFET INHIBITEUR DES CONSTITUANTS DE L'EAU SUR LA CROISSANCE DES MICRO-ORGANISMES DE BOUES ACTIVEES
    00/563432 DC : DRAFT JUL 2000 BS ISO 14592-2 - WATER QUALITY - EVALUATION OF THE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS AT LOW CONCENTRATIONS - PART 2: CONTINUOUS FLOW RIVER MODEL WITH ATTACHED BIOMASS
    DIN EN ISO 14851:2016-07 (Draft) DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN AN AQUEOUS MEDIUM - METHOD BY MEASURING THE OXYGEN DEMAND IN A CLOSED RESPIROMETER
    PD CEN ISO/TR 15462:2009 Water quality. Selection of tests for biodegradability
    BS EN ISO 14852:2004 Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium. Method by analysis of evolved carbon dioxide
    I.S. EN ISO 14851:2004 DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN AN AQUEOUS MEDIUM - METHOD BY MEASURING THE OXYGEN DEMAND IN A CLOSED RESPIROMETER
    UNI EN ISO 17556 : 2012 PLASTICS - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN SOIL BY MEASURING THE OXYGEN DEMAND IN A RESPIROMETER OR THE AMOUNT OF CARBON DIOXIDE EVOLVED
    EN ISO 17556:2012 Plastics - Determination of the ultimate aerobic biodegradability of plastic materials in soil by measuring the oxygen demand in a respirometer or the amount of carbon dioxide evolved (ISO 17556:2012)
    ASTM D 6731 : 2001 : R2005 Standard Test Method for Determining the Aerobic, Aquatic Biodegradability of Lubricants or Lubricant Components in a Closed Respirometer
    UNI CEN/TR 16227 : 2011 LIQUID PETROLEUM PRODUCTS - BIO-LUBRICANTS - RECOMMENDATION FOR TERMINOLOGY AND CHARACTERISATION OF BIO-LUBRICANTS AND BIO-BASED LUBRICANTS
    ISO 14851:1999 Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium Method by measuring the oxygen demand in a closed respirometer
    BS EN ISO 7827:2012 Water quality. Evaluation of the \'ready\', \'ultimate\' aerobic biodegradability of organic compounds in an aqueous medium. Method by analysis of dissolved organic carbon (DOC)
    UNE-EN ISO 7827:2013 Water quality - Evaluation of the "ready", "ultimate" aerobic biodegradability of organic compounds in an aqueous medium - Method by analysis of dissolved organic carbon (DOC) (ISO 7827:2010)
    UNE-ISO 6107-2:2010 Water quality. Vocabulary. Part 2.
    EN ISO 7827:2012 WATER QUALITY - EVALUATION OF THE "READY", "ULTIMATE" AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF DISSOLVED ORGANIC CARBON (DOC) (ISO 7827:2010)
    BS EN 29888:1993 Water quality. Evaluation of the aerobic biodegradability of organic compounds in an aqueous medium. Static test (Zahn-Wellens method)
    18/30370138 DC : DRAFT APR 2018 BS EN ISO 17556 - PLASTICS - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTICS MATERIALS IN SOIL BY MEASURING THE OXYGEN DEMAND IN A RESPIROMETER OR THE AMOUNT OF CARBON DIOXIDE EVOLVED
    BS ISO 14592-2:2002 Water quality. Evaluation of the aerobic biodegradability of organic compounds at low concentrations Continuous flow river model with attached biomass
    11/30217470 DC : 0 BS EN ISO 17556 - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTICS MATERIALS IN SOIL BY MEASURING THE OXYGEN DEMAND IN A RESPIROMETER OR THE AMOUNT OF CARBON DIOXIDE EVOLVED
    02/565335 DC : DRAFT DEC 2002 EN ISO 11733 - WATER QUALITY - EVALUATION OF THE ELIMINATION AND BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - ACTIVATED SLUDGE SIMULATION TEST
    BS ISO 17556 : 2003 AMD 15560 PLASTICS - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY IN SOIL BY MEASURING THE OXYGEN DEMAND IN A RESPIROMETER OR THE AMOUNT OF CARBON DIOXIDE EVOLVED
    BS 6068-6.16(1998) : 1998 WATER QUALITY - SAMPLING - GUIDANCE ON BIOTESTING OF SAMPLES
    16/30333274 DC : 0 BS EN ISO 14851 - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN AN AQUEOUS MEDIUM - METHOD BY MEASURING THE OXYGEN DEMAND IN A CLOSED RESPIROMETER
    I.S. EN ISO 14852:2004 DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN AN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF EVOLVED CARBON DIOXIDE
    ISO 9888:1999 Water quality Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium Static test (Zahn-Wellens method)
    DIN EN ISO 17556:2012-12 PLASTICS - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN SOIL BY MEASURING THE OXYGEN DEMAND IN A RESPIROMETER OR THE AMOUNT OF CARBON DIOXIDE EVOLVED (ISO 17556:2012)
    ISO 17556:2012 Plastics Determination of the ultimate aerobic biodegradability of plastic materials in soil by measuring the oxygen demand in a respirometer or the amount of carbon dioxide evolved
    ISO 14852:1999 Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium Method by analysis of evolved carbon dioxide
    I.S. EN ISO 17556:2012 PLASTICS - DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN SOIL BY MEASURING THE OXYGEN DEMAND IN A RESPIROMETER OR THE AMOUNT OF CARBON DIOXIDE EVOLVED (ISO 17556:2012)
    ISO 6107-2:2006 Water quality Vocabulary Part 2:
    BS EN ISO 11733:2004 Water quality. Determination of the elimination and biodegradability of organic compounds in an aqueous medium. Activated sludge simulation test
    BS EN ISO 14593:2005 Water quality. Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium. Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test)
    ISO 11733:2004 Water quality — Determination of the elimination and biodegradability of organic compounds in an aqueous medium — Activated sludge simulation test
    ISO 9509:2006 Water quality Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms
    ISO 9408:1999 Water quality — Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium by determination of oxygen demand in a closed respirometer
    ISO 14593:1999 Water quality Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test)
    BS EN ISO 9509:2006 Water quality. Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms
    ISO 9887:1992 Water quality — Evaluation of the aerobic biodegradability of organic compounds in an aqueous medium — Semi-continuous activated sludge method (SCAS)
    EN ISO 11733 : 2004 WATER QUALITY - DETERMINATION OF THE ELIMINATION AND BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - ACTIVATED SLUDGE SIMULATION TEST
    EN ISO 9887 : 1994 WATER QUALITY - EVALUATION OF THE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - SEMI-CONTINUOUS ACTIVATED SLUDGE METHOD (SCAS)
    EN 29888 : 1993 WATER QUALITY - EVALUATION OF THE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AN AQUEOUS MEDIUM - STATIC TEST (ZAHN-WELLENS METHOD)
    EN ISO 9408 : 1999 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM BY DETERMINATION OF OXYGEN DEMAND IN A CLOSED RESPIROMETER
    EN ISO 9509:2006 Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms (ISO 9509:2006)
    EN ISO 14593:2005 Water quality - Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium - Method by analysis of inorganic carbon in sealed vessels (CO2 headspace test) (ISO 14593:1999)
    EN 29439 : 1993 WATER QUALITY - EVALUATION IN AN AQUEOUS MEDIUM OF THE "ULTIMATE" AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS - METHOD BY ANALYSIS OF RELEASED CARBON DIOXIDE
    EN 29408 : 1993 WATER QUALITY - EVALUATION IN AN AQUEOUS MEDIUM OF THE "ULTIMATE" AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS - METHOD OF DETERMINING THE OXYGEN DEMAND IN A CLOSED RESPIROMETER
    EN ISO 9439 : 2000 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM - CARBON DIOXIDE EVOLUTION TEST
    BS 6068-5.12(1993) : 1993 WATER QUALITY - BIOLOGICAL METHODS - METHOD BY ANALYSIS OF RELEASED CARBON DIOXIDE
    02/562744 DC : 0 BS ISO 18749 - WATER QUALITY - ADSORPTION OF SUBSTANCES ON ACTIVATED SLUDGE - BATCH TEST USING SPECIFIC ANALYTICAL METHODS
    DIN EN ISO 14852:2004-10 DETERMINATION OF THE ULTIMATE AEROBIC BIODEGRADABILITY OF PLASTIC MATERIALS IN AN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF EVOLVED CARBON DIOXIDE
    15/30310648 DC : 0 BS ISO 15380 - LUBRICANTS, INDUSTRIAL OILS AND RELATED PRODUCTS (CLASS L) - FAMILY H (HYDRAULIC SYSTEMS) - SPECIFICATIONS FOR HYDRAULIC FLUIDS IN CATEGORIES HETG, HEPG, HEES AND HEPR
    PD CEN/TR 16227:2011 Liquid petroleum products. Bio-lubricants. Recommendation for terminology and characterisation of bio-lubricants and bio-based lubricants
    BS ISO 15380:2016 Lubricants, industrial oils and related products (class L). Family H (Hydraulic systems). Specifications for hydraulic fluids in categories HETG, HEPG, HEES and HEPR
    EN ISO 14852:2004 Determination of the ultimate aerobic biodegradability of plastic materials in an aqueous medium - Method by analysis of evolved carbon dioxide (ISO 14852:1999)
    ISO 14592-2:2002 Water quality — Evaluation of the aerobic biodegradability of organic compounds at low concentrations — Part 2: Continuous flow river model with attached biomass
    ISO 8068:2006 Lubricants, industrial oils and related products (class L) — Family T (Turbines) — Specification for lubricating oils for turbines
    ISO 15380:2016 Lubricants, industrial oils and related products (class L) — Family H (Hydraulic systems) — Specifications for hydraulic fluids in categories HETG, HEPG, HEES and HEPR
    ASTM D 6731 : 2001 Standard Test Method for Determining the Aerobic, Aquatic Biodegradability of Lubricants or Lubricant Components in a Closed Respirometer
    S.R. CEN/TR 16227:2011 LIQUID PETROLEUM PRODUCTS - BIO-LUBRICANTS - RECOMMENDATION FOR TERMINOLOGY AND CHARACTERISATION OF BIO-LUBRICANTS AND BIO-BASED LUBRICANTS
    S.R. CEN ISO/TR 15462:2009 WATER QUALITY - SELECTION OF TESTS FOR BIODEGRADABILITY
    DIN EN ISO 14593:2005-09 WATER QUALITY - EVALUATION OF ULTIMATE AEROBIC BIODEGRADABILITY OF ORGANIC COMPOUNDS IN AQUEOUS MEDIUM - METHOD BY ANALYSIS OF INORGANIC CARBON IN SEALED VESSELS (CO[2] HEADSPACE TEST)
    ISO 9439:1999 Water quality Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium Carbon dioxide evolution test
    BS EN ISO 9408:1999 Water quality. Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium by determination of oxygen demand in a closed respirometer
    ISO/TR 15462:2006 Water quality Selection of tests for biodegradability
    BS EN 29408:1993 Water quality. Evaluation in an aqueous medium of the \'ultimate\' aerobic biodegradability of organic compounds: method by determining the oxygen demand in a closed respirometer
    DIN EN ISO 11733:2004-11 Water quality - Determination of the elimination and biodegradability of organic compounds in an aqueous medium - Activated sludge simulation test (ISO 11733:2004)

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    ISO 13641-1:2003 Water quality Determination of inhibition of gas production of anaerobic bacteria Part 1: General test
    ISO 11923:1997 Water quality — Determination of suspended solids by filtration through glass-fibre filters
    ISO 9509:2006 Water quality Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms
    ISO 9887:1992 Water quality — Evaluation of the aerobic biodegradability of organic compounds in an aqueous medium — Semi-continuous activated sludge method (SCAS)
    ISO 5814:2012 Water quality — Determination of dissolved oxygen — Electrochemical probe method
    ISO 9888:1999 Water quality Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium Static test (Zahn-Wellens method)
    ISO 11733:2004 Water quality — Determination of the elimination and biodegradability of organic compounds in an aqueous medium — Activated sludge simulation test
    ISO/TR 15462:2006 Water quality Selection of tests for biodegradability
    ISO 3696:1987 Water for analytical laboratory use — Specification and test methods
    ISO 5667-16:2017 Water quality — Sampling — Part 16: Guidance on biotesting of samples
    ISO 10634:1995 Water quality Guidance for the preparation and treatment of poorly water-soluble organic compounds for the subsequent evaluation of their biodegradability in an aqueous medium
    ISO 6107-1:2004 Water quality Vocabulary Part 1:
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