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ISO 21253-2:2019PublishedWater quality — Multi-compound class methods — Part 2: Criteria for the quantitative determination of organic substances using a multi-compound class analytical methodISO 21253-1:2019PublishedWater quality — Multi-compound class methods — Part 1: Criteria for the identification of target compounds by gas and liquid chromatography and mass spectrometryISO 21458:2008PublishedWater quality — Determination of glyphosate and AMPA — Method using high performance liquid chromatography (HPLC) and fluorometric detectionISO 21675:2019PublishedWater quality — Determination of perfluoroalkyl and polyfluoroalkyl substances (PFAS) in water — Method using solid phase extraction and liquid chromatography-tandem mass spectrometry (LC-MS/MS)ISO 21676:2018PublishedWater quality — Determination of the dissolved fraction of selected active pharmaceutical ingredients, transformation products and other organic substances in water and treated waste water — Method using high performance liquid chromatography and mass spectrometric detection (HPLC-MS/MS or -HRMS) after direct injectionISO/TS 21738:2026PublishedWater quality — Active biomonitoring method with in situ caged benthic amphipodsISO 21793:2020PublishedWater quality — Determination of total organic carbon (TOC), dissolved organic carbon (DOC), total bound nitrogen (TNb), dissolved bound nitrogen (DNb), total bound phosphorus (TPb) and dissolved bound phosphorus (DPb) after wet chemical catalysed ozone hydroxyl radical oxidation (COHR)ISO 21863:2020PublishedWater quality — Determination of alkylmercury compounds in water — Method using gas chromatography-mass spectrometry (GC-MS) after phenylation and solvent extractionISO 22032:2026PublishedWater quality — Determination of polybrominated diphenyl ethers (PBDE) in sediment, suspended particulate matter and biota — Method using gas chromatography coupled with tandem mass spectrometry (GC-MS/MS) or with high resolution mass spectrometry (GC-HRMS)ISO 22066:2020PublishedWater quality — Determination of total cyanide — Method using segmented flow injection, in-line ultraviolet digestion analysis by gas diffusion and amperometric detectionISO 22104:2021PublishedWater quality — Determination of microcystins — Method using liquid chromatography and tandem mass spectrometry (LC-MS/MS)ISO 22478:2006PublishedWater quality — Determination of certain explosives and related compounds — Method using high-performance liquid chromatography (HPLC) with UV detectionISO 22719:2008PublishedWater quality — Determination of total alkalinity in sea water using high precision potentiometric titrationISO 22743:2006PublishedWater quality — Determination of sulfates — Method by continuous flow analysis (CFA)ISO 23256:2023PublishedWater quality — Detection of selected congeners of polychlorinated dibenzo-p-dioxins and polychlorinated biphenyls — Method using a flow immunosensor techniqueISO 23631:2006PublishedWater quality — Determination of dalapon, trichloroacetic acid and selected haloacetic acids — Method using gas chromatography (GC-ECD and/or GC-MS detection) after liquid-liquid extraction and derivatizationISO 23695:2023PublishedWater quality — Determination of ammonium nitrogen in water — Small-scale sealed tube methodISO 23696-1:2023PublishedWater quality — Determination of nitrate in water using small-scale sealed tubes — Part 1: Dimethylphenol colour reactionISO 23696-2:2023PublishedWater quality — Determination of nitrate in water using small-scale sealed tubes — Part 2: Chromotropic acid colour reactionISO 23697-1:2023PublishedWater quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes — Part 1: Dimethylphenol colour reactionISO 23697-2:2023PublishedWater quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes — Part 2: Chromotropic acid colour reactionISO 24293:2009PublishedWater quality — Determination of individual isomers of nonylphenol — Method using solid phase extraction (SPE) and gas chromatography/mass spectrometry (GC/MS)ISO 24384:2024PublishedWater quality — Determination of chromium(VI) and chromium(III) in water — Method using liquid chromatography with inductively coupled plasma mass spectrometry (LC-ICP-MS) after chelating pretreatmentISO 25101:2009PublishedWater quality — Determination of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) — Method for unfiltered samples using solid phase extraction and liquid chromatography/mass spectrometryISO 27108:2010PublishedWater quality — Determination of selected plant treatment agents and biocide products — Method using solid-phase microextraction (SPME) followed by gas chromatography-mass spectrometry (GC-MS)