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ISO 20899:2018PublishedWater quality — Plutonium and neptunium — Test method using ICP-MSISO 20950-1:2018PublishedWater quality — Determination of available weak and dissociable (WAD) cyanide — Part 1: Method using ligand exchange, flow injection analysis (FIA), gas-diffusion and amperometric detectionISO 21115:2019PublishedWater quality — Determination of acute toxicity of water samples and chemicals to a fish gill cell line (RTgill-W1)ISO/TS 21152:2024PublishedGuidance on water conservation techniques of circulating cooling water in thermal power plantsISO/TS 21231:2019PublishedWater quality — Characterization of analytical methods — Guidelines for the selection of a representative matrixISO 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 21338:2010PublishedWater quality — Kinetic determination of the inhibitory effects of sediment, other solids and coloured samples on the light emission of Vibrio fischeri (kinetic luminescent bacteria test)ISO 21427-1:2006PublishedWater quality — Evaluation of genotoxicity by measurement of the induction of micronuclei — Part 1: Evaluation of genotoxicity using amphibian larvaeISO 21427-2:2006PublishedWater quality — Evaluation of genotoxicity by measurement of the induction of micronuclei — Part 2: Mixed population method using the cell line V79ISO 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 21939-2:2023PublishedMethod to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 2: Accounting for energy recoveryISO 21939-1:2019PublishedA method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 1: Biological processesISO 22017:2020PublishedWater quality — Guidance for rapid radioactivity measurements in nuclear or radiological emergency situationISO 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 22125-1:2019PublishedWater quality — Technetium-99 — Part 1: Test method using liquid scintillation countingISO 22125-2:2019PublishedWater quality — Technetium-99 — Part 2: Test method using inductively coupled plasma mass spectrometry (ICP-MS)ISO 22280-1:2026PublishedGroundwater remediation for in situ leach uranium mining — Part 1: Determination of remediation targets