水质. 水中挥发性有机物的测定. 顶空固相微萃取法 (HS-SPME) 和随后的气相色谱-质谱法 (GC-MS

[中文适用范围]： 本国际标准规定了一种测定挥发性有机化合物（见表1）的方法。该方法包括卤代烃、三卤甲烷、汽油组分（如BTX、MTBE和ETBE）、萘、2-乙基-1,3-二氧戊环以及地霉菌素和2-甲基异莰醇等高气味物质在饮用水、地下水、地表水和处理后的废水中的测定，采用顶空固相微萃取（HS-SPME）结合气相色谱 - 质谱（GC-MS）技术。测定限取决于基体、待分析的具体化合物以及质谱仪的灵敏度。对于本国际标准适用的大多数化合物，测定限至少为0.01 µg/l。已在实验室间试验中验证了0.02 µg/l至2.6 µg/l浓度范围相关数据。源自标准化工作的额外验证数据显示，该方法适用于单个物质浓度从0.01 µg/l至100 µg/l的范围。所有测定均在少量样品上进行（例如样品体积为10 ml）。该方法可能适用于本国际标准未明确涵盖的其他化合物或其他类型的水体。但是，必须针对每种情况验证其适用性。 [外文原描述]： ISO 17943:2016 specifies a method for the determination of volatile organic compounds (see Table 1). This comprises, for example, halogenated hydrocarbons, trihalogenated methanes, gasoline components (such as BTEX, MTBE, and ETBE), naphthalene, 2-ethyl-4-methyl-1,3-dioxolane, and highly odorous substances like geosmin and 2-methylisoborneol in drinking water, ground water, surface water, and treated waste water, by means of headspace solid-phase micro-extraction (HS-SPME) followed by gas chromatography-mass spectrometry (GC-MS). The limit of determination depends on the matrix, on the specific compound to be analysed, and on the sensitivity of the mass spectrometer. For most compounds to which this International Standard applies, it is at least 0,01 µg/l. Validation data related to a concentration range between 0,02 µg/l and 2,6 µg/l have been demonstrated in an interlaboratory trial. Additional validation data derived from standardization work show applicability of the method within a concentration range from 0,01 µg/l to 100 µg/l of individual substances. All determinations are performed on small sample amounts (e.g. sample volumes of 10 ml).