介绍异辛烷中六氯苯溶液标准物质研制方法.以色谱纯异辛烷和已准确定值的六氯苯为原料,采用重量–容量法准确制备特性量值为10.0 ng/μL的异辛烷中六氯苯溶液标准物质.分别采用F检验和t检验对标准物质进行均匀性、稳定性检验,并对定值结果的不确定度进行评定.结果表明该标准物质均匀性和稳定性良好,有效期为12个月,定值结果的相对扩展不确定度为3％(k=2),已被批准为国家二级标准物质,编号为GBW(E)082880.该标准物质可用于环境污染物六氯苯的定性及定量分析和气相色谱–质谱联用仪的校准.

N-nitrosodimethylamine (NDMA) is frequently detected with higher concentration among nitrosamine compounds in water. Nitrosamines were tested by Gas Chromatography coupled with Fire Ionization Detector (GC-FID) in an issued environmental standard HJ 809-2016. In this study, the uncertainty of NDMA, a typical compound of Nitrosamines, was detailed analyzed and assessed, and the applicability for the testing standard HJ 809-2016 was evaluated. It was reported that Nitrosamines were generally at the level of ng/L in China at present, which is far below the detection limit of HJ 809-2016. Furthermore, according to nitrosamines production process of domestic water plants and its health risk, the water quality safety limit was recommend to be 6~40 ng/L for our country, which is also lower than the detection limit of HJ 809-2016 by an order of magnitude. Therefore, there are great limitation in the application of this testing standard when considering the present situation in water, toxicity, and human health risk of nitrosamines. It is obviously difficult to meet the testing need of lower concentration detection of nitrosamines in drinking water and source water. A better test method with higher sensitivity and lower detection limit, like mass spectrometry used in most testing labs, should be established to satisfy the technology need for nitrosamines in water quality monitoring.