State Environmental Protection Key Laboratory of Environmental Pollutant Metrology and Reference Materials, Institute for Environmental Reference Materials, Environmental Development Centre of the Ministry of Ecology and Environment, Beijing 100029, China.
Molecules. 2021 Jul 20;26(14):4370. doi: 10.3390/molecules26144370.
Water matrix certified reference material (MCRM) of volatile organic compounds (VOCs) is used to provide quality assurance and quality control (QA/QC) during the analysis of VOCs in water. In this research, a water MCRM of 28 VOCs was developed using a "reconstitution" approach by adding VOCs spiking, methanol solution into pure water immediately prior to analysis. The VOCs spiking solution was prepared gravimetrically by dividing 28 VOCs into seven groups, then based on ISO Guide 35, using gas chromatography-mass spectrometry (GC-MS) to investigate the homogeneity and long-term stability. The studies of homogeneity and long-term stability indicated that the batch of VOCs spiking solution was homogeneous and stable at room temperature for at least 15 months. Moreover, the water MCRM of 28 VOCs was certified by a network of nine competent laboratories, and the certified values and expanded uncertainties of 28 VOCs ranged from 6.2 to 17 μg/L and 0.5 to 5.3 μg/L, respectively.
水基质认证参考物质（MCRM）用于挥发性有机化合物（VOCs），在分析水中 VOCs 时，提供质量保证和质量控制（QA/QC）。在这项研究中，采用“再配制”方法开发了一种 28 种 VOCs 的水 MCRM，通过在分析前立即向纯净水添加 VOCs 加标甲醇溶液。通过将 28 种 VOCs 分成七组进行重量法制备 VOCs 加标溶液，然后根据 ISO 指南 35，使用气相色谱-质谱法（GC-MS）研究其均匀性和长期稳定性。均匀性和长期稳定性研究表明，该批 VOCs 加标溶液在室温下至少 15 个月是均匀且稳定的。此外，28 种 VOCs 的水 MCRM 由九个有能力的实验室进行了认证，28 种 VOCs 的认证值和扩展不确定度分别为 6.2 至 17μg/L 和 0.5 至 5.3μg/L。
