| 环境空气监测用氮中甲烷气体标准物质质量评估 |
| Quality Assessment of CH4/N2 Gas Reference Materials for Ambient Air Monitoring |
| 投稿时间：2023-06-19 修订日期：2023-08-31 |
| DOI：10.19316/j.issn.1002-6002.2024.04.04 |
| 中文关键词: 环境空气监测 非甲烷总烃 气体标准物质 质量评估 |
| 英文关键词:ambient air monitoring non methane total hydrocarbon gas reference materials quality assessment |
| 基金项目: |
| 作者 | 单位 | | 王翀 | 河南省郑州生态环境监测中心, 河南 郑州 450007 | | 吕怡兵 | 中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012 | | 杨婧 | 中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012 | | 谭铃* | 重庆市生态环境监测中心, 重庆 401147 | | 吴海 | 中国计量科学研究院, 北京 100029 | | 丁萌萌 | 北京市生态环境监测中心, 北京 100048 | | 杨静 | 生态环境部环境发展中心环境标准样品研究所, 国家环境保护污染物计量和标准样品研究重点实验室, 北京 100029 | | 王德发 | 中国计量科学研究院, 北京 100029 | | 李和通 | 河南省郑州生态环境监测中心, 河南 郑州 450007 | | 马焕敏 | 中节能数智(北京)环境技术研究院有限公司, 北京 100070 |
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| 通讯作者:谭铃* 重庆市生态环境监测中心, 重庆 401147 |
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| 中文摘要: |
| 为了解和掌握当前环境空气非甲烷总烃监测所使用的氮中甲烷气体标准物质的质量状况,通过对全国范围内开展环境空气非甲烷总烃监测的实验室中的99家进行使用情况调查,发现共涉及35家制造商。选择其中使用占比较高的10家,另外再随机选取6家,通过匿名采购等方式获取31瓶氮中甲烷气体标准物质。经两家测试单位分别测试后,采用归一化偏差(En)法和相对偏差法两种方法评价所选标准物质的量值准确性和监测适用性,同时依照相关国家计量技术规范评估其证书完整性和规范性。结果显示,两种方法的评价结果一致。16家制造商中,14家的27瓶气体标准物质定值准确,2家的4瓶气体标准物质定值不准确;9家证书相对完整、规范,其余7家普遍存在缺少标准物质唯一标识等问题,部分制造商甚至存在涉嫌冒用证书、证书中的定值浓度超出认定范围等问题。鉴于氮中甲烷气体标准物质是保障非甲烷总烃监测结果准确性、可比性和可溯源性的重要基础,且制造商数量众多,建议使用者加强标准物质质量评估工作,并审查其所附证书的规范性。 |
| 英文摘要: |
| In order to understand and grasp the quality status of methane (CH4/N2) gas reference materials in nitrogen used for monitoring of non methane total hydrocarbons in ambient air, a survey was conducted on the use of 99 laboratories that have carried out monitoring of non methane total hydrocarbons in ambient air in China,and a total of 35 manufacturers were found to be involved. 10 manufacturers with high usage were selected, and 6 manufacturers were randomly selected to obtain 31 bottles of methane gas reference materials through anonymous procurement. After being tested separately by two testing institutions, normalized deviation (En) value method and relative deviation were used to evaluate the accuracy of their quantity values and applicability of monitoring. Meanwhile,the integrity and standardization of their certificates were evaluated according to relevant national standards. The results showed that the evaluation results of the two methods were consistent. Among the 16 manufacturers,14 manufacturers had accurate values of 27 bottles of sampled gas reference materials,and 2 manufacturers had inaccurate values of 4 bottles. The certificates of 9 manufacturers were relatively complete and standardized, and the other 7 manufacturers had problems such as lack of unique identification of reference materials, and some manufacturers even had problems such as suspected fraudulent use of certificates and fixed concentrations in certificates beyond the identification range. Given that CH4/N2 gas reference materials are an important basis for the accuracy,comparability and traceability of non methane total hydrocarbon monitoring results,and that there are a large number of manufacturers,it is recommended that users strengthen the quality assessment of gas reference materials and review the prescriptibility of their accompanying certificates. |
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