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首页> 《中国测试》期刊 >本期导读>应急监测用多组分挥发性有机物气体标准物质研制

应急监测用多组分挥发性有机物气体标准物质研制

159    2024-06-26

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作者:余楠, 李鹏辉, 张鹏辉, 蒋昌怀, 刘季业, 袁娇阳, 杨嘉伟

作者单位:四川中测标物科技有限公司,四川 成都 610052


关键词:挥发性有机物;环境空气监测;硅烷化;重量法;不确定度


摘要:

介绍了瓶装1 μmol/mol氮中52组分挥发性有机物气体标准物质的研制过程。所选52种目标组分满足中国环境标准HJ 1223—2021《环境空气 挥发性有机物的应急测定 便携式气相色谱-质谱法》中所规定的环境空气中有害挥发性有机物的监测需求,建立质谱选择离子扫描(SIM)的分析方法。通过气瓶筛选实验,选取配备硅烷化阀门的特殊气瓶作为充装容器,使用GC-MS研究目标化合物的均匀性及长期稳定性。结果表明:该气体标准物质分析平衡时间短,大幅提高分析效率,1年内稳定性良好,满足现场应急测定需求。同时,严格按照GB/T 5274.1—2018中给出的不确定度计算公式评定研制标物的不确定度,其相对扩展不确定度为U=5%(k=2)。


Development of multi-component organic gas standard for emergency monitoring
YU Nan, LI Penghui, ZHANG Penghui, JIANG Changhuai, LIU Jiye, YUAN Jiaoyang, YANG Jiawei
Sichuan Zhongce RM Co., Ltd., Chengdu 610052, China
Abstract: The paper introduces the development process of multi-component VOCs gas in nitrogen at 1 μmol/mol level which was checked using GC-MS coupled with select ion scanning mode. The 52 target components were selected to meet the monitoring requirements of hazardous volatile organic compounds specified in Chinese environmental standard HJ 1223—2021 Ambient air—Emergency determination of volatile organic compounds—Portable gas chromatography-mass spectrometry. The special gas cylinder equipped with a silanization valve was selected as the filling container through a gas cylinder screening experiment. The homogeneity and stability of the target compounds were tested using GC-MS. The results showed that the purge time was short, which improved the analysis efficiency, and better stability could meet the needs of on-site emergency determination. According to the uncertainty calculation formula given in GB/T 5274.1—2018, the relative expanded uncertainty was calculated as U=5% (k=2).
Keywords: volatile organic compounds; atmospheric monitoring; silanization; gravimetric method; uncertainty
2024, 50(6):70-78 收稿日期: 2022-11-10;收到修改稿日期: 2022-12-28
基金项目: 四川省重大科学仪器设备专项(2019ZDZX0035)
作者简介: 余楠(1994-),男,四川成都市人,硕士,主要从事标准物质研制和分析方法研究。
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