作者：周杨1, 苏勤凯1, 赵陈晨2, 谢翔3, 罗霜4, 何晋2, 吴佳伦2
作者单位：1. 成都市污染源监测中心锦江监测站，四川 成都 610011;
2. 四川省成都生态环境监测中心站，四川 成都 610011;
3. 成都市石油化学工业园区环境监测站，四川 彭州 611900;
4. 成都市污染源监测中心，四川 成都 610011
关键词：大气挥发性有机物;电子制冷;gc-ms;配对样品t检验
摘要：
通过对电子制冷预浓缩捕集管温度、采样流量、脱水管温度等条件的优化，建立罐采样-电子制冷型冷阱预浓缩/gc-ms同时测定大气中101种挥发性有机物（vocs）的实验室分析方法。评估优化后的方法性能：101种vocs组分平均相对响应因子≤14.3%，相关系数＞0.995，方法检出限为0.001~0.016 nmol/mol，近90%的组分实际样品加标回收率在76.1%~105%之间，低、中、高浓度测定结果的相对标准偏差（rsd）分别为1.1%~20.7%、0.1%~13.3%、0.2%~5.3%，加湿标气测定结果的相对误差在±10%内。用电子制冷型预浓缩和深冷型预浓缩仪分别测定同一批样品，配对样品t检验的结果显示，两种方法测定结果没有显著性差异。
laboratory method for the pre-concentration determination of atmospheric volatile organic compounds by electronically refrigerated cold traps
zhou yang1, su qinkai1, zhao chenchen2, xie xiang3, luo shuang4, he jin2, wu jialun2
1. jinjiang monitoring station of chengdu pollution source monitoring center, chengdu 610011, china;
2. chengdu ecological environment monitoring center station of sichuan, chengdu 610011, china;
3. environmental monitoring station of chengdu petrochemical industrial park , chengdu 611900, china;
4. chengdu pollution source monitoring center, chengdu 610011, china
abstract: by optimizing the temperature of electronic refrigeration preconcentration trap, sampling flow rate and dehydration tube temperature, a laboratory analysis method to monitor the 101 kinds of volatile organic compounds (vocs) in atmosphere was established using a tank sampling and electronic cold trap preconcentration /gc-ms synchronization technology. the optimized method was evaluated and the results showed that: the average relative response factor of the 101 vocs components were less than 14.3%, the correlation coefficient were bigger than 0.995, the detection limits of the method were 0.001 nmol/mol to 0.016 nmol/mol, for nearly 90% components of the actual sample’s recovery rates were 76.1% -105%, respectively. the relative standard deviations (rsds) of the low, medium and high concentration measurement were 1.1%-20.7%, 0.1%-13.3%, 0.2%-5.3%, respectively. the relative errors of the humidification standard gas measurement results were within ±10%. the same batch of samples were simultaneously detected by electronically cooled pre-concentration and cryogenic pre-concentration apparatus, and t-test showed no significant difference in the results of the two methods.
keywords: atmospheric volatile organic compounds;electronic refrigeration;gc-ms;paired samples t-test
2023, 49(2):80-86,125 收稿日期: 2022-07-19;收到修改稿日期: 2022-09-20
基金项目:
作者简介: 周杨(1987-),女,四川彭州市人,工程师,主要从事环境监测工作
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