动态稀释校准仪对VOCs自动监测系统的影响
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摘要
基于环境空气VOCs自动监测系统中动态稀释校准仪在相同稀释比和不同稀释流量条件下,对仪器测试结果误差的影响进行研究,指出了当前环境空气VOCs自动监测普遍使用的校准仪的不足之处。选取臭氧前体物(PAMS) 57种有机化合物,以不同稀释总流量,分别测试0. 5和1. 0 nmol/mol的平均检出限以及平均回测偏差,结果显示,在输出流量>1 000 m L/min时,平均检出限分别在0. 02～0. 17和0. 01～0. 10 nmol/mol;平均回测偏差在-12%～26%和-28%～10%。当总输出流量> 1 000 m L/min时,多点曲线各浓度点重复性<5%。
Based on the study of the influence of the dynamic dilution calibrator in the ambient atmospheric VOCs automatic monitoring system on the error of the instrument test results under the same dilution ratio and different dilution flow conditions,the shortcomings of the current calibrator commonly used in environmental VOCs automatic monitoring are pointed out. 57 kinds of organic compounds of PAMS were selected,the average detection limits and the average back-test deviation of 0. 5 nmol/mol and1. 0 nmol/mol were tested at different dilution total flow rates. The results showed that the average detection limits were 0. 02 ～ 0. 17 nmol/mol and 0. 01 ～ 0. 10 nmol/mol; the average back-test deviation was-12% ～ 26% and-28% ～ 10%,when the total flow rate was ≥1000 m L/min. Meanwhile,when the total flow rate is above 1000 m L/min,the repeatability of each concentration point of the multi-point curve is within 5%.
Based on the study of the influence of the dynamic dilution calibrator in the ambient atmospheric VOCs automatic monitoring system on the error of the instrument test results under the same dilution ratio and different dilution flow conditions,the shortcomings of the current calibrator commonly used in environmental VOCs automatic monitoring are pointed out. 57 kinds of organic compounds of PAMS were selected,the average detection limits and the average back-test deviation of 0. 5 nmol/mol and1. 0 nmol/mol were tested at different dilution total flow rates. The results showed that the average detection limits were 0. 02 ～ 0. 17 nmol/mol and 0. 01 ～ 0. 10 nmol/mol; the average back-test deviation was-12% ～ 26% and-28% ～ 10%,when the total flow rate was ≥1000 m L/min. Meanwhile,when the total flow rate is above 1000 m L/min,the repeatability of each concentration point of the multi-point curve is within 5%.
引文
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[2]景宽，魏强，周一鸣，等．动态气体校准仪的准确性探讨[J]．分析仪器，2015(5):47-51.
[3]陈向辉，刘教民．动态气体校准仪的研究和应用[J]．天津理工学院学报，2002,18(1):54-56.
[4]徐锦昌，吴汉冲．大气自动监测校准中气体流量对仪器示值误差的影响及控制[J]．中国环境监测，2008,24(4):41-45.
[5]张博．试析大气自动监测校准中气体流量对仪器示值误差的影响及控制[J]．经营管理者，2016(4):393.
[6]傅东旭，施会华，朱峰，等．多参数动态气体校准仪的设计与实现[J]．机电工程，2010,27(10):43-50.
[7]刘献辉，周兵利，崔芳云．环境空气自动监测子站的日常维护和管理[J]．安全与环境工程，2009,16(1):31-33.
[8] U. S. EPA. Quality assurance handbook for air pollution measurement systems volume l I:Part I Ambient air quality monitoring program quality system development[M]. Washington D C,1998:3-7.
[9]赵建华，兰华永，陈滋健，等．基于质量流量控制器的多组分动态配气系统研究[J]．自动化仪表，2008,29(2):44-48.