引用本文:田新愿,张健,饶正勇,秦兴章,晁良俊.动态稀释校准仪对VOCs自动监测系统的影响[J].环境监控与预警,2019,11(4):28-31
TIAN Xin-yuan, ZHANG Jian, RAO Zheng-yong, QIN Xing-zhang, CHAO Liang-jun.Influence of Dynamic Dilution Calibrator on VOCs Automatic Monitoring System[J].Environmental Monitoring and Forewarning,2019,11(4):28-31
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动态稀释校准仪对VOCs自动监测系统的影响
田新愿,张健,饶正勇,秦兴章,晁良俊
上海贝瑟环保科技有限公司,上海 200233
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 mL/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 mL/min时,多点曲线各浓度点重复性<5%。
关键词:  动态稀释校准仪  稀释比  稀释流量  自动监测系统  挥发性有机物
DOI:
分类号:X831;X851
文献标识码:B
基金项目:
Influence of Dynamic Dilution Calibrator on VOCs Automatic Monitoring System
TIAN Xin-yuan, ZHANG Jian, RAO Zheng-yong, QIN Xing-zhang, CHAO Liang-jun
Shanghai Besser Environmental Technology Co. Ltd., Shanghai 200233,China
Abstract:
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 and 1.0 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 mL/min. Meanwhile, when the total flow rate is above 1000 mL/min, the repeatability of each concentration point of the multi-point curve is within 5%.
Key words:  Dynamic dilution calibrator  Dilution ratio  Dilution flow  Automatic monitoring system  VOCs