학술논문
便携式原子吸收测汞仪对气态汞的监测方法 / Research on Gaseous Mercury Monitoring Methods Using a Portable Atomic Absorption Mercury Analyzer
Document Type
Academic Journal
Author
Source
环境监控与预警 / Environmental Monitoring and Forewarning. 7(6):26-29
Subject
Language
Chinese
ISSN
1674-6732
Abstract
研究和比较便携式原子吸收测汞仪测定气态汞的两种方法,即富集法和直读法. 结果显示,富集法在一定范围内具有较好的线性相关性,R2 >0.996,当采气体积为12 L时,检出限为5 ng/m3 ,对于高浓度和低浓度气态汞的测定均有较好的稳定性,当气态汞浓度较低时可延长取样时间,增加采样体积,但测定时间较长,适合测定环境空气中的低浓度气态汞.直读法的检出限为0.89 μg/m3 ,且在测定高浓度含汞废气时,表现出较好的稳定性,同时可在持续排放气态汞条件下进行连续测定并读数,适合测定固定污染源排气中的气态汞.
Two methods, i.e., the enrichment method and the direct-reading method, both of which used a portable atomic absorption mercury analyzer , were studied and compared for monitoring of gaseous mercury .The results showed that the enrichment method had a good linearity within a defined range , with R2 >0.996.The detection limit of gaseous mercury in the air was 5 ng/m3 when the sampling volume was 12 L.The enrichment method showed good stability in determining both high and low concentrations of gaseous mercury .When the mercury concentration was low , the sampling time and volume could be extended .However , the analytical time became longer .It was appropriate for the determination of gaseous mercury at low level in the ambient air .The detection limit of the direct-reading method was 0.89 μg/m3 , and this method showed better stability in determining high concentrations of mercury in industrial waste gas .The direct-reading method could be used for continuous determination of gaseous mercury in the process of continuous discharge .Therefore , this method was suitable for determining gaseous mercury from stationary pollution sources .
Two methods, i.e., the enrichment method and the direct-reading method, both of which used a portable atomic absorption mercury analyzer , were studied and compared for monitoring of gaseous mercury .The results showed that the enrichment method had a good linearity within a defined range , with R2 >0.996.The detection limit of gaseous mercury in the air was 5 ng/m3 when the sampling volume was 12 L.The enrichment method showed good stability in determining both high and low concentrations of gaseous mercury .When the mercury concentration was low , the sampling time and volume could be extended .However , the analytical time became longer .It was appropriate for the determination of gaseous mercury at low level in the ambient air .The detection limit of the direct-reading method was 0.89 μg/m3 , and this method showed better stability in determining high concentrations of mercury in industrial waste gas .The direct-reading method could be used for continuous determination of gaseous mercury in the process of continuous discharge .Therefore , this method was suitable for determining gaseous mercury from stationary pollution sources .