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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >IMPROVEMENT OF THE TETRACHLOROMERCURATE ABSORPTION TECHNIQUE FOR MEASURING LOW ATMOSPHERIC SO2 MIXING RATIOS
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IMPROVEMENT OF THE TETRACHLOROMERCURATE ABSORPTION TECHNIQUE FOR MEASURING LOW ATMOSPHERIC SO2 MIXING RATIOS

机译：四氢键吸收法测量低浓度SO2混合比的改进

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摘要

During the Gas-Phase Sulfur Intercomparison Experiment (GASIE) in 1994 an analytical system for measuring sulfur dioxide mixing ratios at low parts per trillion (pptv) levels was employed. It is based on the absorption of SO2 on a tetrachloromercurate(II)-impregnated filter. The subsequent analysis uses a chemiluminescence reaction by treating the resulting disulfitomercurate(II) complex with an acidic cerium sulfate solution. An improved sampling device has been introduced that increases the maximum sampling volume from 200 L to 500 L. It is also possible to determine the blank value accurately for each sample. The absorption efficiency of the sampling system is 98.7 +/- 6.4% at a nominal flow rate of 10 L/min. The calculated (3 sigma) detection limit is 3 +/- 1 pptv SO2. The sample solution is stable for up to 30 days, which allows the samples to be safely stored or shipped before analysis. This permits the use of a sensitive, compact, and reliable sampling system in the field with subsequent analysis under optimal conditions in the laboratory. A continuous flow chemiluminescence (CFCL) analyzer fbr on-line measurements is also presented. The system is based on the same chemical principles as the described filter technique. [References: 17]
机译：在1994年的气相硫比较试验（GASIE）中，使用了一种分析系统，用于以低万亿分之一（pptv）的水平测量二氧化硫混合比。它基于四氯化汞（II）浸渍的过滤器对SO2的吸收。随后的分析使用化学发光反应，方法是用酸性硫酸铈溶液处理所得的二硫代乙酸酯（II）配合物。引入了一种改进的采样设备，可将最大采样体积从200 L增加到500L。还可以为每个样品准确确定空白值。在10 L / min的额定流速下，采样系统的吸收效率为98.7 +/- 6.4％。计算得出的（3 sigma）检测限为3 +/- 1 pptv SO2。样品溶液最多可稳定保存30天，从而可以在分析之前安全地存储或运输样品。这样就可以在现场使用灵敏，紧凑和可靠的采样系统，然后在实验室的最佳条件下进行后续分析。还提供了在线测量的连续流化学发光（CFCL）分析仪。该系统基于与所描述的过滤技术相同的化学原理。 [参考：17]

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