Measuring Concentrations of Nitrous Acid Gas by the Filter-Pack Sampling Method
Measuring Concentrations of Nitrous Acid Gas by the Filter-Pack Sampling Method
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过滤包采样法测量亚硝酸气体浓度
DOI：
10.11298/taiki1995.42.3_162
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Takunori Kato
中科院分区：
文献类型：
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作者：
I. Noguchi;H. Otsuka;M. Akiyama;Shigekatsu Sakai;Takunori Kato
滤膜法一般用于测定空气中气溶胶、二氧化硫、硝酸气体、盐酸气体、氨气中的可溶性离子成分。在这项研究中，同时测量亚硝酸气体使用双碱浸渍过滤器的过滤包方法被认为是第一次。过滤器包包含五个过滤器，即。例如，聚四氟乙烯过滤器、尼龙过滤器、第一碱浸渍过滤器、第二碱浸渍过滤器和酸化过滤器。在实验室实验中，发现硝酸根和亚硝酸根离子的伪像形成，代表低于1%的二氧化氮浓度，发生在碱浸渍过滤器中。因此，可以通过第二次碱浸滤纸中NO2和NO3的含量来估计对二氧化氮的干扰。这一原理类似于环形扩散管法。此外，从2003年10月开始，在实地进行了为期三年半的平行调查，使用了通常用于测量亚硝酸气体的过滤包法和环形扩散管法。这样做是为了测量札幌每周的亚硝酸气体浓度。结果表明，两种方法测得的亚硝酸浓度具有良好的相关性（r= 0.95），且相关曲线斜率接近1.0，截距较小：i.例如，y= 1.09x+ 2.28。因此，得出的结论是，过滤包方法是有用的监测空气污染物，包括亚硝酸气体一样，环形扩散管方法。
The filterpack method is generally used for the measurement of soluble ion components in aerosol, sulfur dioxide, nitric acid gas, hydrocloric acid gas, and ammonia gas in the air. In this study, the simultaneous measurement of nitrous acid gas using double alkaline impregnated filters of the filterpack method is being considered for the first time. The filter pack contains five filters, i. e., a Teflon filter, a nylon filter, a firstalkalineimpregnated filter, a second alkalineimpregnated filter, and an acidimpregnated filter. In a laboratory experiment, it was found that artifact formation of nitrate and nitrite ions, representing below 1% of the concentration of nitrogen dioxides, occurs in the alkalineimpregnated filter. Thus, the interference on nitrogen dioxides can be estimated from the NO2 and NO3 content of the second alkalineimpregnated filter. This principle is similar to that of an annular denuder method. In addition, a parallel survey using the filter-pack method and the annular denuder method, which is generally used for the measurement of nitrous acid gas, was carried out in the field for three and half years beginning in October 2003. This was done in order to measure the weekly concentrations of nitrous acid gas in Sapporo. The results showed that nitrous acid concentrations obtained using the two methods were in good agreement because both concentrations were highly correlated (r= 0.95); moreover the slope of the correlation curve was close to 1.0, and the intercept was shown to be small: i. e., y= 1.09x+ 2.28. Thus, it was concluded that the filter-pack method is useful for the monitoring of air pollutants including nitrous acid gas like an annular denuder method.