拡散スクラバーを用いる低濃度アンモニア及び硝酸ガスの捕集と粒子状物質の分別捕集への応用

概要

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A diffusion scrubber system equipped with an ion chromatograph (IC) was used for the collection and determination of gaseous NH_3 and HNO_3 at 100〜200 ppb levels. Purified water was used as the absorbing solution of the scrubber. The gaseous HNO_3 concentration was measured by the impinger trap-IC method and/or the reduction (to NO_x)-chemiluminescence method. The gaseous NH_3 concentration was measured by the impinger trap (boric acid solution)-IC method. The determined collection efficiencies were more than 97.4% for HNO_3 and more than 92.3% for NH_3 under a relative humidity of 0〜70%. The relative standard deviations were less than 1.1% (n=5) for successive collection and analysis. It was confirmed that this system can determine gaseous HNO_3 and NH_3 correctly even in the presence of ammonium nitrate particles.
社団法人日本分析化学会の論文
1997-11-05