Storage Stability of Diffusive Samplers and Application to Real Air Samples

YAMADA Tomomi, UCHIYAMA Shigehisa, INABA Yohei, SETO Hiroshi, KUNUGITA Naoki

doi:10.2116/bunsekikagaku.62.603

The storage stabilities of four kinds of diffusive sampling devices, (DSD-DNPH for carbonyls, DSD-OZONE for ozone, DSD-TEA for acid gases and DSD-NH₃ for basic gases), were evaluated. Based on the resulting storage stability, chemical substances found both indoor and outdoor air were measured by using DSD-samplers. Almost all DSD-samplers, except for nitrogen dioxide (DSD-TEA), showed degradation in less than 7.2 % for four weeks at room temperature. The storage stability of nitrogen dioxide collected in the DSD-TEA showed degradation in 9 % for four weeks at room temperature. It is suggested that nitrite was oxidized to nitrate during the storage term at room temperature. In measurements of acid gases using DSD-TEA, when the analysis is not performed within two weeks, the samplers should be stored in a refrigerator at 4°C. In applications to real air samples, it was observed that almost all chemical substances, except for nitrogen dioxide, were higher in the summer than in the winter. The mean nitrogen dioxide concentration was significantly higher at 15 times in the winter than in the summer. It was suggested that the primary sources indoors are combustion processes, such as unvented combustion appliances, e.g. gas stoves.

Storage Stability of Diffusive Samplers and Application to Real Air Samples

Bibliographic Information

Search this article

Abstract

Journal

Citations (1)*help

References(15)*help

Related Projects

Keywords

Details 詳細情報について

Export

Report a problem