ATMOSPHERIC H2O2 FIELD-MEASUREMENTS IN A TROPICAL ENVIRONMENT - BAHIA, BRAZIL

被引：45

作者：

JACOB, P ^{[1
]}

TAVARES, TM ^{[1
]}

ROCHA, VC ^{[1
]}

KLOCKOW, D ^{[1
]}

机构：

[1] UNIV FED BAHIA,INST QUIM,BR-40210 SALVADOR,BA,BRAZIL

来源：

ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS | 1990年 / 24卷 / 02期

关键词：

cryo sampling; gas/liquid distribution; Hydrogen peroxide; tropical environment;

D O I：

10.1016/0960-1686(90)90117-6

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Concentrations of H2O2 in atmospheric gas and liquid phases were determined for the first time in the tropical Southern Hemisphere. Measurements were carried out in the Salvador area, Bahia, 13°S, 38°W) both at the seaside and 500 m away from it as well as at 270 km inland, in a rural area, during March-April 1988. Gaseous H2O2 was collected by cryogenic and rain by wet only sampling. Analyses were performed with the peroxyoxalate chemiluminescence method, employing a compact field apparatus. The measured gas phase concentrations ranged from 0.2 to 3.9 ppbv compared to 0.01-0.6 ppbv obtained from measurements with similar methodology in Dortmund (51°30'N, 7°30'E), F.R.G, during summer. The corresponding concentration ranges in rainwater are 0.9-6.8 ppmw (Bahia) and 0.1-2.2 ppmw (Dortmund, summertime). Gas/liquid H2O2 equilibrium during rain events is only attained at precipitation rates below 1 mm h-1. © 1990.

引用

页码：377 / 382

页数：6

共 36 条

[1] IMPORTANCE OF FORMALDEHYDE IN CLOUD CHEMISTRY [J].