Investigation into atmospheric deposition through precipitation studies at New Delhi (India)

被引：138

作者：

Kulshrestha, UC

Sarkar, AK

Srivastava, SS

Parashar, DC

机构：

[1] NATL PHYS LAB,DIV CHEM,NEW DELHI 110012,INDIA

[2] DAYALBAGH EDUC INST,DEPT CHEM,AGRA 282005,UTTAR PRADESH,INDIA

来源：

ATMOSPHERIC ENVIRONMENT | 1996年 / 30卷 / 24期

关键词：

rain water; bulk deposition; acid rain; sea salt fraction; dust; dry deposition;

D O I：

10.1016/1352-2310(96)00034-9

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Rain water samples were collected during the monsoon of 1994, using automatic wet-only and manual bulk collectors at a height of 30 m above the ground at the National Physical Laboratory, New Delhi. The average pH of the rain water was 5.7 and its chemical composition was dominated by NH4 and SO4. The free acidity of the rain water was found to be due to SO4 rather than NO3 and it was mainly neutralized by NH4 and Ca. Calculation of sea salt fraction and enrichment factor revealed that this site is free for marine influence. On an average the bulk samples had 13% higher concentration than that of wet-only samples which may be due to the deposition of soil-derived particles during the 24 h period of exposure. The higher neutralization Factors of Ca and Mg in bulk samples and highest dry deposition rates for Ca in comparison to other components, indicated the positive interference of dust particles in neutralization. Copyright (C) 1996 Elsevier Science Ltd

引用

页码：4149 / 4154

页数：6

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