Analysis of Two-Year Results of Acid Precipitation Survey within Japan
Analysis of Two-Year Results of Acid Precipitation Survey within Japan
复制标题
日本两年酸降水调查结果分析
DOI：
10.1246/bcsj.63.2691
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发表时间：
1990
影响因子：
4
通讯作者：
Ken
中科院分区：
文献类型：
--
作者：
H. Hara;E. Ito;T. Katou;Y. Kitamura;T. Komeiji;M. Oohara;T. Okita;K. Sekiguchi;Keisuke Taguchi;Motonori Tamaki;Yoshio Yamanaka;Ken
为了判断主要离子的浓度和沉积量，对日本境内的降水化学进行了评估：H+、NH 4+、Ca 2+、K+、Mg 2+、Na+、SO 42、NO3−和Cl−。1984年4月至1986年3月，日本环境厅在14个测站进行了酸雨调查。年平均pH值在每个站点的范围从4.5到5.1，平均值为4.7。游离酸度来自硫酸和硝酸;硫酸被发现占游离酸度的67-83%。酸度明显低于SO 42 −和NO3−水平的预期，主要是因为碱性物质，如NH3和Ca 2+物质中和了一定比例的原始酸度。这种中和作用将证明这样一个事实，即SO 42 −和NO3−的沉降量与北美东部相当或小于北美东部，但日本境内的Ca 2+和NH 4+沉降量超过了美国。S.
Precipitation chemistry within Japan has been assessed in order to judge both the magnitudes of the concentrations and the deposition of major ions: H+, NH4+, Ca2+, K+, Mg2+, Na+, SO42, NO3−, and Cl−. A data set was obtained through an acid precipitation survey by Japan Environment Agency at 14 stations from April 1984 to March 1986. The annual average pH at each site ranged from 4.5 to 5.1 with a mean value of 4.7. The free acidity was derived both from sulfuric and nitric acids; sulfuric acid was found to contribute to 67–83% of the free acidity. The acidity was apparently lower than that expected from SO42− and NO3− levels, mainly because alkaline species, such as NH3, and Ca2+ species neutralized a certain fraction of the original acidity. This neutralization would certify the fact that SO42− and NO3− deposition were comparable to, or smaller than those in eastern North America, but the Ca2+ and NH4+ deposition within Japan exceeded that within the U. S.