摘要
室内模拟实验与盆栽试验的结果表明，外源ＨｇＣｌ２进入土壤后的形态分布为残留态＞酸溶态＞碱溶态与活性态。它们的稳定性依次下降，且随时间的延长，后三种形态的汞逐渐向残留态汞转化。添加ＣａＣＯ３只能在一定的时间和用量范围内影响土壤汞形态分布。
A simulated experiment and a pot test were conducted to study the time-dependent changes of soil mercury fractions and the influence of liming on them.the acid purple soil and the yellow soil were treated on different lime levels but the same HgCl2 level.Hg fractionation was carried out by using the sequential extraction method at 5,14 and 30 days after treatment in the simulated experiment and at 35,320,610 days in the pot test.The different mercury fractions were distributed in the order of residual Hg>acid soluble Hg>alkaline soluble Hg and active Hg after HgCl2 application. Their stability decreased in the same trend,and the other three fractions would gradually transform into residual Hg.The influence of liming on the distribution of mercury fractions occurred only within a certain time range and a proper dose range.
出处
《土壤学报》
CAS
CSCD
北大核心
1996年第1期94-100,共7页
Acta Pedologica Sinica
关键词
土壤
汞
形态分布
时间范围
用量范围
碳酸钙
Dose range
Time range
Distribution of fractions
Liming
Soil mercury
