| 土壤溶液中镉的化学形态及化学平衡研究 |
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| 引用本文： | 熊礼明.土壤溶液中镉的化学形态及化学平衡研究[J].环境科学学报,1993,13(2):150-156. |
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| 作者姓名： | 熊礼明 |
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| 作者单位： | 中国科学院南京土壤研究所 210008 |
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| 摘 要： | 据土壤溶液的实际情况建立简便的平衡模式,研究了红壤、黄棕壤、黄潮土三种典型土壤溶液中Cd的化学形态和化学平衡.结果表明,溶液中Cd的主要形态为Cd~(2+)、CdCl~+和CdSO_4~6.黄潮土还有一定量的CdHCO_3~+,其它形态Cd很少,其中游离Cd~(2+)占绝大部分.红壤最高,黄棕壤次之.红壤施石灰后游离Cd~(2+)下降,CdSO_4~6增加;添加氯化物后,溶液pH下降,大量Cd进入溶液中,CdCl~+比例明显升高.溶液中Cd的形态分布与土壤Cd的生物有效性有一定关系.此外,溶解度图证明,供试土壤中不可能有Cd的矿物生成.Cd在固液相间的平衡受吸附解吸反应控制.
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| 关 键 词： | 土壤 溶液 化学形态 化学平衡 镉 |
| 收稿时间： | 6/5/1991 12:00:00 AM |
CHEMICAL SPECIES AND EQUILIBRIA OF CADMIUM IN SOIL SOLUTIONS |
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| Xiong Liming.CHEMICAL SPECIES AND EQUILIBRIA OF CADMIUM IN SOIL SOLUTIONS[J].Acta Scientiae Circumstantiae,1993,13(2):150-156. |
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| Authors: | Xiong Liming |
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| Affiliation: | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 |
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| Abstract: | A simple chemical equilibrium model was developed to speciate Cd in soil solutions of red earth, yellow-brown earth and yellow fluro-aquic soil peviously amended with Cd. Results showed that Cd2+, CdCl+, and CdSO40 were the dominant species of Cd in soil solution. Limimg the red earth reduced free Cd2+ and increased CdSO40 in the species composition. Adding chlorides decreased soil pH and desorbed Cd from solid matrix, and CdCl+ and CdCl20 rised dramatically. Solubility diagram suggested that the soil solution was far undersaturated with respect to all Cd minerals hence Cd activity in soil solution was controlled by sorption-desorption equilibrium of Cd between soil solid and solution phases. |
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| Keywords: | cadmium chemical equilibrium model soil solution species |
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