Cadmium Dissolution Property of Cadmium Polluted Smectitic Paddy Soil Using the Acid Solution
Cadmium Dissolution Property of Cadmium Polluted Smectitic Paddy Soil Using the Acid Solution
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酸性溶液对镉污染蒙脱石水稻土镉的溶出特性
DOI：
10.11362/jcssjnendokagaku1961.41.196
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Wada
中科院分区：
文献类型：
--
作者：
Y. Mori;S. Wada
用0 ~ 100 mmol L ~（-1）硝酸溶液从含6.8 mg kg ~（-1）总吸附镉的水稻土中提取镉（Cd），并利用一个简单的数值模型，结合阳离子交换和表面络合反应，对影响镉提取率的因素进行了研究。50 m L：10 g.萃取率随硝酸浓度的增加而增加，即，5 mmol L-1时的5%~ 100 mmol L-1时的95%，而提取时间对提取率无显著影响。该模型定性地预测了萃取率的变化趋势，并表明层状硅酸盐矿物上的阳离子交换位点是Cd的主要保留位点，特别是当萃取酸浓度较高时。但模型预测值远小于实验值，表明土壤矿物中溶出的铝离子可能在层状硅酸盐矿物上的Cd交换中起作用。
Adsorbed cadmium (Cd) in a smectitic paddy soil was extracted with dilute nitric acid solutions and the factors controlling the extractability of Cd was evaluated with the aid of a simple numerical model to which cation exchange and surface complexation reactions were incorporated.Cd was extracted from a paddy soil containing 6.8mg kg-1of total adsorbed Cd with 0 to 100 mmol L-1nitric acid solutions at a solution: soil ratio of 50m L: 10g. The extraction percentage increased as nitric acid concentration increased, i.e., from 5% at 5 mmol L-1to 95% at 100 mmol L-1, whereas extracting time didnot significantly affect the extraction percentage. The model predicted the trend of the extraction percentage qualitatively and suggested that the cation exchange sites on layer silicate minerals are the major Cd retention sites particularly when the extracting acid concentration was high. However, the model prediction was far less than the experimental values, indicating possible role of aluminum ions dissolved from soil minerals in Cd-exchange on layer silicate minerals.