Zhou D M, Wang S Q, Chen H M
Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
J Environ Sci (China). 2001 Apr;13(2):153-6.
Adsorption and desorption process of cadmium in red soil (Ferrisols) as well as the influence by media's pH were investigated in detail with and without citric acid and EDTA. Experimental results clearly showed that Cd adsorption in red soil was affected significantly by the coexisted organic chemicals. In the presence of citric acid and EDTA, Cd adsorption in red soil increased with pH in acid media but decreased in high pH one. Further studies placed stress on the adsorbed Cd in red soil which was found to be existed mainly as exchangeable one at pH < 5.5, and desorption rate by 0.10 mol/L NaNO3 gave a peak-shaped curve due to the difference of specifically and nonspecifically adsorbed Cd with pH's change.
详细研究了红壤（铁铝土）中镉的吸附和解吸过程以及介质pH值的影响，同时考察了有无柠檬酸和乙二胺四乙酸（EDTA）的情况。实验结果清楚地表明，红壤中镉的吸附受到共存有机化学物质的显著影响。在柠檬酸和EDTA存在的情况下，红壤中镉的吸附在酸性介质中随pH值升高而增加，但在高pH值介质中则降低。进一步的研究重点关注了红壤中吸附的镉，发现在pH < 5.5时，镉主要以可交换态存在，并且由于特异性吸附和非特异性吸附的镉随pH值变化而产生差异，0.10 mol/L硝酸钠的解吸率呈现出峰形曲线。
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