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首页> 外文期刊>Water, Air, and Soil Pollution >EFFECTS OF ORGANIC ACIDS, o-PHENYLENEDIAMINE AND PYROCATECHOL ON CADMIUM ADSORPTION AND DESORPTION IN SOIL
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EFFECTS OF ORGANIC ACIDS, o-PHENYLENEDIAMINE AND PYROCATECHOL ON CADMIUM ADSORPTION AND DESORPTION IN SOIL

机译：有机酸，邻苯二胺和邻苯二酚对土壤中镉的吸附和脱附的影响

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This article studied the interaction of cadmium (Cd) and low molecular weight organics in Indicotic black (IB) soil. Cadmium adsorption isotherm in this soil was satisfactorily simulated using Freundlich equation as Q = 905.6C~(0.49) with high correlation (r~2 = 0.984), and its adsorption quantity increased with increasing pH. The presence of citric acid and EDTA significantly reduced Cd adsorption in soil, which was due to the formation of soluble Cd-organic complex. Concentration of cadmium ions in equilibrium solution was determined and percentages of [CdH_2Cit~+]/[Cd-complex Total], [CdHCitl/[Cd-eomplex Total] and [CdCit~-]/[Cd-complex Total] vs. pH were successfully calculated. Desorption percentage of Cd, adsorbed in the presence of citric acid and EDTA decreased, compared with that adsorbed in NaNO_3 media. It suggests that free sites for Cd adsorption in soil increased in the presence of organic acid. When o-phenylenediamine, pyrocatechol and aminocthonic acid appeared in Cd equilibrium media, Cd adsorption quantity increased by increasing cation exchange of positively charged cadmium complex with soil at low pH. Compared with that performed in the absence of these organics, the exchangeable Cd, desorbed by 0.1 mol L~(-1) NaNO_3, reduced obviously, which suggests that Cd-complex was more difficult to be desorbed than Cd~(2+). Moreover, % Cd desorbed was linearly correlated with the reverse of the total Cd adsorption under unsaturated adsorption.
机译：本文研究了镉（Cd）和低分子有机物在美洲黑（IB）土壤中的相互作用。使用Freundlich方程Q = 905.6C〜（0.49）具有高相关性（r〜2 = 0.984）令人满意地模拟了该土壤中镉的吸附等温线，并且其吸附量随pH值的增加而增加。柠檬酸和EDTA的存在显着降低了土壤中Cd的吸附，这是由于形成了可溶性Cd-有机配合物。确定平衡溶液中镉离子的浓度，[CdH_2Cit〜+] / [Cd-络合物总量]，[CdHCitl / [Cd-络合物总量]和[CdCit〜-] / [Cd-络合物总量]的百分比与pH的关系被成功计算。与NaNO_3介质相比，在柠檬酸和EDTA存在下吸附的Cd的解吸百分比降低。这表明，在有机酸存在下，土壤中Cd吸附的自由位点增加。当邻苯二胺，邻苯二酚和氨基甲酸在Cd平衡介质中出现时，Cd的吸附量通过在低pH下增加带正电的镉配合物与土壤的阳离子交换而增加。与不存在这些有机物的情况相比，被0.1 mol L〜（-1）NaNO_3解吸的可交换Cd明显减少，这表明Cd络合物比Cd〜（2+）更难于解吸。此外，在不饱和吸附下，解吸的Cd百分比与总Cd吸附量的倒数线性相关。

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