黄棕壤中活性有机碳对Cu吸附的影响

通过盐酸酸化法来去除4种不同利用方式黄棕壤的活性有机碳(AOC),得到相对稳定的有机碳土壤,用于研究去除活性有机碳前后对Cu2+吸附行为的影响.结果表明,黄棕壤去除有机碳前后,对Cu2+吸附量与平衡液浓度的关系符合Langmuir方程和Freundlich方程,其拟合都呈现极显著相关(P＜0.01),去除AOC后,黄棕壤各层次对Cu2+的最大吸附量明显降低,是原土Cu2+最大吸附量的10％～30％.盐酸酸化法对4种不同利用方式的黄棕壤有机碳的去除率为30％～75％,对Cu2+吸附的减少率为54％～86％.去除活性有机碳前后,有机碳含量与对Cu2+的吸附量都呈显著线性相关.土壤有机碳的去除率与对Cu2+吸附的减少率间相关性达到极显著水平.

Effect of Active Organic Carbon on Cu Adsorption in Yellow Brown Soils

Active organic carbon was removed by HCl acidification in yellow brown soils under different patterns of land use and relatively stable soil organic carbon sample was obtained.The effect of active organic carbon(AOC) by HCl removed on Cu adsorption was studied.It showed that before and after removal of active organic carbon,Cu adsorption by yellow brown soil could be fit well with both Langmuir and Freundlich equations and reached a significant correlation(P<0.01).After removing AOC,the maximum adsorption capacity obviously reduced in every layers of yellow brown soil,and was about 10%~30% of original soil.Removal rate of organic carbon was between 30% and 50% with HCl acidification in yellow brown soils,and Cu adsorption rate reduced between 54% and 86%.Before and after removal of active organic carbon,the linear correlation was very significant between organic carbon contents and Cu adsorption capacities.Furthermore,there was an extremely significant level between the removal percentages of organic carbon and decrement rate of Cu adsorption in yellow brown soils.