MDA在3种土壤中的吸附与解吸行为研究

Study on the Adsorption and Desorption of MDA in Three Kinds of Soil

采用振荡平衡实验方法对MDA在黑龙江黑土、江西红壤土和河南黄潮土中的吸附与解吸行为进行了研究。吸附、解吸试验结果表明MDA在3种土壤中的吸附强弱次序为黑龙江黑土>江西红壤土>河南黄潮土,黑龙江黑土中MDA的48h吸附率100.00%,解吸率为0.00%;江西红壤土中MDA的48h吸附率94.74%,解吸率为6.52%;河南黄潮土中MDA的48h吸附率为70.71%,解吸率为10.40%。吸附等温线试验结果表明,黑龙江黑土吸附常数Kd=0.129,有机碳吸附常数Koc=98.923;江西红壤土吸附常数Kd=0.118,有机碳吸附常数Koc=49.838;河南黄潮土吸附常数Kd=0.012,有机碳吸附常数Koc=24.014。

The adsorption and desorption behavior of MDA in Heilongjiang Black Soil,Jiangxi Red Soil,and Henan Yellow Fluvoaquic Soil were compared using oscillating equilibrium experimental method.The results showed that the adsorption strength order of MDA in the soils was Heilongjiang Black Soil 〉Jiangxi Red Soil 〉Henan Yellow Fluvoaquic Soil.The adsorption rate of MDA in forty-eight hours in Heilongjiang Black Soil,Jian-gxi Red Soil and Henan Yellow Fluvoaquic Soil were 100. 00%,94. 74% and 70. 71% respectively.The rates of desorption were 0. 00%,6. 52% and 10. 40%.The adsorption isotherm tests showed that the adsorption constants of Heilongjiang Black Soil,Jiangxi Red Soil,and Henan Yellow Fluvoaquic were 0. 129,0. 118,and 0. 012.The total organic carbon adsorption constants were 98. 923,49. 838,and 24. 014 accordingly.