几种土壤对砷酸盐的吸附

砷化合物一般都具有毒性,它对环境的污染引起人们的重视.砷污染土壤后,被土壤吸附、贮存.同时,通过植物的摄取,可进入动物和人体中.植物吸收的砷量和受害的程度,不仅与土壤砷的水平有关,而且还受土壤吸附砷的状况的影响.中国科学院南京土壤研究所试验研究指出,按土壤对砷的吸附量的差异而规定各种土壤的最大允许残留量.

ADSORPTION OF ARSENATE BY SOILS

The present paper deals with a comparison of regression equations for describing arsenate adsorption by soils.Five soils including manured loessial soil,loessial soil and yellow brown earth collected from Shaanxi Province were used in experiment.The results obtatined has shown that Freundliche equation fits better for the experimental data than those and the revised ones of Temkin and Langmuir.The As adsorption curve derived from Freundliche equation is identical with the trend of variation of As adsorption measured directly,its standard deviation (S) is minimum(4.3-39.4),and the correlation coefficient (R²)is maximum(0.91-0.99).The curves derived from other equations differ greatly from their respective values measured directly.