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pH对镉在土水系统中的迁移和形态的影响
引用本文:廖敏,黄昌勇,谢正苗.pH对镉在土水系统中的迁移和形态的影响[J].环境科学学报,1999,19(1):81-86.
作者姓名:廖敏  黄昌勇  谢正苗
作者单位:浙江农业大学环境资源学院土化系
基金项目:中国科学院资助项目,49601013,
摘    要:研究了4种红壤和水体系中PH对镉的迁移影响,结果表明:镉在土水体系中的迁移是一快反就过程,4种土壤对镉的吸附量随土水系统中PH的变化,可分为3个区域,即低吸附量区、中等吸附区,以及强吸附和沉淀区。

关 键 词:PH    土壤  水体  迁移  污染物质  污染源
收稿时间:1997/5/19 0:00:00
修稿时间:1997/11/17 0:00:00

Effect of pH on transport and transformation of cadmium in soil water system
LIAO Min,HUANG Changyong and XIE Zhengmiao.Effect of pH on transport and transformation of cadmium in soil water system[J].Acta Scientiae Circumstantiae,1999,19(1):81-86.
Authors:LIAO Min  HUANG Changyong and XIE Zhengmiao
Affiliation:Zhejiang Agricultural University, Hangzhou 310029,Zhejiang Agricultural University, Hangzhou 310029 and Zhejiang Agricultural University, Hangzhou 310029
Abstract:Effects of pH on transport and transformation of cadmium in soil water systems were studied. The results showed that the transport of cadmium in the soil water systems was a fast process.The variation in absorption capacity for cadmium with pH showed three distinct stages,i.e.,low adsorption stage at pH<ZPC,stable adsorption stage at ZPC<pH<6.0 and strong adsorption and precipitation stage at pH>6.0.Adsorption capacity for cadmium was positively correlated with pH at the stable adsorption stage.The bioavailability of adsorbed cadmium increased with pH when pH<6 while decreased with pH when pH>6. At pH value of 7.5,large perceentages of cadmium were bound to clays and oxides,reducing its toxicity.
Keywords:pH  cadmium  soil  water  transport  
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