有机酸影响下三种铜制剂污染棕壤中铜解吸行为  

Desorption behavior of copper in three kinds of copper-based pesticides contaminated Burozem affected by organic acid

作　　者：徐钰[1] 张民[1] 

机构地区：[1]山东农业大学资源与环境学院作物生物学国家重点实验室,泰安271018

出　　处：《农业工程学报》2008年第S1期43-47,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家"948"项目(201054);教育部"高等学校骨干教师资助计划"[教技司(2000)65号]

摘　　要：该文研究了草酸和柠檬酸对3种铜制剂(美国Kocide2000、波尔多液营养保护剂、硫酸铜)污染土壤中Cu2+的解吸及介质条件(如浓度、pH值、温度等)对其解吸的影响。结果表明,随有机酸浓度升高,草酸和柠檬酸对3种铜制剂污染土壤中Cu2+的解吸率增加,尤以柠檬酸对Cu2+解吸的促进作用最强。随着解吸液pH值的升高,草酸体系中污染土壤中Cu2+的解吸率降低;而柠檬酸体系中污染土壤Cu2+的解吸率呈降低-升高-降低的变化。升高温度,柠檬酸可降低Cu2+的解吸率,而草酸则起增加作用。3种铜制剂污染土壤中Cu2+的解吸速率均较快,在30min左右基本达到平衡,尤以柠檬酸存在时污染土壤Cu2+的解吸速率最大。描述铜制剂污染土壤Cu2+解吸动力学过程的最优模型为Elovich方程。任何条件下,3种铜制剂污染土壤中均以波尔多液营养保护剂污染土壤中Cu2+的解吸量最少,亦对土壤环境的影响最小。Effects of oxalic acid and citric acid on Cu2 +desorption from soils contaminated by three kinds of copper-based pesticides(Kocide 2000(KCD),Bordeaux nutrition protective powder(BNPP)and copper sulfate(CS)) were studied.Results showed that the desorption ratio of Cu 2+ from soils contaminated by three copper-based pesticides was increased with the increasing of concentration of oxalic acid and citric acid,especially of citric acid.Effects of oxalic acid and citric acid on Cu 2+ desorption ratio varied with the pH value of desorption solution.As pH value of desorption solutions increased,Cu 2+ desorption ratio decreased as oxalic acid was added into soil;in contrast,when citric acid was added into the tested soil,Cu 2+ desorption ratio decreased at first,then increased and then decreased again, showing as of lying'S'-shape.With the increase of temperature,citric acid promoted desorption ratio of Cu2 +,while oxalic acid inhibited desorption ratio of Cu 2+ .Cu 2+ desorption ratio from copper-based pesticides contaminated soil was desorpted so fast that the desorption equilibrium could be reached only after 30 min desorption.Comparing with oxalic acid,desorption ratio was greater when citric acid was used.The best model to describe Cu2 +desorption kinetics was Elovich equation.The Cu 2+ desorption ratio for three contaminated soil was CS>KCD>BNPP,and thus soil environment was least effected by BNPP.

关 键 词：有机酸 铜制剂 棕壤 解吸行为 动力学 

分 类 号：X53[环境科学与工程—环境工程]