螯合剂对镉在土壤和紫花苜蓿中积累的影响研究  

Study of Enrichment for Cd in Alfalfa from Three Agents

作　　者：任丽娟[1] 柴琳琳[1] 郭昱[1] 李玲[1] 

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046

出　　处：《新疆大学学报（自然科学版）》2015年第3期330-335,共6页Journal of Xinjiang University(Natural Science Edition)

基　　金：国家自然科学基金项目(21467029)资助

摘　　要：通过室内静态吸附和盆栽实验,以新疆干旱区某石化污水库周边农田土为研究对象,考察了没食子酸(GA)、EDTA、柠檬酸(CA)对土壤中镉(Cd)的形态分布及Cd在紫花苜蓿中迁移规律的影响.结果表明:(1)在螯合剂考察浓度范围内(0～15 mmol/kg),三种螯合剂的投加均可提升水溶态Cd含量,且EDTA为15.0 mmol/kg时,水溶态Cd含量达到最大值;与对照相比,三种螯合剂均可提升可交换态Cd含量,但增幅差异不大.(2)投加(0～1.0 mmol/kg)螯合剂可显著提升Cd在紫花苜蓿中的富集量.其中,三种螯合剂对紫花苜蓿根、茎中Cd富集量的提升作用大小顺序为EDTA>GA>CA;与EDTA、CA相比,投加1.0 mmol/kg GA时,紫花苜蓿叶中Cd的富集量具有较大值.(3)通过比较转运系数表明,在供试土壤中投加0.25 mmol/kg GA时,Cd在紫花苜蓿中具有较好的转运能力,转运系数大小顺序为:GA>CA>EDTA.The effects of agents at levels 0-15 mmol/kg on various forms scale of cadium in soils was discussed by static adsorption and accumulation from alfalfa was analyzed by pot experiments, which soils collected from arid zoon around petrochemical waste-water reclaimed in Xinjiang .Results showed that：（1） When exogenous agents ranged concentration was 0-15 mmol/kg ,the percentage of water-soluble Cd in soils changed regularly and reached climax when EDTA at level of 15.0 mmol/kg ; contrasted with the blank,percentage of exchangeable Cd were increased slightly when agents increased . （2） Enrichment of Cd were increased greatly when agents at levels 0-1.0 mmol/kg, the promoting effect from agents was contrasted with EDTA〉 GA〉 CA in alfalfa root and stem, the significance of the effect from agents was contrasted with GA 〉 EDTA 〉CA in alfalfa leaf. （3） In general, enrichment coefficients in alfalfa was promoted by three agents. Transformation rate of Cd in alfalfa was reached the maximum values when 0.25 mmol/kg CA added in soils and contrasted With GA〉CA〉EDTA.

关 键 词：螯合剂 紫花苜蓿 CD 植物修复 

分 类 号：X131[环境科学与工程—环境科学]