柠檬酸对改良紫色土中老化铜的淋洗研究  

作　　者：王梦圆 李敏 李文斌 孟昭福[3] 

机构地区：[1]南阳市环境应急与事故调查中心,河南南阳473000 [2]西华师范大学环境科学与工程学院,四川南充637009 [3]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《环境保护与循环经济》2022年第7期37-39,共3页environmental protection and circular economy

基　　金：四川省科技厅项目(2018JY0224);国家自然科学基金(41271244)。

摘　　要：以不同浓度柠檬酸(0,0.05,0.10,0.25,0.50 mol/L)对几种老化后紫色土中的铜进行淋洗,分析淋洗液浓度和次数对铜淋洗率与形态变化的影响。结果显示,土样中铜淋洗率在前60 min前后分为快速和慢速反应阶段,且改良紫色土中铜的淋洗率相比原始土样更高。当淋洗剂的浓度为0.50 mol/L时,紫色土和改良紫色土中铜的淋洗效果均最好。土样首次淋洗时的铜淋洗率最高可达到73.08%,随着淋洗次数的增加淋洗率逐渐降低。相比原始土样,改良土样淋洗出的铜含量整体较多,且淋洗出的有机结合态铜含量显著降低、离子交换态铜含量升高。Different concentrations of citric acid(0,0.05,0.1,0.25 mol/L and 0.5 mol/L)were used to leach copper from several aged purple soils,the effects of the concentration and times of eluent on the elution rate and morphology of copper were analyzed.The results showed that the leaching rate of Cu in soil samples before and after the first 60 min was divided into fast and slow reaction stage,and the leaching rate of improved soil sample was higher than that of original soil sample.When the concentration of eluent is 0.5 mol/L,the leaching effect of copper in purple soil and improved purple soil is the best.The highest copper leaching rate of soil samples was 73.08%at the first time,the leaching rate gradually decreased with the increase of leaching times.Compared with the original soil sample,the improved soil sample leached more copper.The organically bound copper decreased significantly,while the content of ion-exchange copper increased.

关 键 词：柠檬酸 紫色土 老化 铜 淋洗率 

分 类 号：X53[环境科学与工程—环境工程]