土壤中铅、镉测定的试样预处理方法的改进  

Modification of Method of Sample Pretreatment in the Determination of Lead and Cadmium in Soil

作　　者：杨启霞[1] 韩吉衢[2] 杜旭昌 

机构地区：[1]烟台大学环境与材料工程学院,烟台264005 [2]烟台大学光电技术学院,烟台264005 [3]莱州市锅炉检验所,莱州261400

出　　处：《理化检验（化学分册）》2007年第12期1024-1026,1029,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：作为对GB/T 17140-1997中所列方法的改进,建议用混合酸(VHNO3+VH2O2+VHF=4+2+1)在微波消解仪中消解试样。微波消解的参数也进行了试验并确定了最佳条件,所得试样溶液蒸发至浆状并加盐酸溶解盐类,将试样中的Pb(Ⅱ)、Cd(Ⅱ)以碘化物络阴离子的形式萃取入4-甲基戊酮-2(MIBK)液层中,并在MIBK溶液中用火焰原子吸收光谱法测定铅及镉。试验结果表明:经改进的方法不仅有较高的精密度和准确度,而且操作简便且快速,算得两元素测定结果的相对标准偏差(n=10)均小于5%。测定铅和镉的回收率分别为99.2%和96.4%。As a modification for the method given in GB/T 17140-1997,the pretreatment of soil sample was improved by digesting in an acid mixture of HNO3+H2O2+HF(prepared in the ratio of 4+2+1) and heating in a microwave assisted digestor under specified parameters.The sample solution was evaporated to syrupy consistency and taken up with hydrochloric acid.Lead and cadmium ion in HCl solution were then extracted into 4-methyl-pentanone-2(MIBK) as their iodide anionic complexes,and determined in MIBK-phase by FAAS.As p...

关 键 词：试样预处理 试样微波消解 铅 镉 土壤 

分 类 号：X53[环境科学与工程—环境工程]