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...
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2007年第12期1024-1026,1029,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
试样预处理
试样微波消解
铅
镉
土壤
Sample pretreatment
Microwave assisted sample digestion
Lead
Cadmium
Soil
