TOA—MIBK萃取火焰原子吸收法同时测定土壤及蔬菜中铅镉

Simultaneous Determination of Lead and Cadmium in Soils and Vegetables by TOA-MIBK Extraction and Flame Atomic Adsorption Spectrometry

用氢氟酸、硝酸、高氯酸消化土壤样品,干灰化法消解蔬菜样品,用相对TOA—MIBK系统萃取,火焰原子吸收光谱法在同一条件下测定土壤、蔬菜中的铅、镉。在选定条件下,测得土壤铅、镉的相对标准偏差分别为2 3%～4 4%和3 0%～4 3%,蔬菜铅、镉的相对标准偏差分别为2 9%～4 5%和2 6%～4 5%;土壤铅、镉的回收率分别为96%～104%和95%～101%,蔬菜铅、镉的回收率分别为93%～102%和92%～104%。由测定结果得出离公路越近,蔬菜、土壤铅、镉含量越高。

<Abstrcat> Hydrofluoric acid,nitric acid and perchloric acid are used to melt soil samples,and dissolve vegetable samples by (dry-ashing.)Under the same conditions,the lead and cadmium in soils and vegetables are determined by TOA-MIBK extraction and flame atomic adsorption spectrometry.Under the selected conditions,the relative standard deviation of lead and cadmium in soils are 2.3%～4.4%,3.0%～4.3%,and the relative standard devitation of lead and cadmium in vegetables are 2.9%～4.5%,2.6%～4.5%.The recovery rate of lead and cadmium in soils are 96%～104%,95%～101%,and the recovery rate of lead and cadmium in vegetables are 93%～102%,92%～104%.So the conclusion is that vegetables growing nearer the road have higher lead and cadmium contents.