摘要
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.
出处
《四川环境》
2005年第3期44-46,共3页
Sichuan Environment
关键词
火焰原子吸收光谱法
萃取
蔬菜
土壤
铅
镉
Flame atomic adsorption spectrometry
extraction
vegetable
soil
lead
cadmium