同一种前处理方法测定烟草中砷、铅和镉

采用同一种前处理方法即硝酸和高氯酸消解处理烟草样品后,氢化物发生-原子荧光光谱法测定烟叶中砷、铅;原子吸收光谱法测定烟叶中镉。样品溶液介质为10%的盐酸,对7个样品平行3次重复实验,其相对标准偏差为砷:0.81%—4.96%、铅:2.82%—5.83%、镉:0.96%—4.60%,砷、铅、镉的检测线性范围分别为:0.0—120.0、0.0—60.Oμg·L^-1和0.0—800.0μg·L^-1,加标回收率:砷在94.5%—96.9%之间、铅在92.7%—101.6%之间、镉在102.2%—110.9%之间。

Determination of Arsenic ,Lead and Cadmium in Tobacco by the Identical Pretreatment Method

With the identical pretreatment method for digestion of tobacco samples by nitric acid and the perchloric acid,leaf and arsenic in the tobacco were determined by hydride generation-atomic fluorescence spectrometry,and cadmium was determined by atomic absorption spectrometry.The solution medium of treated samples was hydrochloric acid with volume concentration of 10%,and seven samples were paralleled for 3 times determination,then RSDs of arsenic,lead and cadmium were in the range of 0.81%—4.96%,2.82%—5.83%and 0.96%—4.60%,respectively.The detection ranges of arsenic,lead and cadmium were 0.0—120.0μg·L^-1,0.0—60.0μg·L^-1 and 0.0—800.0μg·L^-1,respectively.The additional recoveries of arsenic,lead and cadmium were 94.5%—96.9%,92.7%—101.6%and 102.2%—110.9%,respectively.