HG-FAAS DETERMINATION OF TRACE AMOUNTS OF LEAD IN VEGETABLES
摘 要
采用微波消化、氢化物发生-原子吸收光谱法测定蔬菜中痕量铅.研究了硼氢化钾用量、酸介质及其酸度对铅的测定影响,采用铁氰化钾-草酸体系可消除金属元素对铅测定的干扰.检出限为0.023 μg·L-1,回收率为97.8%-105.6%,RSD为0.8%-1.8%,线性范围为0-40 μg·L-1.
Abstract
Atomic absorption spectrometry,hyphenated with hydride generation technique,was applied to the determination of traces of lead in vegetables.The sample,after washing and grinding,was digested with HNO3 and H2O2 by heating in a microwave oven.The effects of varieties of acid and acidity of the sample solution and the amount of potassium borohydride used in the hydride generation reaction on the magnitude of the absorbancy of atomic absorption were studied.The interferences of co-existing ions in the sample were eliminated effectively by the addition of solutions of K3Fe(CN)6 and oxalic acid.Linear relationship between the absorbance and concentration of Pb2+ ion in the range of 0 to 40 μg·L-1 was obtained.The precision test with 20 μg·L-1 of Pb2+ for 7 determinations gave a value of RSD of 1.5%.The detection limit (3S) of the method was found to be 0.023 μg·L-1.In application of the method to the analysis of several kinds of vegetable samples,recoveries in the range of 978% to 105.6% were obtained.
中图分类号 O657.31
所属栏目 工作简报
基金项目 中北大学校基金资助
收稿日期 2004/11/16
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备注白红娟(1969-),女,山西太原人,副教授,博士生,主要从事微生物“三废”治理及环境监测方面的研究.
引用该论文: BAI Hong-juan. HG-FAAS DETERMINATION OF TRACE AMOUNTS OF LEAD IN VEGETABLES[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2006, 42(5): 355~356
白红娟. 氢化物发生-原子吸收光谱法测定蔬菜中痕量铅[J]. 理化检验-化学分册, 2006, 42(5): 355~356
被引情况:
【1】陆建平,布静龙,覃梦琳,卢秀芳,李广良,梁海青, "黄原酯棉纤维柱分离-氢化物发生-原子荧光光谱法测定大米中的镉和铅量",理化检验-化学分册 52, 147-150(2016)
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【2】Wallace A,Shimada T,Hagston W,et al.Dose Response Curves for Zinc,Cadmium and Nickel in Combinations of One,Two or Three[J].Soil Sci,1989,147(6):401-410.
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