应用电感耦合等离子体质谱法测定紫菜、海带中铅、镉含量

Application of inductively coupled plasma-mass spectrometry for determination of lead and cadmium in laver and kelp

目的:应用电感耦合等离子体质谱法(ICP-MS)测定紫菜、海带中铅、镉含量。方法:用微波消解进行样品前处理,以In,Bi作内标,采用电感耦合等离子体质谱法测定紫菜、海带中铅、镉含量。结果:线性范围宽,相关系数大于0.999;方法的相对标准偏差小于等于6%;方法的准确度:选择美国标准物质牡蛎(NBS1566)、贻贝(GBW08571),分别测定Pb、Cd含量,测定值均在标准值范围内。结论:电感耦合等离子体质谱法(ICP-MS)测定紫菜、海带中铅、镉含量,方法简单、快速、灵敏度高、线性范围宽、干扰少。

Objective：To determine the content of lead and cadmium in laver and kelp samples by the inductively coupled plasmamass spectrometry（ ICP- MS）. Methods：The content of lead, cadmium in laver and kelp were pretreated by microwave digestion and then analyzed by ICP - MS using In, Bi as an internal standards. Results：The linear correlation coefficients for all elements were r 〉 0. 999. The precision of the methods （RSD） was lower than 6. 0 %. The results were within the range of the standard reference materials of Oyster tissue （NBS1566） and Mussel（ GBW08571 ）. Conclusion：The method is simple, rapid, sensitive and accurate with wide linear range. No interferences have been found.