火焰原子吸收分光光度法测定饲料磷酸氢钙中的Pb的干扰及其消除  

Determination of Pb Interference and Elimination in DCP Feed with Flame Atomic Absorption Spectrophotometry

作　　者：龚联军[1] 胡必明[1] 金岚[1] 

机构地区：[1]自贡鸿鹤化工股份有限公司,四川自贡643000

出　　处：《中国井矿盐》2013年第5期38-42,共5页China Well and Rock Salt

摘　　要：空气—乙炔火焰原子吸收分光光度法测定饲料磷酸氢钙中的Pb存在背景吸收干扰,背景干扰大小与分析测试条件密切相关,确定了背景吸收干扰主要是由水溶液中大量的Ca2+、Mg2+和H3PO4引起,探讨了非吸收线(Pb282.3nm、Pb280.1nm)和连续光源(氘灯)扣除背景吸收的情况;提出以实现标准溶液与待测样品溶液"基体一致"的方法,避免了测定背景吸收。此法测定饲料磷酸氢钙样品中的Pb,操作简便快速,适宜限量测定。There is background absorption mterterence in the determmatmn oi r＇o m LJU＂ IeeO wlm air - acetylene itame atomic absorption speetrophotometry. The strength of background interference is closely related to the anlaysis condition, and this paper ensures that the background absorption interference is mainly caused by Ca2~,Mg2＋ and H3PO4 in water solution.This paper discusses the cases of non-absorption line （Pb282.3nm, Pb280.lnm） and continuous light source （deuterium lamp） offseting background absorption and put forwards the way to achieve the standard solution and the sample solution ＂matrix consistent＂ which avoids the determination of background absorption. This method is easy and fast to carry out Pb determination in the DCP feed and it is fit for limit determination.

关 键 词：背景吸收 分子吸收 磷酸氢钙 Pb干扰 消除 

分 类 号：TS39[轻工技术与工程]