摘要
目的:建立石墨炉原子吸收快速测定婴幼儿配方乳粉中铅的方法。方法:婴幼儿配方乳粉经0.2%硝酸水溶液稀释,震荡摇匀后定容,注入石墨炉中,同时加入10%硝酸基体改进剂,应用石墨炉原子吸收法测定样品中铅含量。结果:铅浓度在0μg/L～50μg/L范围内线性关系良好,回归方程为Y=2.01×10-3X+4.76×10-6,相关系数r=0.9992,检出限为0.015 mg/kg,相对标准偏差≤7.8%,加标回收率在94.7%～98.0%之间。结论:样品前处理简单方便,大部分操作由自动进样器在线完成,避免了前处理的污染,标准与样品出峰时间和出峰峰型一致,背景基本被消除,定量结果准确可靠。
Objective：To establish a method for the determination of lead in formula milk powder for infant and young children by direct dissolution of sample - graphite furnace atomic absorption spectrometry （GFAAS）. Meth- ods ： The milk powder was dissolved with 0.2% nitric acid, and then lead in the solution was determined by GFAAS with 10% HNO3as matrix modifier. Results： The linear range of the method was 0 μg/L -50 μg/L and the linear regression equation was Y =2.01 × 10-3X ＋4.76 × 10-6 with the correlation coefficient r = 0. 9992. The detection limit of the method was 0. 015 mg/kg and the RSD was≤7.8% with the recoveries of 94.7% -98.0%. Conclu- sion： Sample preparation was simple and convenient, and most operation was finished by auto sampler, so the possi- bility of lead pollution was reduced. The peaktime and type of sample were consistent with the standard, and the background absorption had been eliminated, so the quantitative results were accurate and reliable.
出处
《中国卫生检验杂志》
北大核心
2013年第2期324-326,共3页
Chinese Journal of Health Laboratory Technology
关键词
石墨炉原子吸收法
乳粉
铅
Graphite Furnace Atomic Absorption Spectrometry
Milk powder
Lead
