摘要
食品营养强化剂样品经硝酸(2+98)溶液溶解,用电感耦合等离子体质谱法测定其中重金属元素铅、砷、镉、汞、铜等的含量。选择钇(测铜及砷)、铑(测铅及镉)及金(测汞)作为内标元素可减小样品的基体效应。测定维生素C样品中汞量时,需加入硫脲作络合剂,使回收率达到正常值。方法的检出限(3S/N)在0.006~0.064μg·L^(-1)之间,各元素的相对标准偏差(n=11)在2.9%~5.9%之间。应用此法测定7种食品营养强化剂中的5种痕量重金属元素,加标回收率在92.0%~105%之间。
The sample of food nutrition fortifier was dissolved in HNOa （2＋98） solution and the contents of Pb, As, Cd, Hg and Cu in the sample solution were determined by ICP-MS. Yttrium （for det＇n, of Cu and As）, rhodium （for Pb and Cd） and gold （for Hg） were selected as internal standards to decrease the matrix effects. In analyzing sample of vitamin C for its Hg-content, thiourea should be added as complexing agent to obtain normal recovery. Values of detection limit （3S/N） found were in the range of 0. 006-0. 064μg ·L-1 , and values of RSD＇s （n=ll） found were in the range of 2. 9%-5.9%. The proposed method was applied to the determination of trace amount of the 5 metal elements in 7 samples of nutrition fortifier, and values of recovery found by standard addition method were in the range of 92. 0%-105 %.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2013年第9期1058-1060,1064,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
