Chen Yonghua, Xie Wenxiu. THE EXTRACTIVE ABSORPTION SPECTROSCOPICANALYSIS OF TRACE LEAD INPAINTING INK FOR FOODSTUFF[J]. Journal of University of Jinan(Social Science Edition), 1995,(3):80-84.
Chen Yonghua, Xie Wenxiu. THE EXTRACTIVE ABSORPTION SPECTROSCOPICANALYSIS OF TRACE LEAD INPAINTING INK FOR FOODSTUFF[J]. Journal of University of Jinan(Social Science Edition), 1995,(3):80-84.DOI:
可食印刷油墨[1]中微量铅的测定
摘要
本文对可食印刷红色油墨的消解过程
测定方法及分析条件进行了系统研究.实验用HNO
3
—HClO
4
混合酸消解此样品效果最好。在消化液中加入盐酸羟胺和柠檬酸铵后用NH
3
·H
2
O调PH值为8.5—9.0之间
用双硫腙—CHCl
3
溶液萃取铅
双硫腙在氯仿溶液中与Pb
2+
离子生成红色螯合物
用721型分光光度计测双硫腙—Pb的吸光度
计算Pb
2+
的含量。
Abstract
In this paper
we study the nitrating and analytic conditions of red ink. The best result will be obtained when HNO3:HCLO4=4:1 is present in the solution.Citric amide and KCN are added to the solution to prevent the precipitate of hydroxide and preclude the unnecessary ions before the value of PH is adjusted to 8. 5-9. 0 with NH3 ?H2O. then trace lead is extracted with CHCL3
and reacts with H2Dz to form red complex be-ing determined by 721 spectrum meter.
关键词
双硫腙萃取分离样品消解微量铅分析
Keywords
H2DzExtractive SeperationNitrationAnalysis of trace lead