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本文研究了APDC-MIBK萃取体系及硝酸水溶液分离反萃取食品添加剂磷酸中的有害元素镉与铅,同时试验了应用石墨平台技术测定的最佳条件,并探讨主要共存元素和无机酸对测定的影响,提出减少背景吸收和利用反萃液中残留的微量磷酸作基体改进剂,以提高灰化温度和消除基体干扰的有效方法。按本法测定镉与铅时,其特征含量分别为3.85×10~(-12)g/1%和5.47×10~(-11) g/1%;变异系数为4.83%和3.94%(n=11):回收率在wt-92%至Wt-103%之间。
In this paper, we studied the extraction of cadmium and lead from APDC-MIBK extraction system and nitric acid solution and the removal of cadmium and lead from the phosphoric acid solution. Simultaneously, the optimum conditions for determination by graphite platform technology were studied. The effects of major coexisting elements and inorganic acids , Proposed to reduce the background absorption and the use of residual phosphoric acid in stripping solution as a matrix modifier to improve the ashing temperature and eliminate matrix interference effective method. The determination of cadmium and lead by this method, the characteristic content were 3.85 × 10 ~ (-12) g / 1% and 5.47 × 10 ~ (-11) g / 1%; coefficient of variation of 4.83% and 3.94% (n = 11): The recovery is between wt-92% and Wt-103%.