多重标准曲线技术在原子吸收光谱法测定陶瓷铅、镉溶出量中的应用  

The Application of Multiple Standard Curve Technology in Lead and Cadmium Dissolution Test of Domestic Ceramics by Atomic Absorption Spectrometry

作　　者：李文杰[1] 董一军[1] 王海涛[1] LI Wenjie DONG Yijun WANG Haitao(Ceramic Testing Lab of Tangshan Entry-exit Inspection ＆ Quarantine Bureau, Tangshan 063000, Hebei, Chin)

机构地区：[1]唐山出入境检验检疫局国家陶瓷检测重点实验室,河北唐山063000

出　　处：《中国陶瓷工业》2016年第5期43-50,共8页China Ceramic Industry

基　　金：2015年度国家质检总局科技计划项目资助(2015IK107)

摘　　要：简述了火焰原子吸收光谱法测定日用陶瓷铅、镉溶出量及多重标准曲线法的基本原理,根据12组标准样液不同的铅、镉浓度范围,从一系列线性拟合回归方程中寻找|A_0-?_0|最小者作为多重标准曲线法测定条件。比较其与国标法及常规法三种不同标准工作曲线条件下,同一样液中重金属浓度测定结果的差异程度并分析原因。推导出当铅、镉浓度低于40.0 mg/L和4.00 mg/L时,其测定结果准确性较高,但对中、高浓度样液的测试准确度偏低。常规方法对浓度介于0.0 mg/L-1.0 mg/L和0.00 mg/L-0.10 mg/L之间样液的测试误差较大,对中、高浓度样液的测试误差较小。而多重标准曲线法对所有浓度样液的铅、镉浓度检测结果不确定度均最小。This paper summarized the principles of lead and cadmium dissolution measurement of domestic ceramics by atomic absorption spectrometry and the multiple standard curve method. The minimized ｜A0-A0｜ was obtained from a series of linear fitting regression equations as the condition of multiple standard curve method for different lead and cadmium concentration ranges of 12 groups of standard sample liquids. The difference between the heavy metal concentration testing results of the same sample liquid obtained from the working curves by the national standard method, the conventional method and the multiple standard method was studied and the cause was analyzed. It is deduced that the accuracy of testing results is higher by national standard method when the concentrations of lead and cadmium are respectively lower than 40.0 mg/L and 4.00 mg/L, but the conclusion is opposite when their concentrations are beyond this scope; the testing error is bigger when the concentrations of lead and cadmium of the sample liquid are respectively between 0.0 mg/L - 1.0 mg/L and 0.00 mg/L -0.10 mg/L by conventional method, but the conclusion is opposite for the medium and high concentration of sample liquid; The degree of uncertainty by multiple standard curve method is the smallest for the entire concentration range of sample liquid.

关 键 词：多重标准曲线法 原子吸收光谱法 测定 日用陶瓷 铅、镉溶出量 

分 类 号：TQ174.73[化学工程—陶瓷工业]