吡咯烷二硫代氨基甲酸铵-Ni(Ⅱ)快速共沉淀分离富集和原子吸收光谱法测定痕量铜、铅和镉  

Further Improvement of Flame Atomic Absorption Spectrometric Determination for Cu,Pb and Cd After Preconcentration Using a Rapid Coprecipitation Technique

作　　者：苏耀东[1] 黄燕[1] 郝冰冰[1] 甘礼华[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《分析科学学报》2007年第2期173-176,共4页Journal of Analytical Science

基　　金：国家自然科学基金(No.20473057)

摘　　要：研究了用吡咯烷二硫代氨基甲酸铵（APDC）为沉淀剂，以Ni（Ⅱ）为载体离子的共沉淀体系快速共沉淀分离富集铜、铅和镉，并用火焰原子吸收光谱（FAAS）测定的方法。通常情况下，内标元素和载体离子选择不同的元素，本文尝试将Ni既作为载体又作为内标元素。实验证明，该体系在pH=3．0的条件下，能够定量共沉淀试样中的铜、铅和镉。当试液为100mL时，铜、铅、镉的检出限分别为9．7×10^-3、3．3×10^-2，1．01×10^-3μg·mL，加标回收率为95．8％～101．8％，取得了较为满意的结果。本法只需快速收集部分沉淀，与传统的共沉淀方法比较，具有快速、简便、重现性好的优点。A method was proposed for the determination of trace copper, lead and cadmium with flame atomic absorption spectrometry after preconcentration of copper, lead and cadmium by rapid coprecipitation technique with APDC-Ni（Ⅱ） using nickel as internal standard at pH 3. The standard addition recovery of elements is between 95.8～101.8%. The detection limits are 9.7×10^-3 μg·mL^-1 for copper, 3.3×10^-2 μg·mL^-1 for lead and 1.01×10^-3μg·mL^-1 for cadmium, respectively when the sample volume is 100 mL. The effect of matrix can be overcome by the method and the results are satisfying. The method proposed here is rapid and has good reproducibility.

关 键 词：镍 共沉淀 内标法 火焰原子吸收光谱 

分 类 号：O657.31[理学—分析化学]