浊点萃取-火焰原子吸收光谱法测定矿渣中痕量金  

Determination of Gold in Mineral Waste Residue Samples by Flame Atomic Absorption Spectrometry after Cloud Point Extraction with Dithizone

作　　者：杨柳[1] 周方钦[1] 黄荣辉[1] 刘正华[1] 罗友云[1] 

机构地区：[1]湘潭大学化学学院,湖南湘潭411105

出　　处：《分析科学学报》2008年第2期185-188,共4页Journal of Analytical Science

摘　　要：研究了以双硫腙为络合剂，以非离子型表面活性剂Triton X-100为萃取剂的浊点萃取-火焰原子吸收光谱法（CPE—FAAs）测定痕量金（Ⅲ）的新方法。详细考察了溶液的pH值、络合剂和表面活性剂浓度、平衡温度和时间等条件对浊点萃取效果的影响。该方法的线性范围为0．05～0．8μg／mL，检出限为7．9ng／mL，相对标准偏差为4．12％（n=11），回收率在98．0％～102．0％之间，用于矿渣中金的测定，结果满意。A new method for the determination of trace gold by flame atomic absorption spectrometry after cloud point extraction was proposed. The effects of experimental conditions such as pH, concentration of chelating agent and surfactant, equilibration temperature and time on cloud point extraction were discussed. Under the optimum conditions, the detection limit was 7.9 ng/mL with the relative standard deviation of 4.12% （n= 11）. The recoveries of Au^3＋ ranged from 98.0% to 102.0%. The proposed method has been applied to the determination of gold in mineral waste residue samples with satisfactory results.

关 键 词：浊点萃取 火焰原子吸收光谱法 TRITON X-100 金 双硫腙 

分 类 号：O657.31[理学—分析化学]