浊点萃取分光光度法测定黄芪水煎液中的痕量铜  

Determination of Trace Copper in Radix Astragali Water Decoction by Cloud Point Extraction Spectrophotometry

作　　者：要如磊 王尚芝 YAO Rulei;WANG Shangzhi(Yangquan Coal Group Taiyuan Chemical New Material Co.,LTD,Taiyuan 030040,Chin)

机构地区：[1]阳煤集团太原化工新材料有限公司,山西太原030040

出　　处：《武汉工程大学学报》2018年第4期391-394,共4页Journal of Wuhan Institute of Technology

摘　　要：为了建立一种测定痕量铜的新方法,选用8-羟基喹啉为铜的络合剂,Triton X-114为萃取剂,并将Cu(II)与8-羟基喹啉形成的络合物萃取到表面活性剂相,采用分光光度法进行测定。通过系列实验得出最优实验条件:铜Cu(II)与8-羟基喹啉络合物测定波长412 nm,缓冲溶液p H=7.0、用量为3.50 m L,8-羟基喹啉络合剂用量为0.70 m L,Triton X-114萃取剂用量为0.60 m L,选择平衡温度为45℃、时间为20 min。在最优实验条件下,检出限为0.014 mg/L,相对偏差为4.01%。该法用于黄芪水煎液中痕量铜的测定,回收率为95.5%~98.3%,结果令人满意。To establish a new method for determination of trace copper,this article uses 8-hydroxyquinoline as a complexing agent and Triton X-114 as a extraction agent.The 8-quinolinol copper was extracted to the phase of nonionic surfactant and determined by spectrophotometry.The optimal experimental conditions were shown as：the maximum absorption wavelength was 412 nm,the dosage of buffer solution was 3.50 m L with p H=7.0,the dosages of 8-hydroxyquinoline and Triton X-114 were 0.70 m L and 0.60 m L respectively,the equilibrium temperature was 45℃,and equilibrium time was 20 min.Under the optimal conditions,the detection limit was0.014 mg/L,and the relative standard deviation was 4.01%.The proposed method had been used to determine trace copper in Radix Astragali water decoction with the satisfactory recovery rates of 95.5%-98.3%。

关 键 词：铜 黄芪 浊点萃取 分光光度法 

分 类 号：O652.1[理学—分析化学]