2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺浊点萃取-石墨炉原子吸收光谱法测定水中痕量Cu(Ⅱ)  

Determination of Trace Cu(Ⅱ)in Water Using2-(5-Bromo-2-pyridylazo)-5-dimethylaminoaniline as a Complexing Agent by Cloud Point Extraction-Graphite Furnace Atomic Absorption Spectrometry

作　　者：杨晓慧[1] 杨龙虎[2] 霍燕燕[1] 马盛杰 翟云会[1] 韩权[1,2] 

机构地区：[1]西安文理学院化学与化学工程学院,陕西西安710065 [2]延安大学化学与化工学院,陕西延安716000

出　　处：《分析科学学报》2015年第1期107-110,共4页Journal of Analytical Science

基　　金：西安市科技计划(No.CXY1352WL04);2013年西安市水务局横向项目

摘　　要：以2-（5-溴-2-吡啶偶氮）-5-二甲氨基苯胺（5-Br-PADMA）为螯合剂,Triton X-114为萃取剂,建立了浊点萃取-石墨炉原子吸收光谱法测定超痕量Cu（Ⅱ）的新方法。研究了溶液pH、螯合剂和表面活性剂浓度、平衡温度和时间等因素对浊点萃取的影响。优化条件为：pH=5.0 HAc-NaAc缓冲溶液,0.35 mL 5.0×10-4 mol/L 5-BrPADMA,1.0mL 1.0%Triton X-114,60℃保温15min。方法的线性范围为0.05~4.0ng/mL,检出限为0.017ng/mL,相对标准偏差为3.1%（n=10）,富集因子为48。方法用于水样中痕量Cu（Ⅱ）的测定,加标回收率在97.0%~102.0%之间。A new method based on cloud point extraction（CPE）and graphite furnace atomic absorption spectrometry（GFAAS）was established for the determination of ultra-trace Cu（Ⅱ）in water samples.2-（5-bromo-2-pyridylazo）-5-dimethylaminoaniline（5-Br-PADMA）was used as the chelating agent and Triton X-114 as the extractant.The main parameters affecting extraction,such as pH,concentration of chelating agent and surfactant,extraction temperature and time,were investigated in detail.The optimized CPE conditions were as follows：pH=5.0 HAc-NaAc buffer solution,0.35 mL 5.0×10-4mol/L 5-Br-PADMA,1.0 mL 1.0% Triton X-114,heat-assisted at 60 ℃ for 15 min.Under optimized conditions,the analytical curve was linear in the range of 0.05-4.0ng/mL and the detection limit was0.017ng/mL for Cu（Ⅱ）,and relative standard deviation was 3.1%（c=0.1ng/mL,n=10）,the enrichment factor was 48.The method has been applied to the determination of trace copper in water samples and the recovery were 97.0%-102.0%for the spiked tap water sample.

关 键 词：2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺 Cu(Ⅱ) TRITON X-114 浊点萃取 石墨炉原子吸收光谱法 

分 类 号：O657.31[理学—分析化学]