琉基葡聚糖凝胶分离富集-二溴对甲偶氮羧微乳液分光光度法测定微量镍  

Microemulsion-spectrophotometric Determination of Micro Nickel with Dibromo-p-methyl Carboxyazo after Separation and Enrichment by Mercapto-dextrangel

作　　者：陈文宾[1] 王丽萍[1] 马卫兴[2] 许兴友[2] 徐国想[2] 

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221008 [2]淮海工学院化学工程系,江苏连云港222005

出　　处：《环境监测管理与技术》2008年第3期31-34,共4页The Administration and Technique of Environmental Monitoring

基　　金：教育部重点实验室开放基金资助项目(CPEUKF06-04);淮海工学院海洋生物技术重点建设实验室基金资助项目(2005HS001;2005HS010;2006HS020);淮海工学院自然科学基金资助项目(Z2006001)

摘　　要：研究了在溴代十六烷基吡啶(CPB)、正丁醇、正庚烷、水自制微乳溶液存在下,镍与二溴对甲偶氮羧(DBpM-CA)的显色反应,在pH值为9.07的Na2B4O7-HCl缓冲溶液中,镍与试剂形成淡红色配合物,最大吸收峰位于560 nm波长处,表观摩尔吸光系数ε为2.8×105L/(mol.cm)。优化了试验条件,考察了共存离子的影响,方法在0.002 mg/L^0.320 mg/L范围内符合比尔定律,检出限为0.000 6 mg/L,生活垃圾、水、土壤样品测定的RSD为2.1%~5.2%,加标回收率为96.6%~104%。The color reaction of the reagent Dibromo-p-methyl carboxyazo （DBpMCA） with nickel in the presence of micromulsion Cetyl Pyridine Bromide（CPB） ,n-C4H9OH,CTH14 ,H2O were studied. Results showed that the color reagent with nickel and DBpMCA microemulsiom formed a stable light red complex in the medium of Na2B4O7-HCl buffer at pH 9.07. The maximum absorption wavelength and apparent molar absorptivity were 560 nm and 2.8 × 10^5 L/（ mol · cm） respectively. The test parameters were optimized and influence of coexist ions was observed. Beer＇s Law was obeyed in the range of 0. 002 mg/L - 0. 320 mg/L for nickel. The detection limit was 0. 000 6 mg/L. The RSD and recovery were 2. 1% - 5.2% and 96.6% - 104% in water ,domestic waste and soil samples.

关 键 词：镍 琉基葡聚糖凝胶 二溴对甲偶氮羧 分光光度法 

分 类 号：O657.32[理学—分析化学]