浊点萃取-分光光度法测定水中痕量镍  

Determination of Trace Nickel in Water by UV-Visible Spectrophotometry after Cloud Point Extraction

作　　者：薛秀玲[1] 樊国峰[2] 陈虹丽[1] 蔡韵[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建泉州362021 [2]华侨大学环境保护设计研究所,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2008年第4期571-574,共4页Journal of Huaqiao University(Natural Science)

基　　金：福建省青年人才创新基金资助项目(2005J029);国务院侨办科研基金资助项目(05QJR05);华侨大学高层次引进人才科研启动项目(05BS304)

摘　　要：采用十二烷基磺酸钠（SDS）和Triton X-100的混合表面活性剂,以1-（2-吡啶偶氮）-2-萘酚（PAN）为络合剂,加入电解质NaCl溶液,通过紫外-可见分光光度法测定水中痕量镍.在室温下,考察影响浊点萃取、分离和富集金属离子镍的影响因素及适宜的反应条件.结果表明,在饱和NaCl的加入量为5.5 mL,体积分数为0.1%的PAN加入量为0.125 mL,SDS和Triton X-100的摩尔比在0.38～1.39时,所形成的体系对Ni2＋-PAN络合物具有较好的萃取效果.最佳条件下,方法的线性范围为0.1～1.0 mg·L^-1,相关系数R2=0.999 8,检测限为18.9μg·L^-1,镍的加标回收率达97%～99%,相对标准偏差为2%~4%.Cloud point extraction with Triton X-100 and sodium dodecyl sulfate （SDS） as mixed surfactants, 1-（2-pyridylazo）-2-naphthol （PAN） as chelating reagent and NaCl electrolyte for pre-concentrating trace levels of nickel, which as a prior step to its spectrophotometric determination has been studied in this paper. The parameters affecting the separation phase and detection process were investigated, and the optimal conditions at room temperature were followed： 5.5 mL of saturated NaCl, 0. 125 mL of 0. 1% PAN, the ratio of SDS and Triton X-100 were between 0.38 and 1.39. Under the optimum experimental conditions, calibration curve was linear in the range of 0. 1-1.0 mg · L^-1 with R^2 =0. 999 8, and the detection limits is 18.9μg · L^-1. The spiked recovery of nickel were 97%-99%. The relative standard deviation （RSD, n=4） was in the range of 2%-4%.

关 键 词：浊点萃取 镍 混合表面活性剂 分光光度法 

分 类 号：O647.2[理学—物理化学] S816.17[理学—化学]