Spectrophotometric determination of microcadmium in water after ionic liquid extraction
LI Shan 1, CHEN Zhen 1, WANG Qian 2, WANG Yinghua* 1
1 College of Chemistry, Jilin University, Changchun 130012, China; 2 College of Materials Science and Engineering, Jilin University, Changchun 130012, China
Abstract： A new extraction spectrophotometry for the determination of microcadmium was proposed. In Na2B4O7NaOH buffer medium at pH 10.8, the CdCadion complex formed by 1(4 nitrobenzophenone)3(4phenylazophenyl) triazene (Cadion) and Cd2+ could be extracted by little ionic liquid (1butyl3methylimidazole hexafluorophosphate, ［Bmim］［PF6］). After centrifugal separation, the content of cadmium in ionic liquid phase was directly determined by spectrophotometry at maximum absorption wavelength (517 nm). The linear range of this method was 1.0-62.5 ng/mL, the detection limit was 0.22 ng/mL, apparent molar absorptivity was 6.9×105 L·mol-1·cm-1, the enhancement factor was 29.5, and the relative standard deviation (RSD, 50 ng/mL, n=6) was 2.1 %. The proposed method was directly applied to the determination of microcadmium in water sample with recoveries of 96.7 %-108.5 %.
李姗，陈珍，王千，王英华*. 离子液体萃取光度法测定水中微量镉[J]. 冶金分析, 2012, 32(02): 28-31.
LI Shan, CHEN Zhen, WANG Qian, WANG Yinghua*. Spectrophotometric determination of microcadmium in water after ionic liquid extraction. , 2012, 32(02): 28-31.
