Development of novel simultaneous single step and multistep cloud point extraction method for silver, cadmium and nickel in water samples

A novel, simple and rapid single and multi-step cloud point extraction procedure was developed for the selective and simultaneous preconcentration of silver, cadmium and nickel in real samples prior to their determination by flame atomic absorption spectrometry. Dithizone was used as neutral hydrophobic complexing agent. Separation of understudy metals can be achieved by controlling the pH value of the extraction system. Evaluation of the two CPE methods was checked by paired t-test, which indicated a non-significant difference. It was successfully applied to the real water sample. Certified reference materials were used for the accuracy of the green extraction methods. The regression equation for the calibration curve was linear in the range of 10-150 mu g L-1 for Ag, 5-100 mu g L-1 for Cd, 10-200 mu g L-1 for Ni. Relative standard deviation (RSD%) values were found to be lower than 2.5% for all elements. Enhancement factor (EF) and limit of detection (LOD) values were found in the range of 41-58 and 0.27-1.12 mu g L-1, respectively. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.