Cloud point extraction spectrophotometric determination of nickel, copper, cobalt and chromium by 4- HBDA1,5DPHP as reagent in wastewater of Iraq

摘要

A simple, low cost and highly sensitive method based on cloud point extraction (CPE) used for separation/preconcentration of Nickel, Copper, Cobalt and Chromium has been described. After complexation with ligand 4- HBDA1, 5DPHP, the parameters which affecting of the separation phase and detection process, were optimized such as pH,4- HBDA1, 5DPHP, concentration of Triton X-100, incubation time and temperature. Calibration graph showed linear trend in rang of 5-50μgL~(-1),5-70μgL~(-1),5-80μgL~(-1)and 5-60μgL~(-1) for Ni(II), Cu(II), Co(II) and Cr(III) respectively, the recovery of analytes was in the range (98-99%, 97.5-99.8%, 96.5-99.7% and96-98%) detection limits was (2.805, 2.08, 0.456and 2.5μgL~(-1)) relative standard deviation (RSD) (1.6%,0.91%,1.8%,1.2%) respectively. The proposed method was applied successfully in wastewater samples.