Cloud point extraction procedure for preconcentration of Co2+, Ni2+ and Cu2+ from water and biological samples using a thiosemicarbazone derivative as a complexing agent.

Abstract

An accurate and simple preconcentration procedure was presented for cloud point extraction of Co 2+ , Ni 2+ and Cu 2+ from water, blood and urine samples. The procedure based on complexation of the metal ions with (E)-2-(2,4-dihydroxybenzylidene)-Nphenylhydrazine-1-carbothioamide (DHBPHC) and subsequent extraction into a surfactant-rich phase of Triton X-114. The optimized procedure (50 mL solution; pH 6; 1 × 10 -4 mol L -1 of DHBPHC; 0.08% (v/v) Triton X-114) exhibits linear range up to 500 µg L -1 and limit of detection of 0.34, 0.94 and 0.83 µg L -1 for Co 2+ , Ni 2+ and Cu 2+ , respectively. Most potentially interferants did not impact the extraction process. The procedure was applied for preconcentration and determination of Co 2+ , Ni 2+ and Cu 2+ in water, blood and urine by flame atomic absorption spectrometry.

Efficiency enhancement of the spectrophotometric determination of Zinc in water, food and pharmaceutical preparations samples using Cloud Point Extraction

“…Additionally, as compared to the traditional liquidliquid extraction technique, the CPE methodology has gained popularity because to its high enrichment factor, high recovery, quick phase separation, low cost, minimal use of organic solvents, and ability of be combined with other detection methods. To quantify the concentration of metal elements in various samples, CPE has been employed in conjunction with a range of modern analytical techniques, including FAAS and spectrophotometry [27][28][29][30][31][32][33].…”