Enrichment of some heavy metals with cloud point extraction via 5,7-diiodo-8-hydroxyquinoline ligand and detection by ultrasonic nebulizer-ICP-OES using internal standard method

Abstract

In this study, a method was developed in which the heavy metal ions of Cu +2 , Cd +2 , Co +2 , Ni +2 , Pb +2 , Zn +2 in water samples are enriched by using cloud point extraction and detection using ultrasonic nebulization with inductively coupled plasma optical emission spectrometry (USN-ICP-OES). The metal ions, complexed with the Triton X- 114 surfactant, were imprisoned in the mycelium after phase separation via the centrifuge. The surfactant phase was diluted with 2 M HNO 3 and measured by USN-ICP-OES. In order to reduce noise and errors, indium was used as the internal standard. The pH, surfactant concentration, ligand concentration, equilibration time, temperature, and foreign ion effects were investigated. The limit of detection of Cu +2 , Zn +2 , Ni +2 , Cd +2 , Co +2 , Pb +2 usingt pH=7, 0.1 mmol L-1 5,7- diiodo-8-hydroxyquinoline, and %0.06 (w/v) Triton X-114 were found to be 0.076, 0.30, 0,081, 0.022, 0.033, and 0.049 μg L-1, respectively. The RSD% was between 2.08% and 6.28% (n=10). The developed method is in accordance within green chemistry and was successfully applied to certified reference materials and real water samples.