A method has been developed for cadmium determination based on the formation of an ion associate between Cd(II) and 2-[2-(5-dimetylamino-2-tienyl)-vinyl]-1,3,3-trimetyl-3H-indolium bromide (DTVTI) reagent, with the aid of iodide as ligand, which is extractable by a mixture of toluene and tributylphosphate. The optimum experimental conditions were investigated and found to be as follows: pH 1.4, concentration of KI 0.02molL-1, concentration of DTVTI 1×10-4molL-1, toluene as the extraction solvent and tributylphosphate as the donor-active solvent. The reaction mechanism and the role of the solvents were also discussed. The calibration plot was linear in the range of 0.11-2.25mgL-1 of cadmium. The developed procedure was applied for cadmium determination in aqueous samples.
- Dispersive liquid-liquid microextraction (DLLME)
- Green analytical chemistry
- Low-density solvent
ASJC Scopus subject areas
- Analytical Chemistry