• Mehyeddine Hedjazi Oles Honchar Dnipro National University, Algeria
  • Andriy B. Vishnikin Oles Honchar Dnipro National University, Ukraine
  • Svetlana N. Khudyakova Oles Honchar Dnipro National University,




cadmium determination, ion associate, Astra Phloxine, spectrophotometry, Wood`s alloy, mine water


A very simple, rapid, highly sensitive and selective non-extractive spectrophotometric method for the determination of trace amounts of cadmium(II) has been proposed. It is based on the formation of ion association complex (IA) between iodide complex of cadmium Cd(II) [CdJ42-] and polymethine dye Astra Phloxine FF. The color of the solution changes from red to red-purple. The color of the IA develops completely at temperature less than 18 oC after 5-10 minutes after mixing of reagents and remains constant over several hours. Opitmal concentrations of HCl, AP and KJ are 0.07–0.13 M, 1.2×10-5 M and 6×10-3 M, respectively. The molar absorptivity of the IA is 6.5×104 mol-1 L cm-1. The calibration graph is linear between 1×10-7 and 3×10-6 mol L-1 of cadmium (II). The limit of detection is 5×10-8 mol L-1 (l = 5 cm, 0.006 mg L-1). A large excess of over 50 cations, anions and some common complexing agents do not interfere with the determination. The method was successfully applied in the determination of cadmium in Wood`s alloy and mine water.

Author Biographies

Mehyeddine Hedjazi, Oles Honchar Dnipro National University

PhD student of Analytical Chemistry Department of DNU

Andriy B. Vishnikin, Oles Honchar Dnipro National University

Head of Analytical Chemistry Department h-index (SCOPUS) = 10

Svetlana N. Khudyakova, Oles Honchar Dnipro National University

Docent of Analytical Chemistry Department of DNU


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