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Metal substitution method for the spectrophotometric determination of zinc(II) in real samples

Mohammad NasirUddin, Mohammad AmzadHossain

Aspectrophotometric procedure for the determination of zinc(II) by its quantitative displacementwith copper(II) fromdiethyldithiocarbamate complex, Cu(DDTC)2 is described. Subsequently, Cu(II) complexwas extractedwith CHCl3/CCl4 and the absorbance was measured at 435 nm. The molar absorptivity (å) and SandallÂ’s sensitivity at this wavelength are 2.86 × 105mole-1 Lcm-1 and 3.076 ng cm-2, respectively.Reproducibilitywithin 4%detection limit was 0.029 ìg mL-1 and linear calibration range was 0.2-14 ìg mL-1 with the regression coefficient (r2) 0.998 for zinc determination. In the presence of a suitablemasking agent (ascorbic acid and sodiumthiosulfate) verygoodselectivitywas achieved.Themethod was extended to the determination of zinc in a number of environmentalwater and soil samples, biological, pharmaceutical, fertilizer and food samples.