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ABSTRACT
A simple, rapid and highly sensitive extractive spectrophotometric method is developed for the determination of zinc(II) at trace level using benzildithiosemicarbazone(BDTSC). Zinc(II) forms greenish yellow colored complex with benzildithiosemicarbazone(BDTSC) which can be extracted into chloroform under optimum conditions. The maximum absorption of the chloroform extract measured is 405 nm. The Beer's law is obeyed over the range 1.0–18.0 µg mL−1 of zinc(II) with a relative standard deviation 1.28. The molar absorptivity of the complex is calculated as 0.4194 × 104 dm3 mol−1 cm−1 and Sandell's sensitivity of the complex is 0.01560 µg cm−2. An excellent linearity with correlation coefficient value of 0.999 is obtained for Zn(II)–BDTSC complex. The method has been successfully employed for the determination of zinc(II) in biological and environmental samples. The reliability of the method was assured by analyzing the Certified Reference Materials such as, Tomato Leaves (NIST 1573), Citrus Leaves (NBS 1572) and Whole Milk Powder (NIST SRM 8435) and by the comparison of experimental values using atomic absorption spectroscopy.