Analytical Applications of 2,6-Diacetylpyridine-bis-4-phenyl-3-thiosemicarbazone (2,6-DAPBPTSC): Determination of Cd(II) in Foods and Water Samples

To the determination of trace amount of Cd(II) present in food and water samples, a selective and extractive spectrophotometric method were developed with 2,6‐diacetylpyridine‐bis‐4‐phenyl‐3‐thiosemicarbazone as a complexing agent. The yellowish orange colored metal complex, Cd(II)‐2,6‐DAPBPTSC with 1:1 (M:L) composition was extracted in to cyclohexanol at pH 9.5 and was shows maximum absorbance at λmax 390 nm. This method obeys Beer's law in the range of 1.12‐11.25 ppm with 0.972 correlation coefficient of Cd(II)‐2,6‐DAPBPTSC complex, which is indicates linearity between the two variables. The molar absorptivity and sandell's sensitivity were found to be 6.088 × 104 L mol−1 cm−1 and 0.0018 μg cm−2, respectively. The instability constant calculated from Asmus' method (1.447 × 10−4)at room temperature. The precision and accuracy of the method were checked by relative standard deviation (n = 5), 0.929 and its detection limit, 0.0060 μg mL−1. The interfering effects of various cations and anions were also studied. The proposed method was successfully applied to the determination of Cd(II) in foods and water samples, and was evaluated its performance in terms of Student ‘t’ test and Variance ‘f’ test, which indicates the significance of present method. The inter comparison of the experimental values, using atomic absorption spectrometer (AAS), was also repoted. A new reagent, 2,6‐DAPBPTSC was well performed for selective and sensitive extractive spectrophometric determination of Cd(II) in food and water samples by developed experimental conditions. The molar absorptivity and sandell's sensitivity were found to be 6.088×104 L mol‐1cm‐1 and 0.0018 μgcm‐2, respectively. This method was more precise and accuracy with detection limit, 0.0060 μg mL‐1.