A NEW HYDRAZONE DERIVATIVE AS A SENSITIVE ANALYTICAL REAGENT FOR THE DETERMINATION OF Co(II) IN FOOD, WATER AND SYNTHETIC SAMPLESAbstract
A novel (N’, N”E, N’, N”E)- N’, N” – (2, 2′ – (propane-1,3-diylbis(sulfanediyl))bis(1-(4-chlorophenyl) ethan – 2 – yl – 1 -ylidene))bis(2-hydroxybenzohydrazide)(CAPSH) is identified as a sensitive and selective analytical reagent for the determination of trace levels of Co(II) in environmental samples like in food, water, synthetic samples and medicinal plants by spectrophotometry. CAPSH reacts with cobalt(II) at pH 7.0, in aqueous DMF to form orange colored 1:1 (Co-CAPSH) complex shows maximum absorbance (λmax) at 380nm. The color reaction is immediate and the absorbance remains constant for about 24h. The molar absorptivity coefficient and Sandell’s sensitivity are found to be 7.9×104 L.mol-1 cm-1 and 0.048μg cm-2 of cobalt(II) respectively. The linear regression coefficient is 0.9998 and standard deviation is 0.0050. The system obeys Beer`s law in the range of 00.059-0.59μg mL-1of cobalt(II). Large number of cations, anions and complexing agents do not interfere in this method. This method is successfully applied for the determination of cobalt(II) in environmental samples like food, water (potable and polluted), synthetic samples and medicinal plants.
P. N. Kumar Reddy, G.T. Reddy, S. D. Kumar, A. V. R. Reddy, S. N. Parveen, and N. C. Gangi Reddy *
Analytical Chemistry Division, Bhabha Atomic Research Centre (BARC) Trombay, Mumbai, Maharashtra, India
27 June, 2015
31 August, 2015
06 November, 2015
01 January, 2016