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Paper Details

Spectrophotometeric Determination of Zinc (II) in Food-Stuffs and Biological Samples with Tris-[2, 4, 6-(2-Hydroxy-4-Sulpho-1-Naphthylazo)] -S-Triazine, Trisodium Salt

Sapana Garg1, Devender Singh1, Sonia Verma2 and Pratap Singh Kadyan1*

Journal Title:Journal of Chemical, Biological and physical sciences

Tris-[2,4,6-(2-hydroxy-4-sulpho-1-naphthylazo)]-s-triazine, tri sodium salt (THT) is proposed as a sensitive and selective reagent for the spectrophotometric determination of zinc(II). An addition of dilute solution of zinc ions to the aqueous solution of THT resulted to form water soluble dark brown complex in the pH range 5.5-7.4, absorbing maximum at 510 nm. The reaction between THT and zinc(II) is instantaneous and the absorbance remains stable for over 24 h. Beers law is valid over concentration range 0.0-1.45 ppm with molar absorptivity and Sandells sensitivity of 4.75X104 l. mol-1 cm-1 and 0.00145 ?g cm-2, respectively. The molar composition of the complex is 1:1 (M:L) as determined by Jobs method of continuous variation. The tolerance limits for interfering ions have been investigated. All variable have been studied in order to optimize the reaction conditions. The efficiency of the proposed method is shown by the successful determination of traces of zinc(II) in food stuffs and biological samples.