An indirect spectrophotometric method is developed for sulphate determination The method is based on the reduction of sulphate to sulphide by fusing the sulphate sample with metallic sodium in solid date. The hued contents were dissolved in water and fibered An aliquot of the filtrate was reacted with iron(III)phenanthroline solution to reduce irm(III) to iron(II) which formed a red colour complex with 1,10-phenanthroline. Absorbance of the final solution was measured at 515 am and plotted against sulphate concentration. The method proved itself sufficiently accurate and precise and equally good for soluble and insoluble sulphates as well as for sulphate content in solid and Liquid samples. The values of standard deviation and relative standard deviation calculated from absorbance values often solid samples of sodium sulphate were 0.006 and 0.82 % respectively. Effect of concerned parameters was checked and the developed method was applied for sulphate determination in a number of real samples.
J ANWAR ,WAHEED UZ ZAMAN ,F YASMIN ,
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