An indirect spectrophotometric method for the separate determination of sulphide and sulphite in aqueous solution in described. Iron (III) in slightly acidic medium is reduced to iron (II), to form an intense purple colour of the bis 2,3,5,6 tetrakis (2-pyridyl) pyrazine iron (II) complex. The colour formation of the complex obeys the Beer’s law over the range of 6 x 10-6 to 4.8 x 10-5 sulphide and 2 x 10-5 to 1.6 x 10-4 sulphite ion concentrations. The effect of diverse ions on the determination of sulphide is also evaluated.
R B BOZDAR ,M Y KHUHAWAR ,F C NACHNANI ,
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