A New Simple and Rapid Spectrophotometry for Determination of Sulfite and Bisulfite

A spectrophotometric method for the determination of SO32-and HSO3-,based on rapidly decoloring blue of malachite green by SO32-or HSO3-in the buffer medium of pH 4~6.The maximum absorption wave-length is at 620 nm.The calibration graph for SO32-and HSO3-were linear from 4.00 10-4~2.00×10-3g/L SO32-g/L with molar absorptivity ofe620=5.76×104and 4.00×10-4~2.00×10-3g/L HSO3-withe620= 4.52×104,respectively.The method can be used to determination of sulfite in synthetic solution containing sulfite,thiosulfate and sulfate.