Abstract
Procedures were evaluated for the reductive cleavage of 16 commercial azo dyes using sodium hydrosulfite and tin(II) chloride. Identification of the reduction product were mainly based upon mass spectra obtained by particle beam high-performance liquid chromatography/mass spectrometry (HPLC/MS). Standards of the formed reduction products, when available, were employed to confirm identities. The chemical reduction method resulted in nearlycomplete reduction of the azo bond to form aromatic amines . Overall, tin chloride was the more powerful reducing agent, yielding a greater number of products. The analysis of reduced industrial waste sludge extracts indicated the presence of identifiable aromatic amines which originated from the reduction of unknown dye components
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