Determination of aromatic amines originating from azo dyes by chemical reduction combined with liquid chromatography/mass spectrometry

Reductive or oxidative processes were frequently used to remove colour from wastewaters from the manufacture of synthetic dyes before discharge, but little was known about the resulting new compounds formed. Reductive cleavage was applied to 16 commercial azo dyes, using either sodium hydrosulphite...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 1993-08, Vol.27 (8), p.1665-1672
Main Authors: Voyksner, Robert D, Straub, Rolf, Keever, Jeffrey T, Freeman, Harold S, Hsu, Whei-Neen
Format: Article
Language:English
Subjects:
Analysis methods
Applied sciences
Chromatography
Dyes
Exact sciences and technology
Mass spectrometry
Pigments
Pollution
Scientific imaging
Wastes
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Reductive or oxidative processes were frequently used to remove colour from wastewaters from the manufacture of synthetic dyes before discharge, but little was known about the resulting new compounds formed. Reductive cleavage was applied to 16 commercial azo dyes, using either sodium hydrosulphite or stannous chloride, and identified the reduction products by high-performance liquid chromatography and mass spectrometry. The chemical structures of the dyes with their names, colour index, and molecular weight are included and the reaction products identified are tabulated. There was almost complete reduction of the azo bond to form aromatic amines. Tin chloride was the more powerful reducing agent, and produced the greater number of products. Results obtained from application of this procedure to reduced industrial waste sludge extracts are tabulated. There are 38 references.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00045a025