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Determination of malachite green and its leuco form in water

Journal of AOAC International

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Abstract

Liquid chromatographic (lc) analysis can detect malachite green residues in water at less than 10 mu-g/l. Water samples were concentrated on disposable diol columns, eluted with 0.05m P-toluene-sulfonic acid in methanol, and determined by reversed-phase lc. When combined with a lead oxide postcolumn reactor, the lc method can simultaneously determine both leuco and chromatic forms of malachite green. Recoveries averaged 95.4% For the chromatic form and 57.3% For the leuco form of malachite green oxalate and leuco malachite green in spiked pond water samples. Recoveries of the carbinol form of malachite green (an equilibrium product of the dye in water) from spiked tap water samples averaged 98.6%. Recoveries of leuco malachite green were low and ph-dependent.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Determination of malachite green and its leuco form in water
Series title:
Journal of AOAC International
Volume
75
Issue:
4
Year Published:
1992
Language:
English
Publisher:
U.S. Fish and Wildlife Service
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 646-649
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
646
Last page:
649
Number of Pages:
4