Abstract
The thioindigo test for the detection of monohalogenoacetic acids and/or derivatives thereof has been adopted for spectrophotometric estimation of residues in wines and other substrates. However, this method has been found to lack specificity because other compounds occurring as residual contaminants, such as those of phenoxy acetic acid herbicides, are able to form the thioindigo, presumably through a reaction in which the phenoxy ether bond is split and the liberated acetic moiety is able to couple with the SH group of thiosalicylic acid by a substitution mechanism.
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Baluja, G., Franco, J.M. & Murado, M.A. Interference of phenoxyacetic acid derivatives in the estimation of monochloroacetic acid by the thioindigo method. Arch. Environ. Contam. Toxicol. 1, 375–380 (1973). https://doi.org/10.1007/BF01985437
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DOI: https://doi.org/10.1007/BF01985437