Analysis of herbicide residues by gas chromatography

Chemical confirmatory test for organophosphorus and carbamate insecticides and triazine and urea herbicides with reactive imino moieties

“…The difficulty of chromatographing urea herbicides and their low sensitivity on gc have been extensively reported (Cochrane and Purkayastha, 1973). Linuron decomposes rapidly above 170°and the use of short gc columns together with on-column injection is recommended to reduce thermal decomposition during gc analysis.…”

“…For confirmatory purposes, the former reactions are preferred since they yield specific derivatives. Examples of these reactions are the ones developed by Cochrane et al (Cochrane and Chau, 1971; Cochrane and Maybury, 1973; Cochrane and Purkayastha, 1973) for the cyclodienes and BHC. A general method for organophosphorus insecticides was reported by Shafik et al (1971), which consists of hydrolysis Chemistry and Biology Research Institute, Agriculture Canada, Ottawa, Ontario, K1A 0C6 Canada.…”

Gas chromatographic determination of 2,4-dichlorophenoxyacetic acid (2,4-D) by mass fragmentography with a deuterated internal standard

“…More reproducible results are obtained with the deuterated derivative of the compound being measured as the internal standard than with a conventional internal standard.Among chlorophenoxy acid herbicides 2,4-dichlorophenoxyacetic acid (2,4-D) is probably the most widely used and best known representative. A great number of papers, dealing with analysis, residues, and metabolism, have been published, an excellent review of which has appeared recently (Cochrane and Purkayastha, 1973). Due…”

“…Among chlorophenoxy acid herbicides 2,4-dichlorophenoxyacetic acid (2,4-D) is probably the most widely used and best known representative. A great number of papers, dealing with analysis, residues, and metabolism, have been published, an excellent review of which has appeared recently (Cochrane and Purkayastha, 1973). Due…”