Glyphosate (N-phosphonomethyl-glycine) herbicide samples were analysed qualitatively using gas chromatography-mass spectrometry (GC-MS) through derivatization with pentafluoropropionic anhydride plus trifluoroethanol. Besides the expected glyphosate perfluoroacetylated derivative, other compounds were observed and identified using this technique and MS alone with the direct inlet system (DIS). Three processes are probably involved in the formation of these products: 1) incomplete derivatization; 2) glyphosate degradation during the reaction; 3) traces of chemical impurities in the pesticide sample.
- gas chromatographic-mass spectrometric analysis
- pesticide derivatization
ASJC Scopus subject areas
- Environmental Chemistry
- Health, Toxicology and Mutagenesis
- Environmental Science(all)