Identification of Carbamates by Particle Beam/Mass Spectrometry

Competitive proton and hydride transfer reactions via ion‐neutral complexes: fragmentation of deprotonated benzyl N‐phenylcarbamates in mass spectrometry

“…In negative‐ion mode, compounds 1 to 18 were easily deprotonated by losing the proton attached to the nitrogen atom. Under collision activation condition, the heterolytic dissociation of the C(O)―O covalent bond occurred immediately, leading to the formation of ion a . For the generation of ion b , a proton transfer from the substituted aniline ring occurs, and a direct intramolecular proton transfer process has to be inferred.…”

“…Benzyl N ‐phenylcarbamates belong to a category of functional compounds that are extensively used in agriculture, pharmaceutical industry and laboratory . In the gas phase, protonated or deprotonated N ‐substituted carbamates normally break the C(O)―O bond . Benzyl N ‐phenylcarbamates are inclined to generate organic hydride donor benzyloxy anions in negative‐ion mode MS.…”

The role of column liquid chromatography-mass spectrometry in environmental trace-level analysis. Determination and identification of pesticides in water

“…This was convincingly shown for organophosphorus pesticides, carbamates and their TPs [42], triazines and phenylureas [43,44] and chlorinated phenoxy acids [45,46]. One case has been reported in which the LC-based introduction of the analytes, phenoxy acid herbicides, caused a reduction of the spectral quality due to thermal decomposition [46], while Honing et al [47] noted similar phenomena for carbamates.…”

Electrocatalytical of chlorophenoxycarboxylic acids at a protoporphyrin IX cobalt(III) chloride modified glassy carbon electrode

“…Standard methods for the analysis of these organic pollutants require typically derivatization. In a second step, gas chromatography (GC) [2], gas chromatography-mass spectrometry (GC-MS) [3] or high performance liquid chromatography (HPLC) [4,5] with UV-Vis [6], electrochemical [7] or MS [8][9][10] detection were employed for the quantitative analysis. Most of the techniques require the separation of individual compounds prior to detection and often elaborate extraction procedures [11][12][13].…”