Comparison of methods for determination of glyphosate at sub-ppb levels by UHPLC-MS/MS.

REPETTI, MARÍA ROSA; DEMONTE, LUISINA; MICHLIG, NICOLÁS; GARCÍA, SILVIA; DE JESÚS, JUAN JOSÉ; BELDOMÉNICO, HORACIO

Bogotá

Workshop; 4th Latin American Pesticide Residue Workshop; 2013

Glyphosate as a generic denomination for the non-selective, post emergence herbicide products with the a.i. N-(phosphonomethyl)-glycine, is by far the agrochemical product more extensively used in Argentina (210 million kg-L in 2011), increasing continuously during last decade to sustain the explosive growing of Argentinean agricultural production (102.8 million tons of grains in agricultural cycle 2010/2011). The need of specific studies and controls in food and environment, with aid of up-to-date technologies, is one of the outstanding proposals. In this scenario the contribution of analytical chemistry of pesticides is relevant and oriented several new activities of our laboratory supported in specific research projects and activities. The development of a chromatographic-mass spectrometric (UHPLC MSMS) method for the determination of glyphosate, AMPA and glufosinate in water and sediments, with studies of alternatives in FMOC derivatization and preconcentration step, and its application to selected regional samples are described.