Abstract
High performance liquid chromatography and an optimized colorimetric method were applied to determine the residual glyphosate in waters treated with double lamellar hydroxides such as Mg x Al y CO 3 .nH 2 O. The chromatographic determination was by means of derivatization with 9-fluorenylmethylchloroformiate and running time less than 2 minutes, faster than analogous methods in the literature. The colorimetric method was performed by optimizing the Ruhemann purple method. The chromatographic and colorimetric methods presented LOQ of 1.05 and 2.08 μg / mL and LOD of 0.31 and 0.84 μg / mL, respectively. The percentages of recovery of the methods are between 93 to 105% with RSD less than 2.35% for the chromatographic method and 6% for the colorimetric. Both methods depend on the temperature. The double hydroxide Mg 1 Al 1 CO 3 .nH 2 O has the highest percentage of charge density (5.54 nm 2 ) and the best performance in removing glyphosate from the aqueous medium.
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