Influence of the soil organic matter content on voltammetric determination of derivatised glyphosate in herbicide contaminated soils

Abstract

The method for monitoring of Glyphosate (GP) in soil samples containing different organic matter content based on differential pulse voltammetry at a hanging mercury drop electrode was developed to reach higher sample preparation efficiency, its repeatability and sufficient limits of detection. The soil samples with three different organic matter contents (evaluated as total organic carbon contents 30.7, 13.0 and 6.3 g kg–1) were tested. The decreasing content of organic matter resulted in a decreasing recoveries (86, 78 and 68%, respectively), with RSD around 10%. The GP derivatised to N-nitrosoglyphosate (NO-GP) can be determined using the adopted method with limits of detection around 2 ppm in the soil samples. This method might be further utilized for routine monitoring of the GP in soil samples during investigation of its effect on the soil biota.