Differential pulse polarographic determination of benfluralin and trifluralin in formulations soils and grains

The electrochemical behavior of the herbicides benfluralin and trifluralin was studied using differential pulse polarography in universal buffers of p H range 2.0 to 12.0. The cathodic peak observed for the herbicides are attr ibuted to the reduction of nitro groups and showed to be pH dependent. Diff erential pulse polarography at dropping mercury electrode was used to estab lish an electroanalytical procedure far the determination of the herbicides benfluralin and trifluralin in formulations, soils and grains. Quantitativ e measurements were successful in the concentration range of 1.25X10(-5) to 2.85X10(-9) M, the lower concentration representing the detection limit by differential pulse polarography.