A SCREENING SURVEY FOR CHLOROTHALONIL RESIDUES IN WATERS PROXIMAL TO AREAS OF INTENSIVE AGRICULTURE

Publisher Website
Google Scholar
Abstract
Waters in four components of the hydrologic cycle were sampled from study sites in New Brunswick, Nova Scotia and Prince Edward Island, and analyzed for chlorothalonil (TCIN) residues. Four out of 66 tile drainage samples, collected from replicated plots, indicated TCIN residues at detection limit concentrations of 0.005 to 0.008 μg∙L−1 in the spring of 1990, 7 months after application. No TCIN residues were reported in duplicate samples from 19 private wells sampled during the fall even though these wells were influenced by agriculture as measured by Nitrate-N. TCIN was detected at 2 of 11 surface water stations at concentrations ranging from 0.006 to 0.011 μg∙L−1. Concentrations in precipitation from two monitoring sites ranged from not detected to 0.034 μg∙L−1 with maxima occurring in April and August. Agricultural land use as well as rate and timing of chlorothalonil application was best quantified for the crop rootzone study sites and was least quantified for the precipitation collection sites.

This publication has 14 references indexed in Scilit: