Atrazine Residues in Northern Ohio 1980

摘要

Atrazine residues in water were measured periodically from mid-May to mid-July 1980 for eight sites in the Sandusky River basin and for fourteen other northern Ohio streams draining into Lake Erie. Concentrations in the Sandusky River varied from 1.0 - 45.7 ug/1. Atrazine was present at levels greater than 20 ug/1 in 12.5% of the samples and greater than 5 ug/1 in 63.9% of the samples. Concentrations in the other streams ranged from 0.1 - 23.2 ug/1 with 2.3% of the samples greater than 10 ug/1, 27/9% greater than 5 ug/1 and 23.3% less than 1 ug/1. For several stations, atrazine levels were studied at more frequent intervals during a runoff event to observe variation with time and to attempt correlation with other parameters. Data for flow, suspended solids, and nitrates-nitrites are included for the Sandusky River samples and linear correlations between atrazine and each of these three parameters are discussed. (Author)