The Detennination of Organochlorine Pesticides Residues in Chalus River Water by Multivariate Analysis

Numbers of chlorinated pesticides residues such as dde, kelthane, beta-bhc and ddt were determined by those waters from paddy fields and rivers that discharged to caspian sea. the multivariate analysis of variance 1.1anova was used to analyze the data obtained from this study. no significant difference was shown between the concentrations of all parameters during four seasons and all stations based on manova test. the total percentage of dde, kelthane, beta-bhc and ddt detected in stations were 63, 56, 50 and 69% over the year, respectively. the maximum concentrations of beta-bhc (fall), kelthane (fall), dde (spring) and ddt (summer) were 21.6, 15.4, 9.8 and 9.2(mu)g/i, respectively. the mimmum concentrations ofkelthane, beta-bhc, dde and ddt were 3, 3.1, 1.9 and 3(mu)g/i in stations 1 (summer), 2 (fall), 3 (summer) and 4 (summer), respectively. in agricultural periods, the most of chemicals compounds were found in spring and summer seasons. during four seasons, the most percentage of chemicals compounds such as ddt (summer), beta-bhc (summer-fall), kelthane (springsummer) and dde (spring) were 100, 75, 75 and 75%, respectively. according to the data, the amounts of beta-bhc respect to the lethal concentration of beta-bhc (lc50) for fishes (50 through 200(mu)g/i) duriug 96 hours were less and not remarkable.