DISTRIBUTION OF ANTIMICROBIAL SUBSTANCES IN RIVERS WITH AN AGRICULTURAL CATCHMENT - A CASE STUDY OF NIIDAGAWA RIVER SYSTEM IN IWATE PREFECTURE -

Abstract

 Antimicrobial substances in river water and in-stream organic matter (suspended fine particulate organic matter (SFPOM), attached algae and bentic fine particulate organic matter (BFPOM)) were analysed in rivers whose catchment area is an agricultural and livestock farming region, and the behaviour and distribution of antimicrobial substances between rivers was studied. The results of the measurement of 14 antimicrobial substances common to water and each organic matter in the river showed that 10, 3, 7 and 5 antimicrobial substances were detected in river water, SFPOM, attached algae and BFPOM, respectively. In addition, a comprehensive analysis of 74 antimicrobial substances in organic matter in rivers showed that 11, 38 and 24 antimicrobial substances were detected from SFPOM, attached algae and BFPOM, respectively, although at trace concentrations, suggesting that antimicrobial substances in rivers show different distribution and behaviour depending on the type of organic matter, survey period and sampling point.