title: Selecting analytical target pesticides in monitoring: Sensitivity analysis and scoring.
abstract: Measuring river water concentrations of all pesticides applied in a catchment area is a daunting task. This study aims to develop new score tables for selecting analytical target pesticides. Sensitivity analyses were conducted using a diffuse pollution hydrologic model to quantitatively evaluate the influence of pesticide properties (e.g., log K(OC), degradability [half-life]) on concentrations of rice-farming pesticides in river water. Using the results of the analyses, score tables were systematically designed for the pesticide properties such that the sum of the scores for a particular pesticide, designated as the contamination index, was proportional to the expected/predicted concentration of that pesticide in river water. The contamination indexes for pesticides applied in three river basins were calculated and compared with the corresponding observed pesticide concentrations. Correlations between contamination indexes and observed concentrations were fairly good. Pesticides were ranked according to the quotients obtained by dividing the pesticide concentrations predicted from the contamination indexes by the corresponding drinking-water quality guideline values, and pesticide candidates to be monitored were successfully selected on the basis of a threshold quotient.
authors.affiliation: Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Tani
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Matsui
authors.forename: Kensuke
authors.initials: K
authors.lastname: Iwao
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Kamata
authors.forename: Taku
authors.initials: T
authors.lastname: Matsushita
mesh_terms: D000327:Adsorption; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods*; D005659:Fungicides, Industrial / Q000032:analysis; D006540:Herbicides / Q000032:analysis; D007564:Japan; D010575:Pesticides / Q000032:analysis*; D045483:Rivers / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014876:Water Pollution / Q000032:analysis
chemical_list: D005659:Fungicides, Industrial; D006540:Herbicides; D010575:Pesticides; D012987:Soil; D014874:Water Pollutants, Chemical