title: Occurrence and Distribution of Carbamate Pesticides and Metalaxyl in Southern Ontario Surface Waters 2007-2010.
abstract: Surface water sampling in 2007-2010 measured the occurrence of carbamates and metalaxyl during base flow conditions and wet weather events in southern Ontario surface waters. Carbaryl, metalaxyl and pirimicarb were the most frequently detected compounds. In 2008 these three compounds were detected in over 50 % of the samples. Overall mean concentrations of carbaryl and metalaxyl over the course of the study (2007-2010) were 15 and 18 ng/L, respectively. Elevated concentrations of carbaryl (~100 to ~950 ng/L) appeared associated with wet weather (high flow) events, while highest concentrations of metalaxyl (~20-1330 ng/L) were correlated with base flow conditions. We attributed these observations as the result of runoff of carbaryl from the watershed during rain events, while metalaxyl contamination may have resulted primarily from spray drift.
authors.affiliation: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, ON, L7S 1A1, Canada. john.struger@canada.ca.
authors.forename: John
authors.initials: J
authors.lastname: Struger
authors.affiliation: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, ON, L7S 1A1, Canada.
authors.forename: Josey
authors.initials: J
authors.lastname: Grabuski
authors.affiliation: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, ON, L7S 1A1, Canada.
authors.forename: Steve
authors.initials: S
authors.lastname: Cagampan
authors.affiliation: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, ON, L7S 1A1, Canada.
authors.forename: Ed
authors.initials: E
authors.lastname: Sverko
authors.affiliation: Water Science and Technology Directorate, Environment Canada, 867 Lakeshore Road, Burlington, ON, L7S 1A1, Canada.
authors.forename: Chris
authors.initials: C
authors.lastname: Marvin
mesh_terms: D000409:Alanine / Q000031:analogs & derivatives* / Q000032:analysis; D002219:Carbamates / Q000032:analysis*; D012721:Carbaryl / Q000032:analysis*; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis / Q000737:chemistry*; D009864:Ontario; D010575:Pesticides / Q000032:analysis*; D011743:Pyrimidines / Q000032:analysis*; D011891:Rain; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002219:Carbamates; D010575:Pesticides; D011743:Pyrimidines; D014874:Water Pollutants, Chemical; C028175:metalaxyl; C011994:pirimicarb; D000409:Alanine; D012721:Carbaryl
keywords: Carbamates pesticides; Carbaryl; Fungicides; Metalaxyl; Watersheds