Spatial and temporal variability in pesticide exposure downstream of a heavily irrigated cropping area: application of different monitoring techniques

O'Brien, Dominique, Lewis, Stephen, Davis, Aaron, Gallen, Christie, Smith, Rachael, Turner, Ryan, Warne, Michael, Turner, Scott, Caswell, Stewart, Mueller, Jochen F., and Brodie, Jon (2016) Spatial and temporal variability in pesticide exposure downstream of a heavily irrigated cropping area: application of different monitoring techniques. Journal of Agricultural and Food Chemistry, 64 (20). pp. 3975-3989.

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Abstract

Pesticide exposure threatens many freshwater and estuarine ecosystems around the world. This study examined the temporal and spatial trends of pesticide concentrations in a waterway within an agriculturally developed dry-tropics catchment using a combination of grab and passive sampling methods over a continuous two-year monitoring program. A total of 43 pesticide residues were detected with 7 pesticides exceeding ecologically relevant water quality guidelines/trigger values during the study period and 4 (ametryn, atrazine, diuron, and metolachlor) of these exceeding guidelines for several months. The presence and concentration of the pesticides in the stream coincided with seasonal variability in rainfall, harvest timing/cropping cycle, and management changes. The sampling approach used demonstrates that the application of these complementary sampling techniques (both grab and passive sampling methods) was effective in establishing pesticide usage patterns in upstream locations where application data are unavailable.

Item ID: 43464
Item Type: Article (Refereed Research - C1)
Keywords: Great Barrier Reef, pesticides, herbicides, passive sampling, sugar cane, irrigation
ISSN: 1520-5118
Funders: Reef Rescue Research and Development (RRRD)
Projects and Grants: RRRD038
Date Deposited: 31 Jul 2016 22:27
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050206 Environmental Monitoring @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 100%
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