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Show simple item record Nsibande, SA Dabrowski, James M van der Walt, E Venter, A Forbes, PBC 2016-06-27T08:46:52Z 2016-06-27T08:46:52Z 2015-06
dc.identifier.citation Nsibande SA, Dabrowski JM, van der Walt E, Venter A and Forbes PBC. 2015. Validation of the AGDISP model for predicting airborne atrazine spray drift: a South African ground application case study. In: Chemosphere, 138, pp 454-461 en_US
dc.identifier.issn 0045-6535
dc.description Copyright 2015. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website en_US
dc.description.abstract Air dispersion software models for evaluating pesticide spray drift during application have been developed that can potentially serve as a cheaper convenient alternative to field monitoring campaigns. Such models require validation against field monitoring data in order for them to be employed with confidence, especially when they are used to implement regulatory measures or to evaluate potential human exposure levels. In this case study, off-target pesticide drift was monitored during ground application of a pesticide mixture to a sorghum field in South Africa. Atrazine was used as a drift tracer. High volume air sampling onto polyurethane foam (PUF) was conducted at six downwind locations and at four heights at each sampling point. Additional data, including meteorological information, required to simulate the spray drift with the AGDISP® air dispersion model was collected. The PUF plugs were extracted by a plunger method utilizing a hexane:acetone mixture with analysis by GC-NPD (94.5% recovery, 3.3% RSD, and LOD 8.7pg). Atrazine concentrations ranged from 4.55ngL(-1) adjacent to the field to 186pgL(-1) at 400m downwind. These results compared favourably with modeled output data, resulting in the validation of the model up to 400m from the application site for the first time. Sensitivity studies showed the importance of droplet size distribution on spray drift, which highlighted the need for good nozzle maintenance. Results of this case study indicate that the model may provide meaningful input into environmental and human health risk assessment studies in South Africa and other developing countries. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;15454
dc.subject Atrazine en_US
dc.subject Spray drift en_US
dc.subject Air dispersion modeling en_US
dc.subject Polyurethane foam en_US
dc.subject PUF en_US
dc.subject Pesticides en_US
dc.subject AGricultural DISPersal model en_US
dc.subject AGDISP en_US
dc.title Validation of the AGDISP model for predicting airborne atrazine spray drift: a South African ground application case study en_US
dc.type Article en_US

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