Monitoring herbicide concentrations and loads during a flood event: a comparison of grab sampling with passive sampling

Novic, Andrew Joseph, O'Brien, Dominique S., Kaserzon, Sarit L., Hawker, Darryl W., Lewis, Stephen E., and Mueller, Jochen F. (2017) Monitoring herbicide concentrations and loads during a flood event: a comparison of grab sampling with passive sampling. Environmental Science and Technology, 51 (7). pp. 3880-3891.

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The suitability of passive samplers (Chemcatcher) as an alternative to grab sampling in estimating time-weighted average (TWA) concentrations and total loads of herbicides was assessed. Grab sampling complemented deployments of passive samplers in a tropical waterway in Queensland, Australia, before, during and after a flood event. Good agreement was observed between the two sampling modes in estimating TWA concentrations that was independent of herbicide concentrations ranging over 2 orders of magnitude. In a flood-specific deployment, passive sampler TWA concentrations underestimated mean grab sampler (n = 258) derived concentrations of atrazine, diuron, ametryn, and metolachlor by an average factor of 1.29. No clear trends were evident in the ratios of load estimates from passive samplers relative to grab samples that ranged between 0.3 and 1.8 for these analytes because of the limitations of using TWA concentrations to derive flow-weighted loads. Stratification of deployments by flow however generally resulted in noticeable improvements in passive sampler load estimates. By considering the magnitude of the uncertainty (interquartile range and the root-mean-squared error) of load estimates a modeling exercise showed that passive samplers were a viable alternative to grab sampling since between 3 and 17 grab samples were needed before grab sampling results had less uncertainty.

Item ID: 53347
Item Type: Article (Research - C1)
ISSN: 1520-5851
Funders: Queensland Department of Health (QDH), Australian Research Council (ARC), The University of Queensland (UQ)
Projects and Grants: ARC FT120100546
Date Deposited: 27 Apr 2018 01:37
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 100%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 100%
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