Insecticide Washoff from Concrete Surfaces: Characterization and Prediction

Luo, Yuzhou; Jorgenson, Brant C.; Thuyet, Dang Quoc; Young, Thomas M.; Spurlock, Frank; Goh, Kean S.

doi:10.1021/es4028343

Cited by 18 publications

(17 citation statements)

References 33 publications

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“…As mentioned previously, the loss of washoff potential during the dry period after application is attributed to pesticide degradation and irreversible adsorption to concrete matrix. This is further confirmed by fitting the total washoff losses into a pseudo-first-order kinetics (15,20), and suggests that the transferability of a pesticide from impervious surfaces to runoff water after application is initially high, but decreases quickly over time. Systematical simulations for the time-dependence of the effective dissipation rate constant are not available in modeling approaches by empirical equations or by PRZM.…”

Section: A Semi-mechanistic Model Based On Experimental Data Implicatmentioning

confidence: 63%

“…Two time systems are presented in Figure 1: t d accounts for the duration of the dry period since the last pesticide application, and t describes the washing time. Published washoff experiments for pesticides from impervious surfaces have been reviewed previously (19,20). According to measure washoff loads, M W (T), usually only a small portion of applied mass could be detected in the runoff, even with a short set time, suggesting a rapid initial dissipation.…”

Section: Characterization Of Pesticide Washoffmentioning

confidence: 99%

“…Washoff measurements were taken from CDPR-supported experiments under controlled rainfall of approximately 25mm/hr for 1 hour (3,4,16,20). Pesticide washoff loads were measured from pre-washed concrete surfaces at various set times.…”

Section: Transport Modeling With Impervious Scenariosmentioning

confidence: 99%

“…Figure 3. PRZM-predicted pesticide washoff loads from impervious surfaces relative to measurements (3,4,16,20), (a) with repeated soil K d (partitioning coefficient), and (b) with K d calibrated to measurements at 1DAA (days after application). Open circles for data at 1DAA (days after application) and closed circles for those >1DAA.…”

Section: Transport Modeling With Impervious Scenariosmentioning

confidence: 99%

“…For example, Thuyet et al (16) applied power-law functions to fit washoff profiles of imidacloprid from concrete surfaces, and the results indicated that the regression coefficients must be calibrated separately for each of the washoff profiles with various set times. Similarly, power-law exponents (m values) were estimated for measured washoff data of commonly used insecticides from 21 controlled rainfall events with R 2 ranging from 0.86 to 1.00 (20). Small m values were observed with a short set time for all tested pesticides.…”

Section: A Semi-mechanistic Model Based On Experimental Data Implicatmentioning

confidence: 99%

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Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Luo

2014

ACS Symposium Series

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Pesticide uses on impervious surfaces and subsequent offsite transport significantly contribute to pesticide detection and aquatic toxicity in urban watersheds. This review evaluates the various methods that currently exist to model pesticide washoff from impervious surfaces. Empirical equations successfully describe pesticide washoff by calibration to a single rainfall event, but lack consistent parameterization with varying set time and repeated rainfall. Partitioning coefficients determined from experimental data could significantly improve PRZM capability in predicting pesticide washoff from impervious surfaces. Highlighted in this review is a new semi-mechanistic approach which incorporates the time-dependence of washoff potential during the dry period after application and washoff dynamics during a runoff event. This review aims to provide information to guide model selection and model development for pesticide registration, regulation, and mitigation for urban pesticide uses. IntroductionPesticide transport in urban watersheds is a function of stormwater hydrology, various processes that control transport in watercourses, and the dynamics of pesticide release and washoff from treated surfaces. While stormwater modeling and pesticide transport in runoff have been extensively investigated, relatively few studies have evaluated pesticide washoff from urban landscapes, especially from impervious surfaces. Impervious surfaces are primary sources of overland flow generation in the urban environment. Impervious surfaces are often directly treated with pesticides in structural pest control applications, paved area applications, and incidental overspray or drift (1, 2). Previous studies suggest that impervious surfaces are the dominant contributors to pesticide movement off-site in urban areas (3-5). Compared to other surfaces such as turf and bare soils, limited knowledge is available on the dynamics of pesticide buildup and washoff on impervious surfaces. The California Department of Pesticide Regulation (CDPR) recently adopted new regulations to protect water quality in urban areas by restricting pyrethroid application amounts and certain contact areas (6). Thus, there is an emerging research need for improved washoff modeling capabilities to evaluate the effectiveness of the regulations and extrapolate the effect of mitigation practices to different conditions.The physical processes and modeling approaches of urban pollutant washoff and runoff have been reviewed in previous studies (7-13). Most of the reviews focus on pesticide transport in overland flow, concentrated flow and/or pipe flow over urban landscapes. This chapter reviews existing modeling approaches for simulating pesticide washoff from impervious surfaces, and introduces a semi-mechanistic model developed based on washoff experiments data. The models discussed here are classified as empirical or mechanistic (or semi-mechanistic) approaches. The empirical models are based on statistical analysis and data fitting and do not explicitly simulate mass t...

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Section: A Semi-mechanistic Model Based On Experimental Data Implicatmentioning

confidence: 63%

Section: Characterization Of Pesticide Washoffmentioning

confidence: 99%

Section: Transport Modeling With Impervious Scenariosmentioning

confidence: 99%

Section: Transport Modeling With Impervious Scenariosmentioning

confidence: 99%

Section: A Semi-mechanistic Model Based On Experimental Data Implicatmentioning

confidence: 99%

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Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Luo

2014

ACS Symposium Series

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Enantiomer‐specific measurements of current‐use pesticides in aquatic systems

Ulrich

TenBrook

McMillan³

et al. 2017

Enviro Toxic and Chemistry

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Some current-use pesticides are chiral and have nonsuperimposable mirror images called enantiomers that exhibit identical physical-chemical properties but can behave differently when in contact with other chiral molecules (e.g., regarding degradation and uptake). These differences can result in variations in enantiomer presence in the environment and potentially change the toxicity of pesticide residues. Several current-use chiral pesticides are applied in urban and agricultural areas, with increased potential to enter watersheds and adversely affect aquatic organisms. The present study describes a stereoselective analytical method for the current-use pesticides fipronil, cis-bifenthrin, cis-permethrin, cypermethrin, and cyfluthrin. We show use of the method by characterizing enantiomer fractions in environmental sample extracts (sediment and water), and laboratory-dosed fish and concrete extracts previously collected by California organizations. Enantiomer fractions for most environmental samples are the same as racemic standards (equal amounts of enantiomers, enantiomer fraction = 0.5) and therefore are not expected to differ in toxicity from racemic mixtures typically tested. In laboratory-derived samples, enantiomer fractions are more frequently nonracemic and favor the less toxic enantiomer; permethrin enantiomer fractions range from 0.094 to 0.391 in one type of concrete runoff and enantiomer fractions of bifenthrin in dosed fish range from 0.378 to 0.499. We use enantiomer fractions as a screening tool to understand environmental exposure and explore ways this uncommon measurement could be used to better understand toxicity and risk. Environ Toxicol Chem 2018;37:99-106. Published 2017 Wiley Periodicals Inc. on behalf of SETAC. This article is a US government work and, as such, is in the public domain in the United States of America.

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Water Quality Impairments Due to Aquatic Life Pesticide Toxicity: Prevention and Mitigation in California, USA

Moran¹,

Anderson

Phillips

et al. 2020

Enviro Toxic and Chemistry

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The management of pesticides to protect water quality remains a significant global challenge. Historically, despite regulatory frameworks intended to prevent, minimize, and manage off‐site movement of pesticides, multiple generations of pesticide active ingredients have created a seemingly unending cycle of pesticide water pollution in both agricultural and urban watersheds. In California, the most populous and most agricultural US state, pesticide and water quality regulators realized in the 1990s that working independently of each other was not an effective approach to address pesticide water pollution. Over the years, these California agencies have developed a joint vision and have continued to develop a unified approach that has the potential to minimize pesticide risks to aquatic life through a combination of prevention, monitoring, and management actions, while maintaining pesticide availability for effective pest control. Key elements of the current California pesticide/water quality effort include: 1) pesticide and toxicity monitoring, coupled with watershed modeling, to maximize information obtained from monitoring; 2) predictive fate and exposure modeling to identify potential risks to aquatic life for new pesticide products when used as allowed by the label or to identify effective mitigation measures; and 3) management approaches tailored to the different pesticide uses, discharge sources, physical environments, and regulatory environments that exist for agricultural runoff, urban runoff, and municipal wastewater. Lessons from this effort may inform pesticide management elsewhere in the world as well as other chemical regulatory programs, such as the recently reformed US Toxic Substances Control Act and California's Safer Consumer Products regulatory program. Environ Toxicol Chem 2020;39:953–966. © 2020 SETAC

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Insecticide Washoff from Concrete Surfaces: Characterization and Prediction

Cited by 18 publications

References 33 publications

Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Review of Modeling Approaches for Pesticide Washoff from Impervious Surfaces

Enantiomer‐specific measurements of current‐use pesticides in aquatic systems

Water Quality Impairments Due to Aquatic Life Pesticide Toxicity: Prevention and Mitigation in California, USA

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