Pesticide Detections, BenchmarkExceedances, and Temporal Trends inSurface Water of California’s Imperial,Salinas, and Santa Maria Valleys

Deng, Xin; Wagner, Scott A.; Wang, Dan; Luo, Yuzhou; Goh, Kean S.

doi:10.1021/bk-2019-1308.ch008

Cited by 7 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several chemicals detected from these sites are known to have sublethal effects on D. magna , including IMI, CHL, bifenthrin, clothianidin, malathion, methomyl, and lambda-cyhalothrin [ 40 , 54 , 55 , 56 , 57 ]. The changes in pesticide composition and concentration between the sampling dates concurred with results from previous chemical analyses in this region [ 42 ]. Pesticides of concern including CHL and IMI were detected at higher concentrations after the first flush event ( Table S2 ).…”

Section: Discussionsupporting

confidence: 86%

“…Due to the intense agricultural activity in this area, complex mixtures of many pesticide classes are frequently detected in runoff. Surface water monitoring has been routinely conducted in this area for more than ten years by the California Department of Pesticide Research (CDPR) and the Central Coast Regional Water Quality Control Board [ 42 ]. Analytical chemistry data from these monitoring efforts document frequent detections of many global pesticides of concern, including CHL, IMI, other neonicotinoids, pyrethroids, and other pesticides used in California [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Swimming Behavior of Daphnia magna Is Altered by Pesticides of Concern, as Components of Agricultural Surface Water and in Acute Exposures

Egan

Stinson

Deng

et al. 2023

Biology

View full text Add to dashboard Cite

Pesticides with novel modes of action including neonicotinoids and anthranilic diamides are increasingly detected in global surface waters. Little is known about how these pesticides of concern interact in mixtures at environmentally relevant concentrations, a common exposure scenario in waterways impacted by pesticide pollution. We examined effects of chlorantraniliprole (CHL) and imidacloprid (IMI) on the sensitive invertebrate, Daphnia magna. Exposures were first performed using surface waters known to be contaminated by agricultural runoff. To evaluate the seasonal variation in chemical concentration and composition of surface waters, we tested surface water samples taken at two time points: during an extended dry period and after a first flush storm event. In surface waters, the concentrations of CHL, IMI, and other pesticides of concern increased after first flush, resulting in hypoactivity and dose-dependent photomotor responses. We then examined mortality and behavior following single and binary chemical mixtures of CHL and IMI. We detected inverse photomotor responses and some evidence of synergistic effects in binary mixture exposures. Taken together, this research demonstrates that CHL, IMI, and contaminated surface waters all cause abnormal swimming behavior in D. magna. Invertebrate swimming behavior is a sensitive endpoint for measuring the biological effects of environmental pesticides of concern.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Swimming Behavior of Daphnia magna Is Altered by Pesticides of Concern, as Components of Agricultural Surface Water and in Acute Exposures

Egan

Stinson

Deng

et al. 2023

Biology

View full text Add to dashboard Cite

show abstract

“…Many water soluble pesticides such as neonicotinoids are not effectively treated by VTS (Stang et al 2016) and the use and detections of this class of insecticides are increasing in agricultural regions of California (Deng 2015;Deng et al 2019). Imidacloprid is used in conjunction with pyrethroids on most lettuce crops in the Salinas Valley, and has recently been detected in irrigation runoff in the central coast region.…”

Section: Introductionmentioning

confidence: 99%

Treating Agricultural Runoff With A Mobile Carbon Filtration Unit

Phillips

McCalla

Siegler

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Several classes of pesticides have been shown to impair water quality in California, including organophosphates, pyrethroids and neonicotinoids. Vegetative treatment systems (VTS) can reduce pesticide loads and associated toxicity in agricultural runoff, but many water soluble pesticides such as neonicotinoids are not effectively treated by VTS, and VTS installation is not always an option for growers required to remove non-crop vegetation for food safety concerns. Recent studies have shown that biochar filtration can be used to remove soluble contaminants, especially when coupled with other VTS components. We evaluated a mobile carbon filter system consisting of a trailer-mounted tank containing approximately 600L of biochar. Input water from a 1080 acre agricultural drainage was pre-filtered and treated with biochar during two multi-week study periods. Laboratory toxicity tests, and chemical and nutrient analyses were conducted on input and output water. Pesticide concentrations were initially reduced by greater than 99%. Treatment efficacy declined linearly and was expected to remain at least 50% effective for up to 34 weeks. Toxicity was assessed with Ceriodaphnia dubia, Hyalella azteca and Chironomus dilutus. Significant input toxicity was reduced to non-toxic levels in 6 of 16 samples. Some input concentrations of the neonicotinoid imidacloprid and the pyrethroid cypermethrin exceeded organism-specific toxicity thresholds and benchmarks, but the overall causes of toxicity were complex mixtures of agricultural chemicals. Nutrients were not reduced by the biochar. Results demonstrate the utility of biochar in treating agricultural runoff, and provide measures of the longevity of biochar under field conditions.

show abstract

“…Many water-soluble pesticides such as neonicotinoids are not effectively treated by VTS (Stang et al 2016 ) and the use and detections of this class of insecticides are increasing in agricultural regions of California (Deng 2015 ; Deng et al 2019 ). Imidacloprid is used in conjunction with pyrethroids on most lettuce crops in the Salinas Valley, and has recently been detected in irrigation runoff in the Central Coast region.…”

mentioning

confidence: 99%

Treating Agricultural Runoff with a Mobile Carbon Filtration Unit

Phillips

Fuller

Siegler

et al. 2022

Arch Environ Contam Toxicol

Self Cite

View full text Add to dashboard Cite

Several classes of pesticides have been shown to impair water quality in California, including organophosphates, pyrethroids and neonicotinoids. Vegetative treatment systems (VTS) can reduce pesticide loads and associated toxicity in agricultural runoff, but many water-soluble pesticides such as neonicotinoids are not effectively treated by VTS, and VTS installation is not always an option for growers required to remove non-crop vegetation for food safety concerns. Recent studies have shown that biochar filtration can be used to remove soluble contaminants, especially when coupled with other VTS components. We evaluated a mobile carbon filter system consisting of a trailer-mounted tank containing approximately 600L (~ 180 kg) of biochar. Input water from a 437-hectare agricultural drainage was pre-filtered and treated with biochar during two multi-week study periods. Laboratory toxicity tests and chemical and nutrient analyses were conducted on input and output water. Pesticide concentrations were initially reduced by greater than 99%. Treatment efficacy declined linearly and was expected to remain at least 50% effective for up to 34 weeks. Toxicity was assessed with Ceriodaphnia dubia, Hyalella azteca and Chironomus dilutus. Significant input toxicity was reduced to non-toxic levels in 6 of 16 samples. Some input concentrations of the neonicotinoid imidacloprid and the pyrethroid cypermethrin exceeded organism-specific toxicity thresholds and benchmarks, but the overall causes of toxicity were complex mixtures of agricultural chemicals. Nutrients were not reduced by the biochar. Results demonstrate the utility of biochar in treating agricultural runoff and provide measures of the longevity of biochar under field conditions.

show abstract

Pesticide Detections, BenchmarkExceedances, and Temporal Trends inSurface Water of California’s Imperial,Salinas, and Santa Maria Valleys

Cited by 7 publications

References 7 publications

Swimming Behavior of Daphnia magna Is Altered by Pesticides of Concern, as Components of Agricultural Surface Water and in Acute Exposures

Swimming Behavior of Daphnia magna Is Altered by Pesticides of Concern, as Components of Agricultural Surface Water and in Acute Exposures

Treating Agricultural Runoff With A Mobile Carbon Filtration Unit

Treating Agricultural Runoff with a Mobile Carbon Filtration Unit

Contact Info

Product

Resources

About