Pesticide pollution of the Triassic Sandstone aquifer of South Yorkshire

Gooddy, Daren C.; Stuart, Marianne; Lapworth, Dan; Chilton, P.J.; Bishop, S.; Cachandt, Gerd; Knapp, M.; Pearson, T.H.

doi:10.1144/1470-9236/04-012

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…As pointed out by Morvan et al (2006), few studies have tried to estimate the trend of groundwater contamination after a pesticide has been banned. In a study focusing on a sandstone aquifer by Gooddy et al (2005), pesticides sampled in groundwater over a period of 18 months did not show any trend. In a countrywide case study focusing on atrazine and its metabolite desethylatrazine presented for Germany by Tappe et al (2002), persistence in groundwater was common occurrence.…”

Section: Introductionmentioning

confidence: 91%

Predicting Pesticide Attenuation in a Fractured Aquifer Using Lumped‐Parameter Models

Farlin¹,

Gallé²,

Bayerle³

et al. 2012

Groundwater

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Neighboring springs draining fractured-rock aquifers can display large differences in water quality and flow regime, depending on local variations of the connectivity and the aperture size distribution of the fracture network. Consequently, because homogeneous equivalent parameters cannot be assumed a priori for the entire regional aquifer, the vulnerability to pollution of such springs has to be studied on a case by case basis. In this paper, a simple lumped-parameter model usually applied to estimate the mean transit time of water (or tracer) is presented. The original exponential piston-flow model was modified to take land-use distribution into account and applied to predict the evolution of atrazine concentration in a series of springs draining a fractured sandstone aquifer in Luxembourg, where despite a nationwide ban in 2005, atrazine concentrations still had not begun to decrease in 2009. This persistence could be explained by exponentially distributed residence times in the aquifer, demonstrating that in some real world cases, models based on the groundwater residence time distribution can be a powerful tool for trend reversal assessments as recommended for instance by current European Union guidelines.

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Section: Introductionmentioning

confidence: 91%

Predicting Pesticide Attenuation in a Fractured Aquifer Using Lumped‐Parameter Models

Farlin¹,

Gallé²,

Bayerle³

et al. 2012

Groundwater

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“…Recently the occurrence of both pesticides and their metabolites within groundwater have been identified (Kolpin et al, 1996(Kolpin et al, , 2004Gooddy et al, 2002Gooddy et al, , 2005Johnson et al, 2001;Postle et al, 2004). Pesticides in groundwater have been found to originate from arable land (e.g.…”

Section: Introductionmentioning

confidence: 99%

The significance of colloids in the transport of pesticides through Chalk

Gooddy

Mathias

Harrison

et al. 2007

Science of The Total Environment

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Agrochemical contamination in groundwater poses a significant long term threat to water quality and is of concern for legislators, water utilities and consumers alike. In the dual porosity, dual permeability aquifers such as the Chalk aquifer, movement of pesticides and their metabolites through the unsaturated zone to groundwater is generally considered to be through one of two pathways; a rapid by-pass flow and a slower 'piston-flow' route via the rock matrix. However, the dissolved form or 'colloidal species' in which pesticides move within the water body is poorly understood. Following heavy rainfall, very high peaks in pesticide concentration have been observed in shallow Chalk aquifers. These concentrations might be well explained by colloidal transport of pesticides. We have sampled a Chalk groundwater beneath a deep (30 m) unsaturated zone known to be contaminated with the pesticide diuron. Using a tangential flow filtration technique we have produced colloidal fractions from 0.45µm to 1kDa. In addition, we have applied agricultural grade diuron to a typical chalk soil and created a soil water suspension which was also subsequently fractionated using the same filtration system. The deep groundwater sample showed no evidence of association between colloidal material and pesticide concentration. In comparison, despite some evidence of particle trapping or sorption to the filters, the soil water clearly showed an association between the <0.45µm and <0.1µm colloidal fractions which displayed significantly higher pesticide concentrations than the unfiltered sample.Degradation products were also observed and found to behave in a similar manner to the parent compound. Although relatively large colloids can be generated in the Chalk soil zone, 2 it appears transport to depth in a colloidal-bound form does not occur. Comparison with other field and monitoring studies suggests that rapid by-pass flow is unlikely to occur beneath 4-5 m. Therefore, shallow groundwaters are most at risk from rapid transport of high concentrations of pesticide-colloidal complexes. The presence of a deep unsaturated zone will mean that most of the colloidal-complexes will be filtered by the narrow chalk pores and the majority of pesticide transport will occur in a 'dissolved' form through the more gradual 'piston-flow' route.

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“…The combination of mixed farming and smallholdings with potential mixed and multiple diffuse and point sources of pesticide pollution is also common in lowland areas of sandstone outcrop. Together these factors mean that the experience here is also likely to be representative of pesticide pollution problems at many sites, and even thorough surveys of the catchment may not be able to identify the sources or pathways (Gooddy et al 2005). Despite the implementation of a complex, yet highly flexible ground water modeling tool, this work demonstrated that the source of the pesticide problem could not be identified or controlled.…”

Section: Discussionmentioning

confidence: 99%

A Field and Modeling Study to Determine Pesticide Occurrence in a Public Water Supply in Northern England, UK

Stuart¹,

Gooddy²,

Hughes³

et al. 2006

Groundwater Monitoring Rem

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In the UK, increasing numbers of pesticides are being detected in ground water as monitoring programs are developed and analytic techniques are refined. This study describes the investigation of pesticides at a site on the Triassic Sandstone aquifer of northern England. Drilling and pore water sampling demonstrated the presence of agricultural herbicides in the unsaturated zone of the aquifer close to a public supply well site at which elevated pesticide concentrations had been detected in the abstracted ground water. These were similar to the compounds detected in the supply wells, but there was no evidence for some of these having been used at the nearby farm. Modeling of water movement to wells showed that individual ground water flow subcatchments were retained during a monthly duty cycle and should be well‐defined. Detecting and quantifying the sources of pesticide pollution of ground water was unsuccessful, probably due to local land use and aquifer heterogeneity. This remains difficult even where the overall catchment is small (1‐km radius) and there are apparently few possible point sources. Even with sophisticated flow models, there is still a high degree of uncertainty in modeling pesticide movement, and treatment of ground water may be the only viable option for water utilities.

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Pesticide pollution of the Triassic Sandstone aquifer of South Yorkshire

Cited by 15 publications

References 17 publications

Predicting Pesticide Attenuation in a Fractured Aquifer Using Lumped‐Parameter Models

Predicting Pesticide Attenuation in a Fractured Aquifer Using Lumped‐Parameter Models

The significance of colloids in the transport of pesticides through Chalk

A Field and Modeling Study to Determine Pesticide Occurrence in a Public Water Supply in Northern England, UK

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