Groundwater Vulnerability to Pesticide Contamination on a Regional Scale

Soutter, Marc; Pannatier, Yvan

doi:10.2134/jeq1996.00472425002500030009x

Cited by 33 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These functions relate hydraulic parameters to easily measured sediment properties such as percent sand, silt, and clay, and are commonly used at regional scales owing to the difficulty and cost of directly measuring hydraulic conductivity (Görres and Gold, 1996;Petach et al, 1991;Soutter and Pannatier, 1996). A companion study evaluated the spatial variability of the recharge estimates and analyzed relations with sediment, landscape, and water-quality data.…”

Section: Introductionmentioning

confidence: 99%

Factors influencing ground-water recharge in the eastern United States

Nolan

Healy

Taber

et al. 2007

Journal of Hydrology

106

View full text Add to dashboard Cite

Kerie J.; and Wolock, David M., "Factors influencing ground-water recharge in the eastern United States" (2007). USGS Summary Ground-water recharge estimates for selected locations in the eastern half of the United States were obtained by Darcian and chloride-tracer methods and compared using statistical analyses. Recharge estimates derived from unsaturated-zone (R UZC ) and saturated-zone (R SZC ) chloride mass balance methods are less variable (interquartile ranges or IQRs are 9.5 and 16.1 cm/yr, respectively) and more strongly correlated with climatic, hydrologic, land use, and sediment variables than Darcian estimates (IQR = 22.8 cm/yr). The unit-gradient Darcian estimates are a nonlinear function of moisture content and also reflect the uncertainty of pedotransfer functions used to estimate hydraulic parameters. Significance level is <0.001 for nearly all explanatory variables having correlations with R UZC of <À0.3 or >0.3. Estimates of R SZC were evaluated using analysis of variance, multiple comparison tests, and an exploratory nonlinear regression (NLR) model. Recharge generally is greater in coastal plain surficial aquifers, fractured crystalline rocks, and carbonate rocks, or in areas with high sand content. Westernmost portions of the study area have low recharge, receive somewhat less precipitation, and contain fine-grained sediment. The NLR model simulates water input to the land surface followed by transport to ground water, depending on factors that either promote or inhibit water infiltration. The model explains a moderate amount of variation in the data set (coefficient of determination = 0.61). Model sensitivity analysis indicates that mean annual runoff, air temperature, and precipitation, and an index of ground-water exfiltration potential most influence estimates of recharge at sampled sites in the region. Soil characteristics and land use have less influence on the recharge estimates, but nonetheless are significant in the NLR model. ª

show abstract

Section: Introductionmentioning

confidence: 99%

Factors influencing ground-water recharge in the eastern United States

Nolan

Healy

Taber

et al. 2007

Journal of Hydrology

106

View full text Add to dashboard Cite

show abstract

“…Contamination of groundwater by pesticides has brought increased environmental concern over the past decade (Foster et al, 1991;Soutter and Pannatier 1996;Chilton et al, 2000;Foster 2000;Gaus 2000). In the United States, a considerable body of work exists relating to the occurrence of both parent compound pesticides and their metabolites in aquifers (Thurman et al, 1992;Baker et al, 1993;Lawrence et al, 1993;Kolpin et al, 1996;Kolpin et al, 1998;Kolpin et al, 2000a;Kolpin et al, 2000b).…”

Section: Introductionmentioning

confidence: 99%

A field study to assess the degradation and transport of diuron and its metabolites in a calcareous soil

Gooddy

Chilton

Harrison

2002

Science of The Total Environment

104

View full text Add to dashboard Cite

An experimental plot has been established on a calcareous soil in southern England to investigate the fate and transport of diuron (N'-[3,4-dichlorophenyl]-N,N-dimethylurea), a commonly used phenylurea herbicide. An agricultural grade of diuron was applied to the soil surface at a rate of 6.7 kg/ha along with a potassium bromide conservative tracer applied at 200 kg/ha in early January 2001. Hand augured samples were taken at regular intervals over the next 50 days with samples collected down to 54 cm. Porewaters were extracted from the soil cores by using high speed centrifugation and the supernatant fluids were retained for analysis by HPLC for diuron and three of its metabolites, N'- [3,, N'-3,4-dichlorophenylurea (DCPU) and 3,4-dichloroaniline (DCA). The centrifuged soil was retained and then extracted with methanol prior to HPLC analysis for the same suite of phenylureas. A mass balance approach showed large variations in diuron distribution but on average accounted for 104% of the diuron applied. Concentrations of diuron and its metabolites were roughly five times higher in the soil than in the soil porewaters. After 50 days metabolites comprised 10% of the total diuron present in the porewater and 20% of the total diuron sorbed to the soil matrix. After 36 days a large pulse of diuron and DCPMU appeared in the porewaters and soil matrix at a depth of 54 cm, travelling an average of 0.15 cm/d faster than Br. A preferential route for diuron transport is suggested. There is evidence to suggest that degradation occurs at depth as well as at the soil surface. Metabolites generally appear to move more slowly than the parent compound. All metabolites were encountered but interpreting transport and degradation processes simultaneously proved beyond the scope of the study. Diuron was detected once in a shallow (5 m) observation well situated on the experimental plot. High concentrations of diuron and metabolites were still present in the soil and soil solutions after 50 days and remain as a source of potential groundwater contamination.

show abstract

“…[14] Numerous applications based on gas chromatography coupled with mass spectrometry (GC-MS) have been reported for the determination of pesticides in water samples. [15,16] Recognizing the negative effects of water contamination by pesticides [17,18,19,20] and the lack of effective analytical projects in Lebanon, this work reports for the first time, the detection and quantification of pesticides in surface water and groundwater (GW) samples collected from South Litani region in particular during the four seasons of year 2012. An optimized and validated SPE followed by GC-MS [21] was applied for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Occurrence and levels of pesticides in South Lebanon water

Youssef

Younes

Kouzayha

et al. 2015

Chemical Speciation & Bioavailability

View full text Add to dashboard Cite

This study reviews the detection of pesticides in different surface and groundwater samples collected from South Litani region in South Lebanon during 2012. These have been analyzed using an optimized and validated solid phase extraction method followed by gas chromatography coupled with mass spectrometry. Organochlorine and organophosphate pesticides were mostly noted at levels below the recommended value for individual pesticide in water except pirimiphosmethyl that was recorded at 300.87 ng L −1 in groundwater sample, designated for drinking water and collected in February. DDE concentration exceeded 100 ng L −1 in both surface and groundwater in October. The reported results represent the first Lebanese statistical data illustrating the quantification of pesticides in water over a period of time. More importantly, it draws attention to the need of pesticides' monitoring programs in the Lebanese water resources.

show abstract

Groundwater Vulnerability to Pesticide Contamination on a Regional Scale

Cited by 33 publications

References 0 publications

Factors influencing ground-water recharge in the eastern United States

Factors influencing ground-water recharge in the eastern United States

A field study to assess the degradation and transport of diuron and its metabolites in a calcareous soil

Occurrence and levels of pesticides in South Lebanon water

Contact Info

Product

Resources

About