Glyphosate residues in rural groundwater, Nottawasaga River Watershed, Ontario, Canada

Stempvoort, Dale R. Van; Spoelstra, John; Senger, Natalie D.; Brown, Scott; Post, Ryan; Struger, John

doi:10.1002/ps.4218

Cited by 70 publications

(23 citation statements)

References 23 publications

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“…The Nottawasaga River has its headwaters in the Oak Ridges Moraine and discharges to Georgian Bay at Wasaga Beach. Land use in the Nottawasaga River Watershed (3147 km 2 ) consists largely of agriculture (56%), with potatoes ( Solanum tuberosum L.) and sod being major crops in the southern portion of the watershed (Van Stempvoort et al, 2016) where groundwater was collected for this study. The basin has a temperate climate and receives ∼790 mm of precipitation annually, with ∼20% coming in the form of snow (Environment and Climate Change Canada, 2017).…”

Section: Methodsmentioning

confidence: 99%

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

2017

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It has been widely documented that municipal wastewater treatment plant effluents are a major source of artificial sweeteners to surface waters. However, in rural areas, the extent to which septic systems contribute these same compounds to groundwater aquifers is largely unknown. We examined the occurrence of four commonly used artificial sweeteners in an unconfined sand aquifer that serves as a water supply for rural residents, as a receptor of domestic wastewater from septic systems, and as a source of baseflow to the Nottawasaga River, ON, Canada. Groundwater from the Lake Algonquin Sand Aquifer in the southern Nottawasaga River Watershed was collected from private domestic wells and as groundwater seeps discharging along the banks of the Nottawasaga River. Approximately 30% of samples had detectable levels of one or more artificial sweeteners, indicating the presence of water derived from septic system effluent. Using acesulfame concentrations to estimate the fraction of septic effluent in groundwater samples, ∼3.4 to 13.6% of the domestic wells had 1% or more of their well water being derived from septic system effluent. Similarly, 2.0 to 4.7% of the groundwater seeps had a septic effluent contribution of 1% or more. No relationship was found between the concentration of acesulfame and the concentration of nitrate, ammonium, or soluble reactive phosphorus in the groundwater, indicating that septic effluent is not the dominant source of nutrients in the aquifer. It is expected that the occurrence of artificial sweeteners in shallow groundwater is widespread throughout rural areas in Canada. Core Ideas Samples were collected from domestic wells and groundwater seeps in rural Ontario. Artificial sweeteners were found in >30% of rural groundwater samples. Acesulfame was used to estimate the fraction of septic effluent in groundwater. Septic effluent was not a significant source of nutrients in the aquifer.

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Section: Methodsmentioning

confidence: 99%

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

2017

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“…Glyphosate has also been indicated as a significant water pollutant from intensive agriculture in Mexico (Ruiz-Toledo et al, 2014). The concentrations of glyphosate in surface waters in the EU appears to be lower, but consistently occurring e.g., Germany (Skark et al, 1998), the Mediterranean (Barceló and Hennion, 1997), the Northern region Lode, 2001, 2002;Kjaer et al, 2005), in France (Botta et al, 2009;Van Stempvoort et al, 2016;Clausing et al, 2018) and elsewhere, and its dissipation has been found to be slowed down in formulation and in the presence of algal biofilms (Klátyik et al, 2017b). Thus, glyphosate residues have been deemed to be worldwide the most common pesticide contaminant in freshwater ecosystems, AMPA being the most frequent, glyphosate being the third most frequent contaminant in France (Villeneuve et al, 2011).…”

Section: Exposure To Glyphosate-environmental and Food Analysis Humamentioning

confidence: 99%

Re-registration Challenges of Glyphosate in the European Union

Székacs

Darvas

2018

Front. Environ. Sci.

104

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“…Glyphosate and AMPA transport can occur with favorable hydrological factors, where they are stable in soils, air or water. Van Stempvoort et al (2016) showed that glyphosate and AMPA are persistent enough to reach shallow groundwater, be stored in it and then M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 13 transferred to surface water. Leaching of glyphosate and AMPA through soil seems to be a slow, minor phenomenon, according to Bergström et al (2011).…”

Section: Transport Across Soilmentioning

confidence: 99%

AminoMethylPhosphonic acid (AMPA) in natural waters: Its sources, behavior and environmental fate

Piel²,

2017

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The widely occurring degradation product aminomethylphosphonic acid (AMPA) is a result of glyphosate and amino-polyphosphonate degradation. Massive use of the parent compounds leads to the ubiquity of AMPA in the environment, and particularly in water. The purpose of this review is to summarize and discuss current insights into AMPA formation, transport, persistence and toxicity. In agricultural soils, AMPA is concentrated in the topsoil, and degrades slowly in most soils. It can reach shallow groundwater, but rarely managed to enter deep groundwater. AMPA is strongly adsorbed to soil particles and moves with the particles towards the stream in rainfall runoff. In urban areas, AMPA comes from phosphonates and glyphosate in wastewater. It is commonly found at the outlets of Wastewater Treatment Plants (WWTP). Sediments tend to accumulate AMPA, where it may be biodegraded. Airborne AMPA is not negligible, but does wash-out with heavy rainfall. AMPA is reported to be persistent and can be biologically degraded in soils and sediments. Limited photodegradation in waters exists. AMPA mainly has its sources in agricultural leachates, and urban wastewater effluents. The domestic contribution to urban loads is negligible. There is a critical lack of epidemiological data - especially on water exposure - to understand the toxicological effects, if any, of AMPA on humans. Fortunately, well operated water treatment plants remove a significant proportion of the AMPA from water, even though there are not sufficient regulatory limits for metabolites.

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Glyphosate residues in rural groundwater, Nottawasaga River Watershed, Ontario, Canada

Cited by 70 publications

References 23 publications

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

Artificial Sweeteners Reveal Septic System Effluent in Rural Groundwater

Re-registration Challenges of Glyphosate in the European Union

AminoMethylPhosphonic acid (AMPA) in natural waters: Its sources, behavior and environmental fate

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