Relevance of urban glyphosate use for surface water quality

Short-term transport of glyphosate with erosion in Chinese loess soil — A flume experiment

“…In highly erodible land, together with runoff and suspended load, glyphosate and AMPA, supposedly, are transported, deposited, and probably accumulated in nearby areas (Ulén et al, 2014). However, the occurrence of glyphosate cannot be explained by agricultural use only attributing to the comparison of agricultural application and the seasonal concentration and load pattern (Botta et al, 2009;Hanke et al, 2010;Huang et al, 2004;Kolpin et al, 2006). The freely glyphosate and AMPA from farmland or urban sewer are dissolved in runoff/water involving dilution, dissipation and degradation in the receiving water system (Harmon, 2008;Majewski et al, 2014).…”

Sources of aminomethylphosphonic acid (AMPA) in urban and rural catchments in Ontario, Canada: Glyphosate or phosphonates in wastewater?

“…Unfortunately we were unable to record stream flow for the whole time period. Others have reported peak concentrations of glyphosate in streams associated with runoff events (Botta et al, 2009;Hanke et al, 2010). Also, Coupe et al (2012) and Battaglin et al (2014) reported that AMPA concentrations increased in US agricultural streams as AMPA concentrations increased in soils after glyphosate application and became more available for runoff.…”

“…Recently some researchers have reported that detection of AMPA in surface water is not diagnostic as a tracer for glyphosate because AMPA is also a metabolite of other phosphonate compounds, such as detergents (Botta et al, 2009;Hanke et al, 2010). For example, Botta et al (2009) stated that for catchments impacted by urban development, under dry weather conditions, "… detergent degradation seemed to represent the source of AMPA in surface water receiving treated wastewater."…”

Re-registration Challenges of Glyphosate in the European Union

“…glyphosate have also been indicated (Kolpin et al, 2006;Botta et al, 2009;Hanke et al, 2010;Glozier et al, 2012) to contribute to environmental contamination. Soil contamination appears to show a closer correlation with agricultural usage intensity, while water contamination results from run-off events by precipitation (Landry et al, 2005;Maqueda et al, 2017;Poiger et al, 2017).…”