Long-term leaching through clayey till of N,N-dimethylsulfamide, a Persistent and Mobile Organic Compound (PMOC)

Predicting the Impact and Duration of Persistent and Mobile Organic Compounds in Groundwater Systems Using a Contaminant Mass Discharge Approach

“…Using DMS as an example, this study aims to 1) predict the duration of a PMOC affecting a drinking water well field and compare the different tools to do so, and 2) apply CMD to identify the PMOC sources at catchment scale. This study extends the findings from Frederiksen et al (2023), who investigated retention of PMOCs in clayey till by fracture-matrix interactions. We apply simulation of the temporal development of contaminant mass discharge in combination with other methods to predict the impact and duration of contamination for water supply wells and support identification of contaminant sources in the catchment area.…”

“…1). The main sources of interest in this study are the well-characterized diffuse sources DW and DE (Frederiksen et al, 2023), and source BK is also expected to be a diffuse source from horticulture, however, the presence of an unknown point source cannot be ruled out.…”

“…The geology and hydrogeology at the site were characterized based on a combination of soil samples from the installation of boreholes and depth-discrete high-resolution estimates of the permeability from a hydraulic profiling tool (HPT) (Dutta et al, 2021;Frederiksen et al, 2023;McCall and Christy, 2020).…”

“…A total of 253 groundwater samples were collected (Table 2). Aside from permanent wells screened in the sand aquifer or the limestone aquifer, samples were collected by a direct push method from the sand aquifer (Frederiksen et al, 2023;McCall et al, 2014). 1-5 samples were taken in each direct push location; the sampling depths were selected based on preliminary survey with a hydraulic profiling tool (HPT) (McCall and Christy, 2020).…”

“…It is a highly persistent and mobile compound with a DT 50 in topsoil of 41-1325 d (Albers et al, 2023a;Dalkmann et al, 2012;European Chemicals Agency, 2016b) and a K d value below 0.2 L/kg in all sediments tested (Albers et al, 2023a). A characterization of DMS as a PMOC is presented in Frederiksen et al (2023).…”