Moreau, Magali published the artcileA baseline assessment of emerging organic contaminants in New Zealand groundwater, Product Details of C18H19Cl2NO4, the main research area is emerging organic contaminant baseline assessment groundwater pollution New Zealand; Emerging organic contaminant; Groundwater; Groundwater quality; Monitoring; New Zealand; Waikato region.
Emerging organic contaminants (EOC) are manufactured compounds, used for a variety of purposes, are a rising concern for freshwater quality and human and aquatic health. Their occurrence in groundwater was demonstrated in several international surveys. This work conducted the first baseline survey on EOC occurrence in New Zealand groundwater, using a wide-screening approach (723 compounds) and a novel stratified to mean residence time (MRT) randomized design to inform future monitoring. A total of 61 sites were sampled: 51 baseline sites from State of the Environment network in the Waikato region, and 10 targeted sites near known EOC sources for comparison. EOC were detected at 91% of baseline sites at concentrations of 0.1-11,000 ng/L. Multiple EOC groups were encountered: pesticides (48 compounds), pharmaceuticals (11), industrial (10), preservatives/food additives (3), and personal care products (1). Similar EOC diversity and concentration range were observed at targeted sites, with the addition of drugs of abuse and life-style compounds EOC detections occurred across young (1-11 yr. MRT), intermediate (11-50 yr. MRT), and old (50-250 yr. MRT) groundwater with higher concentrations and more types of EOC detected at sites with the youngest groundwater. Concentrations of 73 compounds detected at baseline sites were comparable to those observed in overseas groundwater, with 28 compounds measured at concentrations greater than the European Union maximum admissible concentration for pesticides. Survey results were used to: review current pesticide monitoring; propose complementary monitoring; identify potential EOC groundwater tracers; and identify compounds for which cost-effective, national laboratory capability is needed. Waikato survey results demonstrated ubiquitous occurrence of un-monitored, unregulated EOC in groundwater and limitations for using targeted approaches to establish monitoring.
Science of the Total Environment published new progress about Aquifers. 72509-76-3 belongs to class pyridine-derivatives, name is 3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C18H19Cl2NO4, Product Details of C18H19Cl2NO4.