Estévez, E. and Cabrera, M.C. and Fernández-Vera, J.R. and Molina-Díaz, A. and Robles-Molina, J. and Palacios, M.P. (2016) Monitoring priority substances, other organic contaminants and heavy metals in a volcanic aquifer from different sources and hydrological processes. Science of The Total Environment, 551-55. pp. 186-196. ISSN 00489697
Full text not available from this repository.Abstract
Irrigation with reclaimedwater (R) is necessary to guarantee the sustainability of semi-arid areas. Results obtained during a two years monitoring network (2009–2011) in Gran Canaria are presented, including the analysis of chemical parameters, N and S isotopes, priority substances (2008/105/EC, 2013/39/EU), other organic contaminants and heavy metals in groundwater and R used to irrigate a golf course. The aims of thiswork are to evaluate the contamination in a volcanic aquifer, relate the presence of organic contaminants and heavy metals with the hydrogeochemistry and identify pollution sources in the area. No priority substance exceeded the EU thresholds for surface water, although seventeen were detected in R. The most frequent compounds were hexachlorobenzene, chlorpyrifos ethyl, fluorene, phenanthrene and pyrene. These compounds were detected at low concentration, except chlorpyrifos. Chlorpyrifos ethyl, terbuthylazine, diuron, terbutryn, procymidone, atrazine and propazine exceeded the European threshold concentration for pesticides in groundwater (100 ng L−1). Therefore, the priority substances chlorpyrifos ethyl and diuron must be included in monitoring studies. The priority pesticides chlorfenvinphos and diazinon were always detected in R but rarely in groundwater. Besides, the existence of contaminants not related to the current R irrigation has been identified. Absence of environmental problems related to heavy metals can be expected. The relationship among contaminant presence, hydrogeochemistry, including the stable isotopic prints of δ18O, δ15N and δ34S and preferential recharge paths has been described. The coastal well shows high values of EC, nitrate, a variable chemistry, and 50% of organic contaminants detected above 100 ng L−1. Thewell located in the recharge area presents a stable hydrochemistry, the lowest value of δ15N and the lowest contaminants occurrence. The area is an example of a complex volcanic media with several sources of contaminants such as leakages from septic tanks and sewerage, agriculture practices, irrigation with reclaimed water or urban runoff.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Reclaimed water Organic contaminants Heavy metals Groundwater |
| Subjects: | Q Science > QD Chemistry Q Science > QE Geology |
| Depositing User: | Users 649 not found. |
| Date Deposited: | 15 Feb 2016 15:58 |
| Last Modified: | 15 Feb 2016 15:58 |
| URI: | http://eprints.imdea-agua.org:13000/id/eprint/593 |
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