Groundwater recharge by high-salinity lake water in a density-driven flow dominated system: an isotopic approach

Valiente, Nicolás; Sanz, David; Gómez-Alday, Juan José

doi:10.1051/e3sconf/20199812024

Cited by 2 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Groundwater from the 37.9 m deep piezometer has been monitored since April 2018, and physico-chemical data have been collected monthly. These data (as well as data collected from other points) have been used to characterize the hydrogeological characteristics of the lake, which have been published in previous studies [34][35][36]. Basically, between April 2018 and November 2019 the average values for physico-chemical parameters of groundwater collected from the 39.8 m deep piezometer were 7.45 ± 0.16 for pH, 16.57 ± 2.17 • C for temperature, 2.17 ± 1.00 mg/L for dissolved oxygen, and 23.22 ± 0.09% for oxygen saturation, 28.61 ± 38.85 mV for Eh, 2315.50 ± 172.02 µS/cm for EC, and 1436.44 ± 140.23 mg/L for TDS.…”

Section: Physico-chemical Parameters Of Deep Groundwatermentioning

confidence: 99%

Microbial Community and Atrazine-Degrading Genetic Potential in Deep Zones of a Hypersaline Lake-Aquifer System

et al. 2020

Self Cite

View full text Add to dashboard Cite

The chemical composition of groundwater and related surface water ecosystems can be modified by intensive agricultural activities. This is the case of the Natural Reserve of Pétrola saline lake (Albacete, SE Spain), which constitutes the discharge area of an unconfined aquifer. The extended use of fertilizers and pesticides poses a threat to ecosystem sustainability. One of the most applied herbicides worldwide has been atrazine. Despite being prohibited in Spain since 2007 by European regulations, atrazine can still be detected due to its high persistence in the environment. Atrazine degradation pathways are mediated by biological processes performed by microorganisms with adapted metabolic mechanisms that make in situ bioremediation possible. To evaluate the presence of such microorganisms in the unconfined aquifer, groundwater was collected from a flowing 37.9 m deep piezometer. DNA was extracted, and the bacterial 16S rRNA gene was amplified and cloned. Later, 93 clones were sequenced, providing the first molecular assessment of bacterial community structure in the deep zones of the aquifer. Some of these bacteria have been previously described to be involved in atrazine degradation. In addition, 14 bacteria were isolated from the groundwater samples and identified by 16S rRNA gene sequencing. DNA from these bacteria was subjected to PCR assays with primers designed for the genes involved in the atrazine degradation pathway. Positive results in the amplification were found in at least three of these bacteria (Arthrobacter sp., Nocardioides sp. and Pseudomonas sp.). The atrazine-degrading genetic potential was shown to be dependent on the trzN and atzA,B,C gene combination. These results suggest for the first time the adaptation of the bacterial population present in deep aquifer zones to atrazine exposure, even after more than 15 years of its ban in Spain. In addition, this study provides the baseline data about the bacterial communities found in deep aquifer zones from the hypersaline lake-aquifer system.

show abstract

Section: Physico-chemical Parameters Of Deep Groundwatermentioning

confidence: 99%