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DOI	10.1016/j.apgeochem.2020.104820
	Unraveling groundwater functioning and nitrate attenuation in evaporitic karst systems from southern Spain: An isotopic approach
	Valiente, Nicolas; Gil-Marquez, Jose Manuel; Gomez-Alday, Juan Jose; Andreo, Bartolome
通讯作者	Valiente, N (corresponding author), Univ Oslo, Sect Aquat Biol & Toxicol, Ctr Biogeochem Anthropocene, Dept Biosci, POB 1066, N-0316 Oslo, Norway.
来源期刊	APPLIED GEOCHEMISTRY
ISSN	0883-2927
EISSN	1872-9134
出版年	2020
卷号	123
英文摘要	High evaporation rates in semi-arid to arid regions result in an increase in salinity that can exacerbate the effect of pollutants in water bodies.This study examines how groundwater drives pollution removal in wetlands, wells and springs within the Chaotic Subbetic Complexes (southern Spain). This evaporitic system, localy with a clear karstic functioning, is characterized by groundwater with a wide range of mineralization. Hydrochemical and multi-isotopic (delta S-34, delta O-18, delta N-15, delta C-13 and delta H-2) techniques were used to understand the geochemical processes leading to pollutant attenuation within the complexes. There, regional groundwater evolve from recharge/transition areas, with low salinity, to the discharge zone. Mineralization of groundwater depends on the dissolution of evaporitic deposits (gypsum, halite) of Keuper age, which increases salinity of the water drained by the outlet springs. delta N-15 and delta O-18 values of dissolved nitrate (NO3-) were used to estimate the relative contribution of N sources. NO3- is mainly derived from agricultural inputs (nitrate and urea fertilizers). Long-residence groundwater plays an important role in the biogeochemical evolution. Denitrification is responsible for NO3- removal in transitional zones and discharge springs. This process is promoted by the oxidation of organic carbon, derived from recharge areas and further transported to deeper zones of the aquifer. The findings of this study provide a new understanding of how hydrogeological functioning is connected to pollutant removal in an evaporitic karst system, where the scale of groundwater flows plays a key role in biogeochemical processes.
英文关键词	Brine groundwater Stable isotopes Evaporitic karst aquifer Solute transport Nitrate attenuation
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000597174900004
WOS关键词	STABLE-ISOTOPES ; DISSOLVED SULFATE ; MICROBIAL DENITRIFICATION ; CHEMICAL CONVERSION ; BETIC CORDILLERA ; NITROUS-OXIDE ; WETLAND AREAS ; MURRAY BASIN ; FRESH-WATER ; DELTA-O-18
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348721
作者单位	[Valiente, Nicolas] Univ Oslo, Sect Aquat Biol & Toxicol, Ctr Biogeochem Anthropocene, Dept Biosci, POB 1066, N-0316 Oslo, Norway; [Valiente, Nicolas; Gomez-Alday, Juan Jose] Univ Castilla La Mancha UCLM, Inst Reg Dev IDR, Biotechnol & Nat Resources Sect, Campus Univ S-N, Albacete 02071, Spain; [Gil-Marquez, Jose Manuel; Andreo, Bartolome] Univ Malaga, Fac Sci, Dept Geol, Malaga 29071, Spain; [Gil-Marquez, Jose Manuel; Andreo, Bartolome] Univ Malaga, Fac Sci, Ctr Hydrogeol, Malaga 29071, Spain
推荐引用方式 GB/T 7714	Valiente, Nicolas,Gil-Marquez, Jose Manuel,Gomez-Alday, Juan Jose,et al. Unraveling groundwater functioning and nitrate attenuation in evaporitic karst systems from southern Spain: An isotopic approach[J],2020,123.
APA	Valiente, Nicolas,Gil-Marquez, Jose Manuel,Gomez-Alday, Juan Jose,&Andreo, Bartolome.(2020).Unraveling groundwater functioning and nitrate attenuation in evaporitic karst systems from southern Spain: An isotopic approach.APPLIED GEOCHEMISTRY,123.
MLA	Valiente, Nicolas,et al."Unraveling groundwater functioning and nitrate attenuation in evaporitic karst systems from southern Spain: An isotopic approach".APPLIED GEOCHEMISTRY 123(2020).