干旱区生态环境知识资源中心(Arid): Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt

Arid

DOI	10.3390/w16010022
	Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt
	Kasem, Alaa M.; Xu, Zhifang; Jiang, Hao; Liu, Wenjing; Zhang, Jiangyi; Nosair, Ahmed M.
通讯作者	Xu, ZF
来源期刊	WATER
EISSN	2073-4441
出版年	2024
卷号	16 期号:1
英文摘要	With the intensification of human activities, nitrate pollutants in groundwater are receiving increasing attention worldwide. Especially in the arid Nile Delta of Egypt, groundwater is one of the most valuable water resources in the region. Identifying the source of nitrate in groundwater with strong human disturbances is important to effective water resource management. This paper examined the stable isotopes (delta 15N/delta 18O-NO3 and delta 2H/delta 18O-H2O) and the hydrogeochemical parameters of the shallow groundwaters in the arid southeast of the Nile Delta to assess the potential sources and transformation processes of nitrate under severe urban and agricultural activities. The results revealed that the groundwaters were recharged by the Nile River. Meanwhile, the infiltration of irrigation water occurred in the west, while the mixing with the deep groundwater occurred in the east regions of the study area. The TDS, SO42-, NO3-, and Mn2+ concentrations of groundwaters (n = 55) exceeded the WHO permissible limit with 34.6%, 23.6%, 23.6%, and 65.5%, respectively. The NO3- concentrations in the shallow groundwaters ranged from 0.42 mg/L to 652 mg/L, and the higher levels were observed in the middle region of the study area where the unconfined condition prevailed. It extended to the deep groundwater and eastward of the study area in the groundwater flow direction. The delta 15N-NO3 and delta 18O-NO3 values suggested that the groundwater NO3- in the west and east regions of semi-confined condition were largely from the nitrification of soil organic nitrogen (SON) and chemical fertilizer (CF). In contrast, wastewater input (e.g., domestic sewage and unlined drains) and prevalent denitrification were identified in the middle region. The denitrification might be tightly coupled with the biogeochemical cycling of manganese. This study provides the first report on the groundwater NO3- dynamics in the Nile Delta, which generated valuable clues for effective water resource management in the arid region.
英文关键词	nitrate pollution dual nitrate isotopes water isotopes the Nile Delta
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001140693800001
WOS关键词	QUATERNARY AQUIFER ; ISOTOPIC ANALYSIS ; IDENTIFY SOURCES ; STABLE-ISOTOPES ; DUAL ISOTOPES ; WATER ; NITROGEN ; MANGANESE ; QUALITY ; CONTAMINATION
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405843
推荐引用方式 GB/T 7714	Kasem, Alaa M.,Xu, Zhifang,Jiang, Hao,et al. Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt[J],2024,16(1).
APA	Kasem, Alaa M.,Xu, Zhifang,Jiang, Hao,Liu, Wenjing,Zhang, Jiangyi,&Nosair, Ahmed M..(2024).Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt.WATER,16(1).
MLA	Kasem, Alaa M.,et al."Nitrate Source and Transformation in Groundwater under Urban and Agricultural Arid Environment in the Southeastern Nile Delta, Egypt".WATER 16.1(2024).