干旱区生态环境知识资源中心(Arid): Naturally Occurring Potentially Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality and Agriculture

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DOI	10.3390/geosciences10020062
	Naturally Occurring Potentially Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality and Agriculture
	Gevera, Patrick Kirita; Cave, Mark; Dowling, Kim; Gikuma-Njuru, Peter; Mouri, Hassina
通讯作者	Gevera, PK
来源期刊	GEOSCIENCES
EISSN	2076-3263
出版年	2020
卷号	10 期号:2
英文摘要	Makueni County is located in the semi-arid south-eastern Kenya region characterized by unreliable rainfall and limited surface water resources. This necessitates a high reliance on groundwater for domestic and agricultural use. In this paper, we report on the physico-chemical characteristics of 20 drinking water sources (boreholes, shallow wells, streams, and tap water) collected during the dry season (November 2018), the geochemical processes controlling their composition, and their suitability for drinking water and irrigation. Of all the physico-chemical parameters analysed, the concentrations of total dissolved solids, hardness, electrical conductivity, magnesium, calcium, chloride, and fluoride exceeded the permissible drinking water limits set by both the World Health Organization (WHO) and Kenya Bureau of Standards (KEBS) in up to 55% of the samples. The dominant ions reflect the high salinity in the water that ranged from very high to extreme in up to 50% of samples. The northern region shows the highest concentrations of the dominant parameters. The water type is predominantly Ca-Mg-HCO3 with a trend to Ca-Mg-Cl-SO4. Rock weathering and evaporation are suggested to be the primary controls of groundwater geochemical characteristics. High salinity and fluoride, which are associated with reported undesirable taste and gastrointestinal upsets, as well as cases of dental fluorosis are some of the effects of consuming groundwater in the region. These two parameters can be attributed to the weathering of biotite gneisses, granitoid gneisses, migmatites, and basaltic rocks that occur in the area. The high salinity and alkalinity of most of the samples analysed, renders the water unsuitable for irrigation in the study area.
英文关键词	groundwater quality potential harmful elements fluoride salinity irrigation
类型	Article
语种	英语
开放获取类型	DOAJ Gold, Green Accepted, Green Published
收录类别	ESCI
WOS记录号	WOS:000519623600025
WOS关键词	SALINITY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/334255
作者单位	[Gevera, Patrick Kirita; Mouri, Hassina] Univ Johannesburg, Dept Geol, ZA-2006 Johannesburg, South Africa; [Cave, Mark] British Geol Survey, Nottingham NG12 5GG, England; [Dowling, Kim] Federat Univ, Dept Geosci, Ballarat, Vic 3353, Australia; [Gikuma-Njuru, Peter] South Eastern Kenya Univ, Dept Environm Sci & Land Resources Management, Kitui POB 170-90200, Kwa Vonza, Kitui County, Kenya
推荐引用方式 GB/T 7714	Gevera, Patrick Kirita,Cave, Mark,Dowling, Kim,et al. Naturally Occurring Potentially Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality and Agriculture[J],2020,10(2).
APA	Gevera, Patrick Kirita,Cave, Mark,Dowling, Kim,Gikuma-Njuru, Peter,&Mouri, Hassina.(2020).Naturally Occurring Potentially Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality and Agriculture.GEOSCIENCES,10(2).
MLA	Gevera, Patrick Kirita,et al."Naturally Occurring Potentially Harmful Elements in Groundwater in Makueni County, South-Eastern Kenya: Effects on Drinking Water Quality and Agriculture".GEOSCIENCES 10.2(2020).