Research Article

Arsenic Contamination in Water from Selected Boreholes in Nairobi City County, Kenya

Alice S. Kiplangat
Kenyatta University, Kenya
Henry Mwangi
Kenyatta University, Kenya
Sauda Swaleh
Kenyatta University, Kenya
Wilson M. Njue
Kenyatta University, Kenya
* Corresponding author
DOI icon 10.24018/ejchem.2021.2.2.50

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Submitted 2021-02-18
Published 2021-03-16

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Article Main Content

Arsenic is a metalloid, which may be found in surface water, ground water, plants and rocks. In high concentrations, its compounds are considered to be genotoxic and carcinogenic. Its levels in drinking water must be regularly monitored and controlled. The objective of study was to determine the concentration of arsenic in water with reference to WHO limits from selected boreholes in Nairobi County, Kenya. Water was randomly sampled from a total of 63 boreholes in five zones (Central, Eastern, Northern, Western and Southern) during dry and wet season. The arsenic was analyzed by Hydride Generation Atomic Absorption Spectrometer (HG-AAS). The results showed that the arsenic content in borehole water during dry season ranged between 0.00455±0.0022 and 0.01007±0.006 and in the range of 0.002057±0.0008 - 0.00744±0.0051 mg/L during the wet season. There was significant difference (P˂0.05) in arsenic content in borehole water samples in Central zone compared to the other zones. During the dry season, arsenic content in water from ten boreholes (16%) and four boreholes (6%) during wet season was found to be above the WHO recommended limit of 0.01 mg/L. The calculated contamination factor for the borehole water ranged from slightly arsenic contaminated in Central zone to very slightly contaminated in the other zones during dry season. During the wet season, the borehole water in all the five zones were very slightly contaminated with arsenic. The pollution index showed that the boreholes in all the five zones during both wet and dry seasons were not polluted with arsenic. Steps should be taken to monitor and treat borehole water for domestic purposes in order to mitigate the effect on human health due to arsenic contamination.

Keywords: Arsenic, Borehole water, Contamination factor, Pollution index

References

  1. Nriagu JO, Bhattacharya P, Mukherjee AB, Bundschuh J, Zevenhoven R, Loeppert RH, et al. Arsenic in Soil and Groundwater Environment [Internet]. 2007. p. 3–60. Available from:https://www.elsevier.com/books/arsenic-in-soil-and-groundwater-environment/bhattacharya/978-0-444-51820-0.
     Google Scholar
  2. Smedley PL, Kinniburgh DG. A review of the source , behaviour and distribution of arsenic in natural waters. Appl Geochemistry. 2002;17(2002):517–68.
     Google Scholar
  3. International Agency for Research on Cancer. Some Drinking-water Disinfectaants and Contaminants, including Arsenic [Internet]. http://monographs.iarc.fr/ENG/Publications. @who.int; 2004 [cited 2019 Mar 31]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK402251/.
     Google Scholar
  4. WHO. Arsenic and Arsenic Compounds (Environmental Health Criteria) [Internet]. 2nd ed. Vol. 13. 2001. Available from: https://www.researchgate.net/publication/236154203_Arsenic_in_the_environment_-_An_overview_on_global_and_Sri_Lankan_context
     Google Scholar
  5. Jiang W, Hou Q, Yang Z, Zhong C, Zheng G, Yang Z, et al. Evaluation of potential effects of soil available phosphorus on soil arsenic availability and paddy rice inorganic arsenic content. Environ Pollution/ Sci Direct J. 2014;188:159–65.
     Google Scholar
  6. Zhu Y-G, Yoshinaga M, Zhao F-J, Rosen BP. Earth Abides Arsenic Biotransformations. Annu Rev Earth Planet Sci J. 2014;42(1):443–67.
     Google Scholar
  7. Ratnaike RN. Acute and chronic arsenic toxicity. Postgrad Med J. 2003;79:391–6.
     Google Scholar
  8. David SB, Hemond HF. Nitrate controls on iron and arsenic in an urban lake. Science (80- ). 2002;(296):2373–2376.
     Google Scholar
  9. George CM, Sima L, Helena M, Arias J, Mihalic J, Cabrera LZ, et al. Arsenic exposure in drinking water : an unrecognized health threat in Peru [Internet]. Vol. 92, Bull World Health Organ. 2014. p. 565–72. Available from:https://doi.org/http://dx.doi.org/10.2471/BLT.13.128496.
     Google Scholar
  10. Yunus F, Khan S, Chowdhury P, Milton AH. A Review of Groundwater Arsenic Contamination in Bangladesh : The Millennium Development Goal Era and Beyond. Int J Environ Res Public Health. 2016;13(2):215.
     Google Scholar
  11. Shibata T, Meng C, Umoren J, West H. Risk Assessment of Arsenic in Rice Cereal and Other Dietary Sources for Infants and Toddlers in the U.S. Int J Environ Res Public Heal. 2016;13(4):361.
     Google Scholar
  12. Sen G. Cooperation Between India and Bangladesh on Control of Arsenic Poisoning [Internet]. Institute for Defense studies and analyses. 2013 [cited 2019 Mar 24]. Available from: https://idsa.in/idsacomments/CooperationBetweenIndiaandBangladesh_GautamSen_270113.
     Google Scholar
  13. Mukherjee A, Das B, Rahman MM, Chakraborti D. Arsenic Contamination in Groundwater : A Global Perspective with Emphasis Arsenic Contamination in Groundwater : A Global Perspective with Emphasis on the Asian Scenario. J Heal Popul Nutr. 2006;24(2):142–63.
     Google Scholar
  14. Ahamed S, Sengupta MK, Mukherjee SC, Hossain MA, Das B, Nayak B, et al. An Eight-year Study Report on Arsenic Contamination in Groundwater and Health Effects in Eruani Village , Bangladesh and an Approach for Its Mitigation [Internet]. Vol. 24. 2006. Available from: www.bioline.org.br/pdf?hn06019.
     Google Scholar
  15. van Halem D, Bakker SA, Amy GL, Dijk JC Van. Arsenic in drinking water : a worldwide water quality concern for water supply companies. Drink Water Eng Sci J. 2009;2:29–34.
     Google Scholar
  16. Nwoke IB, Edori ES. Concentration of Heavy Metals in Borehole Water from Ikono. Int J Adv Res Chem Sci. 2020;7(1):27–33.
     Google Scholar
  17. Rahman A, Persson L-åke, Nermell B, Arifeen S El, Ekström C, Smith AH, et al. Exposure and Risk of Spontaneous Abortion , Stillbirth , and Infant Mortality. Epidemiology. 2010;21(6):797–804.
     Google Scholar
  18. Chen AY-Y, Olsen T. Chromated copper arsenate – treated wood : a potential source of arsenic exposure and toxicity in dermatology. Int J Women ’ s Dermatology. 2016;2(1):28–30.
     Google Scholar
  19. Chakrabarti D. Arsenic : Occurrence in Groundwater Arsenic : Occurrence in Groundwater ☆. In: Encyclopedia of Environmental Health [Internet]. 2nd ed. Elsevier Inc.; 2018. p. 1–16. Available from: http://dx.doi.org/10.1016/B978-0-12-409548-9.10634-7.
     Google Scholar
  20. WHO. Arsenic [Internet]. World Health Organization. 2018 [cited 2019 Apr 1]. Available from: https://www.who.int/news-room/fact-sheets/detail/arsenic.
     Google Scholar
  21. National Environment Management Authority (NEMA). Environmental Management And Co-Ordination (Water Quality) Regulations, 2006 [Internet]. Legal Notice number 120 Kenya: National Environment Management Authority (NEMA); 2006 p. 1–25. Available from: https://www.betacare.co.ke/.../Water Quality Regulations ken84962.pdf%0A.
     Google Scholar
  22. Kenya National Bureau of Statistics. 2019 Kenya Population and Housing Census – Vol. 1 [Internet]. 2019 [cited 2020 Oct 25]. p. 8. Available from: https://www.theelephant.info/documents/2019-kenya-population-and-housing-census-vol-1/.
     Google Scholar
  23. Thiongo J. Hope for Nairobi residents as Government drills bore holes. Standard Digital News [Internet]. 2017 Apr 5; Available from: https://www.standardmedia.co.ke/article/2001235135/hope-for-nairobi-residents-as-government-drills-bore-holes.
     Google Scholar
  24. US-EPA. National Primary Drinking Water Regulations; Arsenic and Clarifications to Compliance and New Source Contaminants Monitoring [Internet]. The Daily Journal of the United States Government. 2001. Available from: https://www.federalregister.gov/documents/2001/01/22/01-1668/national-primary-drinking-water-regulations-arsenic-and-clarifications-to-compliance-and-new-source.
     Google Scholar
  25. Makokha AO, Kinyanjui PK, Magoha HS, Mghweno LR, Nakajugo A, Wekesa JM. Arsenic Levels in the Environment and Foods Around Kisumu , Kenya. Open Enviromental Eng J. 2012;5:119–24.
     Google Scholar
  26. Weinber C. Arsenic and Drinking Water. LWW J. 2004;15(2):255.
     Google Scholar
  27. Open-Africa. Boreholes in Nairobi County [Internet]. 2015. Available from: https://africaopendata.org/dataset/66145814-0933-439b-9027-fa02b2636682/resource/99a950a7-ffb1-416d-a801-498e3f2d1d48/download/boreholes-in-nairobi-county-2015.xlsx
     Google Scholar
  28. Etyang FO, Muse GS. Concentrations of Selected Trace Elements and their Temporal Variation in Borehole Water, Eldoret Municipality, Kenya. Int J Environ Chem Ecotoxicol Res. 2016;1(2):1–10.
     Google Scholar
  29. Iqbal F, Raza N, Ali M, Athar M. Contamination of Kallar Kahar Lake by Inorganic Elements and Heavy Metals and their Temporal Variations. J Appl Sci Environ Manag. 2006;10(2):95–8.
     Google Scholar
  30. Al-Weher SM. Levels of heavy metal Cd, Cu, and Zn in three fish species collected from the Northern Jordan Valley, Jordan. Jordan J Biol Sci. 2008;1(1):41–6.
     Google Scholar
  31. Mugenda OM, Mugenda AG. Research Methods Quantative and Qualitative Approaches. 2003rd ed. Nairobi: Acts Press; 2003.
     Google Scholar
  32. Verma P, Singh KP, Tiwari AK, Sharma S, Purty P. Review of Various Contamination Index Approaches to Evaluate Groundwater Quality with Geographic Information System ( GIS ). Int J ChemTech Res. 2015;7(4):1920–9.
     Google Scholar
  33. Srinivas P, Kumar P, Srinivatas GN, Prasad A, Hemalatha T. Generation of Groundwater Quality Index Map- A case study. Civ Environ Res. 2011;1(2):9–21.
     Google Scholar
  34. Caliman AF, Robu MB, Smaranda C, Pavel L V, Gavrilescu M. Soil and groundwater cleanup: benefits and limits of emerging technologies. Clean Techn Environ Policy. 2011;13(2):241-268.
     Google Scholar
  35. Lacatusu R. Appraising levels of soil contamination and pollution with heavy metals. Eur Soil Bur Res. 2000;4:393–402.
     Google Scholar
  36. Muraguri PM. Assessment of Groundwater Quality in Nairobi County, Kenya. Jomo Kenyatta University of Agriculture and Technology; 2013.
     Google Scholar