An Index Approach to Metallic Pollution in Groundwater Sources of South Region of Pemba Island
Science Journal of Analytical Chemistry
Volume 4, Issue 2, March 2016, Pages: 12-21
Received: Feb. 13, 2016; Accepted: Feb. 24, 2016; Published: Mar. 7, 2016
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Abdul A. J. Mohamed, Department of Natural Sciences, the State University of Zanzibar, Zanzibar, Tanzania
Ibrahim Abdul Rahman, Faculty of Science (FOS), Universiti Brunei Darussalam JalanTungku, Brunei Darussalam, Brunei
Lee H. Lim, Faculty of Science (FOS), Universiti Brunei Darussalam JalanTungku, Brunei Darussalam, Brunei
Sara A. Khamis, Department of Natural Sciences, the State University of Zanzibar, Zanzibar, Tanzania
Haji Mwevura, Department of Natural Sciences, the State University of Zanzibar, Zanzibar, Tanzania
Kombo H. Mbwana, Department of Natural Sciences, the State University of Zanzibar, Zanzibar, Tanzania
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The South Region of Pemba is one of the two Regions in Pemba Island. Residents within the region depend on groundwater as the main water source for the domestic and other social purposes. This study was conducted to assess the quality of drinking water in different areas of South region of Pemba. In order to evaluate the quality of groundwater in the study area, 17 groundwater samples were collected and analyzed for different physico-chemical parameters. In each water sample, four physicochemical parameters were analyzed, namely, electrical conductivity (EC), total dissolved solids (TDS), pH, and turbidity. For the case of metals, eleven metals, namely, Cd, Co, Cu, Cr (III), Li, Fe, Mg, Ni, Pb, Sr, and Zn were analyzed using standard procedures. The dataobtained were then compared with the available WHO and or USEPA drinking water standards. All the samples had EC and TDS within the recommended limits, while 53% and 29% of the samples had higher turbidity levels and lower pH, respectively than the WHO recommended guidelines. All the samples contained Co, Cu, Fe, Mg, Ni, Pb, and Zn within the maximum admissible limits. According to heavy metal pollution index (HPI), degree of contamination (Cd), and heavy metal evaluation index (HEI), only one area (Mgonanje-1) showed alarming risks. In most water samples, the ratio of concentrations of Li to Ni was greater than 1, while all Sr to Mg ratios were less than 1. Generally, the values of the analyzed physico-chemical parameters were within the recommended maximum admissible limits. However, the study recommends the stakeholders and other responsible authorities to take appropriate and corrective measures for the water sources located at the Mgonanje area.
Mgonanje, Alarming Risks, Li/Ni Ratio, Sr/Mg Ratio, HPI, HEI, Pemba Island
To cite this article
Abdul A. J. Mohamed, Ibrahim Abdul Rahman, Lee H. Lim, Sara A. Khamis, Haji Mwevura, Kombo H. Mbwana, An Index Approach to Metallic Pollution in Groundwater Sources of South Region of Pemba Island, Science Journal of Analytical Chemistry. Vol. 4, No. 2, 2016, pp. 12-21. doi: 10.11648/j.sjac.20160402.11
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Humphreys WF (2009) Hydrogeology and groundwater ecology: Does each inform the other? Hydrogeol. J. 17: 5–21.
Steube C, Richter S, Griebler, C (2009) First attempts towards an integrative concept for the ecological assessment of groundwater ecosystems. Hydrogeol, J. 17: 23–35.
Prapat P, Benchamaporn S, Tanisa W, Sathaporn P (2013) Cancer Risk Assessment from Trihalomethanes in Community Water Supply at Northeastern Thailand, Int. J. Envi. Sci. Development, 4: 535-544.
Agbaire PO, Oyibo IP (2009) Seasonal variation of some physico- chemical properties of borehole water in Abraka, Nigeria. Afr. J. Pure Appl. Chem., 3: 116-118.
Srinivasamoorthy K, Nanthakumar C, Vasanthavigar M., Vijayaraghavan K, Rajivgandhi, R., et al. (2009) Groundwater quality assessment from a hard rock terrain, Salem district of Tamilnadu, India, Arabian J. Geosci., DOI=10.1007/s12517-0-09-0076-7.
WHO (2003) Quantifying selected major risks to health, The World Health Report 2002, World Health Organization, Geneva.
Suthar S, Chhimpa V, Singh S (2008) Bacterial contamination in drinking water: a case study in rural areas of northern Rajasthan, India. Environ Monit Asses, DOI 10.1007/s10661-008-0611-0.
Phansalkar S J, Kher V, Deshpande P (2005) Expanding Rings of Dryness: Water Imports from Hinterlands to Cities and the Rising Demands of Mega-Cities, in IWMI-Tata Annual Partner’s Meet, Anand.
Mohamed AAJ, Abdul Rahman I, Lim LH (2014a) Groundwater quality assessment in the urban-west region of Zanzibar Island, EnvironMonit Assess., 186: 6287–6300.
Mohamed AAJ, Abdul Rahman I, Said SA, Lim LH (2014b) Occurrence of Arsenic, Lead, Thallium and Beryllium in Groundwater, American J. Env. Sci., 10: 164-170.
Helios-Rybicka E, Adamiec E, Aleksander-Kwaterczak U (2005) Distribution of trace metals in the Odra River system: Water–suspended matter–sediments, Limnologica, 35: 185–189.
Sarala C, Ravi BP (2012) Assessment of Groundwater Quality Parameters in and around Jawaharnagar Hyderabad, Int. J. Sci., 2: 1-6.
Milenkovic N, Damjanovic M, Ristic M (2005) Study of heavy metal pollution in sediments from the Iron Gate (Danuae River), Serbia and Montenegro. Polish J. Env. Study, 14: 781-787.
Bellinger DC (2008) Very low lead exposures and children’s neurodevelopment. Current opinion in pediatrics, 20: 172-177.
Perronnet K, Schwartz C, Gerard E, Morel JL, (2000) Availability of cadmium and zinc accumulated in the leaves of Thlaspicaerulescens incorporated into soil. Plant Soil, 227: 257-263.
RajappaB, Manjappa S, Puttaiah ET (2010) Monitoring of heavy metal concentration in groundwater of Hakinaka Taluk, India. Contemporary Eng. Sci., 3: 183-190.
Nriagu JO (1988) A silent epidemic of environmental metal poisoning? Envir. Pollution, 50: 139-161.
Tuzen M, Soylak M (2006) Evaluation of metal levels of drinking waters from the Tokat-black sea region of Turkey, Polish J. Env. Study, 15: 915-919.
Thomas KB, FrancisO, SamuelOA, Osei A (2015) Pollution evaluation, sources and risk assessment of heavy metals in hand‑dug wells from Ejisu‑Juaben Municipality, Ghana Environ Syst. Res. 4: 18.
Prasad B, Bose JM (2001) Evaluation of heavy metal pollution index for surface and spring water near a limestone mining area of the lower Himalayas, Envir. Geology, 41: 183–188.
Backman B, Bodis D, Lahermo P, Rapant S (1997) Application of a groundwater contamination index in Finland and Slovakia. Envir. Geology, 36: 55–64.
Rubio B, Nombela MA, Vilas F ( 2000) Geochemistry of Major and Trace Elements in Sediments of the Ria de Vigo (NW Spain): an Assessment of Metal Pollution. Marine Pollution Bulletin, 40: 968-980.
Edet AE, Offiong OE (2002) Evaluation of water quality pollution indices for heavy metal contamination monitoring. A study case from Akpabuyo - Odukpani area, Lower Cross River Basin, (southeastern Nigeria), Geo J. 57: 295–304.
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