Contamination Levels, Source Apportionments, and Health Risks Evaluation of Heavy Metals from the Surface Water of the Riruwai Mining Area, North-Western Nigeria

Abdu, N., Abdulkadir, A., Agbenin, J.O. & Buerkert, A.  (2011). Vertical distribution of heavy metals in waste-irrigated vegetable garden soil of three West African cities.  Nutr. Cycling Agroecosysts, 89(3); 387-397. https://doi.org/10.1007/s10705-010-9403-3
Abdullahi, M.A. (2017). Assessment of radiological hazards around Ruriwai tin mines, Kano State, North Western Nigeria. A PhD thesis, Department of Physics Faculty of Physical Sciences, Ahmadu Bello University, Zaria, Nigeria.
Adeniyi, A.G. & Ighalo, J.O. (2019). Biosorption of pollutants by plant leaves: an empirical review. J. Environ. Chem. Eng., 7 (3); 103100. https://doi.org/10.1016/j.jece.2019.103100
Ahmad, B.B., Tsafe, A. I., Uba, S. & Aliyu, S. (2016). Analysis of Heavy Metals in Water around Gidan Saru Mining Site, Zamfara State, Nigeria. Int. J. Sci. Glob. Sustain., 2(3); 31-39. https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/232
Ahmed, A. S., Hossain, M. B., Babu, S. O. F., Rahman, M. M. & Sarker, M. S. I. (2021). Human health risk assessment of heavy metals in water from the subtropical river, Gomti, Bangladesh. Environ. Nanotechnol. Monit. Manag., 15; 100416. https://doi.org/10.1016/j.enmm.2020.100416.
Ajala, O. J., Ighalo, J. O., Adeniyi, A. G., Ogunniyi, S. & Adeyanju, C. A. (2020). Contamination issues in sachet & bottled water in Nigeria: a mini-review. Sustain. Water Resour. Manag., 6(6); 112. https://doi.org/10.1007/s40899-020-00478-5
Akoglu, H. (2018). User’s guide to correlation coefficients. Turk. J. Emerg. Med., 18(3), 91–93.  https://doi.org/10.1016/j.tjem.2018.08.001
Alhaji, M., Adamu, S. & Buba, L.F. (2017). Assessment of summer heat stress condition for tourism development in Riruwai ring complex, Doguwa Local Government, Kano State.  Dutse J. Pure Appl. Sci., 3(2); 288-299.
Alidadi, H., Tavakoly Sany, S. B., Zarif Garaati Oftadeh, B., Mohamad, T., Shamszade, H. & Fakhari, M. (2019). Health risk assessments of arsenic & toxic heavy metal exposure in drinking water in Northeast Iran. Environ. Health Prev. Med., 24(1); 59. https://doi.org/10.1186/s12199-019-0812-x
American Public Health Association (APHA, 1998).  Standard Methods for the Examination of Water & Wastewater (21st ed). APHA-AWWA-WEF, Washington, D. C, U.S.A
Arulbalaji, P., Padmalal, D. & Sreelash, K. (2019). GIS & AHP Techniques Based Delineation of Groundwater Potential Zones: a case study from Southern Western Ghats, India. Sci. Rep., 9(1); 2082. https://doi.org/10.1038/s41598-019-38567-x
Astuti, R., Mallongi, A., Amiruddin, R., Hatta, M. & Rauf, A. U. (2021). Risk identification of heavy metals in well water surrounds watershed area of Pangkajene, Indonesia. Gaceta sanitaria, 35 Suppl 1, S33–S37. https://doi.org/10.1016/j.gaceta.2020.12.010
Ayub, A. & Ahmad, S.S. (2020). Seasonal assessment of groundwater contamination in coal mining areas of Balochistan. Sustainability., 12(17); 6889. https://doi.org/10.3390/su12176889
Badamasi, H., Hassan, U. F., Adamu, H. M. & Baba, N. M. (2021). Evaluation of Heavy Metals Pollution Status of the Groundwater around Riruwai Mining Area, Kano State, Nigeria. European J. Environ. Earth Sci., 2(3); 23–28. https://doi.org/10.24018/ejgeo.2021.2.3.140
Baeten, J., Langston, N. & Lafreniere, D. (2018). A spatial evaluation of historic iron mining impacts on current impaired waters in Lake Superior’s Mesabi Range. Ambio, 47(2); 231–244. https://doi.org/10.1007/s13280-017-0948-0
Begum, A. & Harikrishnarai (2008). Study on the quality of water in some streams of Cauvery River. J. Chem., 5; 377-384. https://doi.org/10.1155/2008/234563
Biswas, P. K., Uddin, N., Alam, S., -Us-Sakib, T., Sultana, S. & Ahmed, T. (2017). Evaluation of heavy metal pollution indices in irrigation & drinking water systems of Barapukuria Coal mine area, Bangladesh. Am. J. Water Resour., 5(5); 146-151. https://doi.org/10.12691/AJWR-5-5-2
Bondu, R., Cloutier, V., Rosa, E. & Roy, M. (2020). An exploratory data analysis approach for assessing the sources & distribution of naturally occurring contaminants (F, Ba, Mn, As) in groundwater from southern Quebec (Canada). Appl. Geochem., 114, 104500. https://doi.org/10.1016/j.apgeochem.2019.104500
Boruvka,  L., Vacek, O. & Jehlicka, J. (2005). Principal component analysis as a tool to indicate the origin of potentially toxic elements in soils. Geoderma, 128; 289–300. http://dx.doi.org/10.1016/j.geoderma.2005.04.010
Chon, H., Lee, J. & Lee, J. (2011). Heavy metal contamination of soils, its risk assessment & bioremediation. Geosystem Eng., 14 (4); 191-206. https://doi.org/10.1080/12269328.2011.10541350
Chowdhury, S., Mazumder, M., Al-Attas, O. & Husain, T. (2016). Heavy metals in drinking water: Occurrences, implications, & future needs in developing countries. Sci. Total Environ., 569-570; 476–488. https://doi.org/10.1016/j.scitotenv.2016.06.166
Dahmouni, M., Hoermann, G., Jouzdan, O. & Hachicha, M. (2019). Spatio−temporal variability of hydrochemical parameters & heavy metals in shallow groundwater of the area of Cebala−Borj−Touil, irrigated with treated wastewater (Tunisia). Environ. Earth Sci., 78; 57.  https://doi.org/10.1007/s12665-019-8056-z
Dey, M., Akter, A., Islam, S., Chandra Dey, S., Choudhury, T. R., Fatema, K. J. & Begum, B. A. (2021). Assessment of contamination level, pollution risk & source apportionment of heavy metals in the Halda River water, Bangladesh. Heliyon, 7(12); e08625. https://doi.org/10.1186/s41043-016-0041-5
Dhakate, R., Singh, V. S. & Hodlur, G. K. (2008). Impact assessment of chromite mining on groundwater through simulation modeling study in Sukinda chromite mining area, Orissa, India. J. Hazard. Mater., 160(2-3), 535–547. https://doi.org/10.1016/j.jhazmat.2008.03.053
Duncan, A. E.,  De Vries,. N. & Nyarko, K.B. (2018). Assessment of heavy metal pollution in the main pra river & its tributaries  in the pra basin of Ghana. Environ. Nanotechnol. Monit. Manag., 10; 264–271. https://doi.org/10.1016/j.enmm.2018.06.003
Duncan, A.E. (2020). The Dangerous Couple: Illegal mining & water pollution—a case study in Fena river in the Ashanti region of Ghana. J. Chem., 2020, 2378560. https://doi.org/10.1155/2020/2378560
Egbueri, J. C., Ukah, B. U., Ubido, O. E. & Unigwe, C. O. (2020). A chemometric approach to source apportionment, ecological & health risk assessment of heavy metals in industrial soils from Southwestern Nigeria. Int. J. Environ. Anal. Chem., 102; 14, 3399-3417. https://doi.org/10.1080/03067319.2020.1769615
Eletta, O. (2012). Water Quality Monitoring & Assessment in a Developing Country. In K. Voudouris, & D. Voutsa (Eds.), Water Quality Monitoring & Assessment. IntechOpen. https://doi.org/10.5772/32976s
Elhadi, R. E., Abdullah, A. M., Abdullah, A. H., Hanan Ash’aari, Z., Kura, N. U. & Adamu, A. (2017). Source Identification of Heavy Metals in Particulate Matter (PM10) in a Malaysian Traffic Area Using Multivariate Techniques. Pol. J. Environ. Stud., 26(6); 2523-2532. https://doi.org/10.15244/pjoes/69941
Ewusi, A., Sunkari, E.D., Seidu, J. & Coffie-Anum, E. (2022). Hydrogeochemical characteristics, sources & human health risk assessment of heavy metal dispersion in the mine pit water–surface water–groundwater system in the largest manganese mine in Ghana. Environ. Technol. Innov., 26; 102312. https://doi.org/10.1016/j.eti.2022.102312
Fan, S. & Wang, X. (2017). Analysis & assessment of heavy metals pollution in soils around a Pb & Zn smelter in Baoji City, Northwest China.  Hum. Ecol. Risk Assess., 23(5); 1099-1120. https://doi.org/10.1080/10807039.2017.1300857
Fashola, M. O., Ngole-Jeme, V. M. & Babalola, O. O. (2016). Heavy Metal Pollution from Gold Mines: Environmental Effects & Bacterial Strategies for Resistance. Int. J. Environ. Res. Public health, 13(11); 1047. https://doi.org/10.3390/ijerph13111047
Florescu, D., Ionete, R.E., S&ru, C., Iordache, A. & Culea, M. (2011). The influence of pollution monitoring parameters in characterizing the surface water quality from Romania southern area, Rom. J. Phys., 56; 1001–1010.
Gao, S., Wang, Z., Wu, Q. & Zeng J. (2020). Multivariate statistical evaluation of dissolved heavy metals & a water quality assessment in the Lake Aha watershed, Southwest China.  Peer J, 8; e9660. http://dx.doi.org/10.7717/peerj.9660
Ghahramani, E., Maleki, A., Kamarehie, B., Rezaiee, R., Darvisheavy metalotevalli, M. & Azim F, et al.(2020). Determination of heavy  metals concentration in drinking water of rural areas of Divandarreh  county, Kurdistan province: Carcinogenic & non-carcinogenic health  risk assessment. Int. J. Environ. Health Eng., 9(14); 1-19.  https://doi.org/10.4103/ijehe.ijehe_15_19
Giri, S. & Singh, A. K. (2015). Human health risk assessment via drinking water pathway due to metal contamination in the groundwater of Subarnarekha River Basin, India. Environ. Monit. Assess., 187(3); 63. https://doi.org/10.1007/s10661-015-4265-4
Guo, G., Wu, F., Xie, F. & Zhang, R. (2012). Spatial distribution & pollution assessment of heavy metals in urban soils from southwest China. J. Environ. Sci. (China), 24(3); 410-418. https://doi.org/10.1016/S1001-0742(11)60762-6
Hadzi, G. Y., Essumang, D. K. & Adjei, J. K. (2015). Distribution & Risk Assessment of Heavy Metals in Surface Water from Pristine Environments & Major Mining Areas in Ghana. Journal Health Pollut., 5(9); 86–99. https://doi.org/10.5696/2156-9614-5-9.86.
Hasan, M.R., Khan, M.Z.H., Khan, M., Aktar, S., Raheavy metalan, M., Hossain, F. & Hasan, A.S.M.M. (2016) Heavy metals distribution & contamination in surface water of the Bay of Bengal Coast. Cogent Environ. Sci., 2(1); 1140001. https://doi.org/10.1080/23311843.2016.1140001
He, L., Gao, B., Luo, X., Jiao, J., Qin, H., Zhang, C. & Dong, Y. (2018). Health risk assessment of heavy metals in surface water near a uranium tailing pond in Jiangxi province, South China. Sustainability., 10(4); 1113. https://doi.org/10.3390/su10041113
Hu, G., Bakhtavar, E., Hewage, K., Mohseni, M. & Sadiq, R. (2019). Heavy metals risk assessment in drinking water: An integrated probabilistic-fuzzy approach. J. Environ. Mang., 250, 109514. https://doi.org/10.1016/j.jenvman.2019.109514
Hussain, R., Wei, C. & Luo, K. (2019). Hydrogeochemical characteristics, source identification & health risks of groundwater & surface water in mining & non‑mining areas of Handan, China. Environ. Earth Sci., 78, 402. https://doi.org/10.1007/s12665-019-8350-9
Ighalo, J. O. & Adeniyi, A. G. (2020). A comprehensive review of water quality monitoring & assessment in Nigeria. Chemosphere, 260; 127569. https://doi.org/10.1016/j.chemosphere.2020.127569
Irzon, R., Syafri, I., Hutabarat, J., Sendjaja, P. & Permanadewi, S. (2018).  Heavy metals contents & pollution in tin tailings from Sinkep Island, Riau, Indonesia. Sains Malaysiana, 47(11); 2609-2616. http://dx.doi.org/10.17576/jsm-2018-4711-03
Ismaila, A., Aliyu, A.S. & Ibrahim, Y.V. (2022). Evaluation of Gamma Radiation Dose Level in Mining Sites of Riruwai, Kano, Nigeria. Commun. Physic. Sci., 8(1); 101-108.
Jiang, Y., Chao, S., Liu, J., Yang, Y., Chen, Y., Zhang, A. & Cao, H. (2017). Source apportionment & health risk assessment of heavy metals in soil for a township in Jiangsu Province, China. Chemosphere, 168; 1658–1668. https://doi.org/10.1016/j.chemosphere.2016.11.088.
Karim, Z. (2011). Risk assessment of dissolved trace metals in drinking water of Karachi, Pakistan. Bull. Environ. Contam. Toxicol., 86; 676–678. https://doi.org/10.1007/s00128-011-0261-8
Kenneth, O.C., Kalu, A.U. & Francis, A. (2017). Environmental impacts of mineral exploration in Nigeria & their phytoremediation strategies for sustainable ecosystem. Glob. J. Sci. Front. Res., 17(3); 19-28
Khan, R., Saxena, A. & Shukla, S. (2020). Evaluation of heavy metal pollution for River Gomti, in parts of Ganga Alluvial Plain, India. SN Appl. Sci., 2(8), 1451. https://doi.org/10.1007/s42452-020-03233-9
Khanorangaa, M. & Khalid, S. (2019). An assessment of groundwater quality for irrigation & drinking purposes around brick kilns in three districts of Balochistan province. Pakistan J. Geochem. Explor., 197; 14–26. https://doi.org/10.1016/j.gexplo.2018.11.007
Khelfaoui, M., Benaissa, A., Kherraf, S., Madjram, M. S., Bouras, I. & Mehri, K. (2022). Assessment of groundwater & surface water pollution by hazardous metals, using multivariate analysis & metal pollution index around the old Sidi Kamber mine, NE Algeria. Pollution, 8(3); 889-903. https://doi.org/10.22059/poll.2022.335695.1294
Kumar, V., Parihar, R. D., Sharma, A., Bakshi, P., Singh Sidhu, G. P. & Bali, A. S. (2019). Global evaluation of heavy metal content in surface water bodies: A meta-analysis using heavy metal pollution indices & multivariate statistical analyses. Chemosphere, 236; 124364. https://doi.org/10.1016/j.chemosphere.2019.124364
Lambu, I.B. (2019). ‘Forgetting to Remember’: The fate of riruwai old tin mining communities in Kano state Nigeria. Afr. J. Earth Environ. Sci., 1(2); 265–280. http://dx.doi.org/10.11113/ajees.v3.n1.103
Li, Z., Ma, Z., Vander Kuijp, T.J., Youn, Z. & Huang, L. (2014). A Review of soil heavy metal pollution from mines in China: pollution & health risk assessment. Sci. Total Environ., 469; 843-853. https://doi.org/10.1016/j.scitotenv.2013.08.090
Lu, Y., Khan, H., Zakir, S., Ihsanullah, Khan, S., Khan, A. A., Wei, L. & Wang, T. (2013). Health risks associated with heavy metals in the drinking water of Swat, Northern Pakistan. J. Environ. Sci. (China), 25(10), 2003–2013. https://doi.org/10.1016/s1001-0742(12)60275-7
Luo, P., Xu, C., Kang, S., Huo, A., Lyu, J., Zhou, M. & Nover, D. (2021). Heavy metals in water & surface sediments of the Fenghe River Basin, China: assessment & source analysis. Water Sci. Technol., 84(10-11);3072–3090. https://doi.org/10.2166/wst.2021.335
Ma, Y., Egodawatta, P., McGree, J., Liu, A. & Goonetilleke, A. (2016). Human health risk assessment of heavy metals in urban stormwater.  Sci. Total Environ., 557-558; 764–772. https://doi.org/10.1016/j.scitotenv.2016.03.067
Martin, R.F. & Bowden, P. (1981). Peraluminous granites produced by rock fluid interaction in the riruwai nonorogenic ring-complex, nigeria: mineological evidence. Canad. Minerol., 19(1); 65-81.
Meng, Z., Bai, X. & Tang, X. (2022). Short−Term assessment of heavy metals in surface water from Xiaohe River irrigation area, china: levels, sources & distribution. Water, 14(8); 1273. http://dx.doi.org/10.3390/w14081273
Mohan, S.V., Nithila, P. & Reddy, S.J. (1996) Estimation of heavy metal in drinking water & development of Heavy Metal Pollution Index. J. Environ. Sci. Health, A-31; 283-289. https://doi.org/10.1080/10934529609376357
Mollo, V.M., Nomngongo, P.N. & Ramontja, J. (2022). Evaluation of surface water quality using various indices for heavy metals in Sasolburg, South Africa. Water, 14; 2375. https://doi.org/10.3390/w14152375
Muhammad, S., Shah, M.T. & Khan, S. (2011). Health risk assessment of heavy metals & their source apportionment in drinking water of Kohistan region, Northern Pakistan. Microchem. J., 98; 334–343. https://doi.org/10.1016/j.microc.2011.03.003
Nafeesa Baby T.P., Vineethkumar, V., Shimod, K.P., Vishnu, C.V. & Jayadevan, S. (2022). Heavy metal contamination in water sources of Thaliparamba municipality, Kerala, India. Radiat. Prot. Environ., 45; 54-61.  https://doi.org/10.4103/rpe.rpe_25_21
Naz, A., Mishra, B.K. & Gupta, S.K. (2016). Human health risk assessment of chromium in drinking water: a case study of Sukinda chromite mine, Odisha, India. Expos. Health, 8(2); 253-264. https://doi.org/10.1007/s12403-016-0199-5
Nigerian Standard for Drinking Water Quality (NSDWQ, 2007). “Nigerian Standard for Drinking Water Quality”. Nigerian Industrial Standard NIS 554, Standard Organization of Nigeria.
Nkansah, M. A., Boadi, N. O. & Badu, M. (2010). Assessment of the quality of water from hand-dug wells in Ghana. Environ. Health Insig., 4; 7–12. https://doi.org/10.4137/ehi.s3149.
Olasehinde, A., Ashano, E.C. & Singh, G.P. (2012). Analysis of magnetic anomaly over the Riruwai younger granite ring complex: a geodynamic implication. Cont. J. Earth Sci., 7(1); 9-18. 
Pan, C., Yu, F., Tao, X., Guo, J. & Yu, Y. (2020). Contamination, spatial distribution & source analysis of heavy metals in surface soil of Anhui Chaohu economic development zone, China. Sustainability, 12 (8117); 1-15. http://dx.doi.org/10.3390/su12198117
Panaskar, D.B., Wagh, V.M., Muley, A.A., Mukate, S.V., Pawar, R.S. andAamalawar, M.L. (2016). Evaluating groundwater suitability for the domestic, irrigation, & industrial purposes in N&ed Tehsil, Maharasgtra, India, using GIS & statistics. Arab. J. Geosci., 9; 615. https://doi.org/10.1007/s12517-016-2641-1
Piroozfar, P., Alipour, S., Modabberi, S. & Cohen, D. (2021). Using multivariate statistical analysis in assessment of surface water quality & identification of heavy metal pollution sources in Sarough watershed, NW of Iran. Environ. Monit. Assess., 193(9); 564. https://doi.org/10.1007/s10661-021-09363-w
Prasad, B., Soni, A. K., Vishwakarma, A., Trivedi, R. & Singh, K. K. K. (2020). Evaluation of water quality near the Malanjhkhand copper mines, India, by use of multivariate analysis & a metal pollution index. Environ Earth Sci., 79; 259. https://doi.org/10.1007/s12665-020-09002-6
Rajappa, B., Manjappa, S. & Puttaiah, E.T. (2010). Monitoring of heavy metal concentration in surface water of Hakinaka Taluk, India.  Contem. Eng. Sci., 3; 183-190.
Rakotondrabe, F., Ndam Ngoupayou, J. R., Mfonka, Z., Rasolomanana, E. H., Nyangono Abolo, A. J. & Ako Ako, A. (2018). Water quality assessment in the Bétaré-Oya gold mining area (East-Cameroon): Multivariate Statistical Analysis approach. Sci. Total Environ., 610-611; 831–844. https://doi.org/10.1016/j.scitotenv.2017.08.080
Reis, M. M., Tuffi Santos, L. D., da Silva, A. J., de Pinho, G. P. & Montes, W. G. (2019). Metal contamination of water & sediments of the Vieira River, Montes Claros, Brazil. Arch. Environ. Contam. Toxicol., 77(4); 527–536. https://doi.org/10.1007/s00244-019-00666-1
Rezaei, H., Zarei, A., Kamarehie, B., Jafari, A., Fakhri, Y. & Bidarpoor, F. (2019).  Levels, distributions & health risk assessment of lead, cadmium & arsenic found in drinking groundwater of Dehgolan’s villages, Iran. Toxicol. Environ. Health Sci., 11, 54-62. https://doi.org/10.1007/s13530-019-0388-2
Rima, S.A., Saha, S.K., Saima, J., Hossain, M.S., Tanni, T.N. & Bakar, M.A. (2022). Pollution evaluation & health risk assessment of heavy metals in the surface water of a remote island Nijhum Dweep, northern Bay of Bengal. Environ. Nanotechnol. Monit. Manag., 18; 100706. https://doi.org/10.1016/j.enmm.2022.100706
Santana, C. S., Montalván Olivares, D. M., Silva, V., Luzardo, F., Velasco, F. G. & de Jesus, R. M. (2020). Assessment of water resources pollution associated with mining activity in a semi-arid region. J. Environ. Mang., 273; 111148. https://doi.org/10.1016/j.jenvman.2020.111148
Selvam, S., Jesuraja, K., Roy, P. D., Venkatramanan, S., Khan, R., Shukla, S., Manimaran, D. & Muthukumar, P. (2022). Human health risk assessment of heavy metal & pathogenic contamination in surface water of the Punnakayal estuary, South India. Chemosphere, 298; 134027. https://doi.org/10.1016/j.chemosphere.2022.134027
Sheykhi, V. & Moore, F. (2012). Geochemical characterization of Kor River water quality, Fars Province, Southwest Iran. Water Qual. Expo. Health, 4; 25–38. https://doi.org/10.1007/s12403-012-0063-1
Silas, I.I., Wuana, R. & Augustine, A. U. (2018). Seasonal variation in water quality parameters of river Mkomon Kwande local government area, Nigeria. Int. J. Rec. Res. Phys. Chem. Sci., 5(1); 42-62.
Singh, P.K., Verma, P., Tiwari, A.K., Sharma, S. & Purty, P. (2015). Review of various contamination index approaches to evaluate groundwater quality with geographic information system (GIS). Int. J. ChemTech Res., 7(4); 1920–1929.
Sobhanardakani, S., Taghavi, L., Shaheavy metaloradi, B. & Jahangard, A. (2017). Groundwater quality assessment using the water quality pollution indices in Toyserkan Plain. Environ. Health Eng. Manag. J., 4(1); 21–27.
Su, K., Wang, Q., Li, L., Cao, R., Xi, Y. & Li, G. (2022). Water quality assessment based on Nemerow pollution index method: A case study of Heilongtan reservoir in central Sichuan province, China. PloS one, 17(8); e0273305. https://doi.org/10.1371/journal.pone.0273305
Sultana, M.S., Rana, S., Yamazaki, S., Aono, T. & Yoshida, S. (2017).  Health risk assessment for carcinogenic & non-carcinogenic heavy metal exposures from vegetables & fruits of Bangladesh, Cogent Environ. Sci., 3(1); 1-17. https://doi.org/10.1080/23311843.2017.1291107
Sur, I.M., Moldovan, A., Micle, V. & Polyak, E.T. (2022). Assessment of surface water quality in the Baia Mare area, Romania. Water, 14(9); 3118. https://doi.org/10.3390/w14193118
Tay, C.K., Dorleku, M. & Doamekpor, L.K. (2019). Human exposure risks assessment of heavy metals in groundwater within the Amansie & Adansi districts in Ghana using pollution evaluation indices. West Afr. J. Appl. Ecol., 27(1); 23-41.
Tolche, A.D. (2021). Groundwater potential mapping using geospatial techniques: a case study of Dhungeta-Ramis sub-basin, Ethiopia.  Geol. Ecol. Landsc., 5(1); 65-80. https://doi.org/10.1080/24749508.2020.1728882
United States Agency for Toxic Substances & Diseases Registry (USATSDR, 1999). Lead Toxicological Profiles. Atlanta. Centers for Diseases Control & Prevention PB/99/166704.
United States Environmental Protection Agency (USEPA, 1989). Risk Assessment Guidance for Superfund (Volume I) Human Health Evaluation Manual (Part A). Office of Solid Waste & Emergency Response, US Environmental Protection Agency, Washington, D.C, USA. pp. 1–89.
United States Environmental Protection Agency (USEPA, 2004). Risk Assessment Guidance for Superfund Volume I: Human Health Evaluation Manual (Part E, Supplemental Guidance for Dermal Risk Assessment). Office of Superfund Remediation & Technology Innovation, US Environmental Protection Agency, Washington DC, USA.  pp. 5-7.
United States Environmental Protection Agency (USEPA, 2011). Exposure Factors Handbook 2011 Edition’ (Final Report). Washington, DC: US Environmental Protection Agency, EPA/600/R‑09/052F; 2011.
Uugwanga, M.N. & Kgabi, N.A. (2021). Heavy metal pollution index of surface & groundwater from around an abandoned mine site, Klein Aub. Phys. Chem. Earth, Parts A/B/C, 124; 103067. http://dx.doi.org/10.1016/j.pce.2021.103067
Varol, S. & Şekerci, M. (2018). Hydrogeochemistry, water quality & health risk assessment of water resources contaminated by agricultural activities in Korkuteli (Antalya, Turkey) district center. J. Water Health, 16(4); 574–599. https://doi.org/10.2166/wh.2018.003
Wang, J., Liu, G., Liu, H. & Lam, P. (2017). Multivariate statistical evaluation of dissolved trace elements & a water quality assessment in the middle reaches of Huaihe River, Anhui, China. Sci. Total Environ., 583; 421–431. https://doi.org/10.1016/j.scitotenv.2017.01.088
Wang, X., Sun, Y., Li, S. & Wang, H. (2019). Spatial distribution & ecological risk assessment of heavy metals in soil from the Raoyanghe Wetland, China. PLoS ONE, 14(8);  e0220409. https://doi.org/10.1371/journal.pone.0220409
Wongsasuluk, P., Chotpantarat, S., Siriwong, W. & Robson, M. (2014). Heavy metal contamination & human health risk assessment in drinking water from shallow groundwater wells in an agricultural area in Ubon Ratchathani province, Thailand. Environ. Geochem. Health, 36(1); 169–182. https://doi.org/10.1007/s10653-013-9537-8
World Health Organization (WHO, 2011). Guidelines for drinking-water quality. World health organization, 216, 303-304.
Wu, B., Zhao, D. Y., Jia, H. Y., Zhang, Y., Zhang, X. X. & Cheng, S. P. (2009). Preliminary risk assessment of trace metal pollution in surface water from Yangtze River in Nanjing Section, China. Bull. Environ. Contam. Toxicol., 82(4); 405–409. https://doi.org/10.1007/s00128-008-9497-3
Xie, Q. & Ren, B. (2022). Pollution & risk assessment  of heavy metals in rivers in the antimony capital of Xikuangshan. Sci. Rep., 12; 14393. https://doi.org/10.1038/s41598-022-18584-z
Yakovlev, E., Druzhinina, A., Druzhinin, S., Zykov, S. & Ivanchenko, N. (2022). Assessment of physical & chemical properties, health risk of trace metals & quality indices of surface waters of the rivers & lakes of the Kola Peninsula (Murmansk Region, North-West Russia). Environ. Geochem. Health, 44(8); 2465–2494. https://doi.org/10.1007/s10653-021-01027-5
Yakubu, A. (2016). Analysis of productivity among maize farmers in Doguwa local government area of Kano State, Nigeria. Unpublished doctoral dissertation. Department of Agricultural Economics & Rural Sociology, Faculty of Agriculture, Ahmadu Bello University Zaria, Kaduna State, Nigeria.
Yuan, G. L., Liu, C., Chen, L. & Yang, Z. (2011). Inputting history of heavy metals into the inland lake recorded in sediment profiles: Poyang Lake in China. J. Hazard. Mater., 185(1); 336–345. https://doi.org/10.1016/j.jhazmat.2010.09.039
Yuan, Y., Zhang, C., Zeng, G., Liang, J., Guo, S., Huang, L., Wu, H. & Hua, S. (2016). Quantitative assessment of the contribution of climate variability & human activity to streamflow alteration in Dongting Lake, China. Hydrol.  Process, 35; 70-95. https://doi.org/10.1002/hyp.10768
Yuanan, H., He, K., Sun, Z., Chen, G. & Cheng, H. (2020). Quantitative source apportionment of heavy metal(loid)s in the agricultural soils of an industrializing region & associated model uncertainty. J. hazard. Mater., 391; 122244. https://doi.org/10.1016/j.jhazmat.2020.122244
Zakhem, B.A. & Hafez, R. (2015). Heavy metal pollution index for groundwater quality assessment in Damascus Oasis, Syria. Environ. Earth Sci., 73; 6591-6600. https://doi.org/10.1007/s12665-014-3882-5
Zakir, H. M., Sharmin, S., Akter, A. &  Raheavy metalana, S. (2020). Assessment of health risk of heavy metals & water quality indices for irrigation & drinking suitability of waters: A case study of Jamalpur Sadar area Bangladesh. Environ. Adv., 2; 100005. https://doi.org/10.1016/j.envadv.2020.100005
Zeng, G., Liang, J., Guo, S., Shi, L., Xiang, L., Li, X. & Du, C. (2009). Spatial analysis of human health risk associated with ingesting manganese in Huangxing Town, Middle China. Chemosphere, 77(3); 368–375. https://doi.org/10.1016/j.chemosphere.2009.07.020
Zeng, J., Han, G. & Yang K. (2020). Assessment & sources of heavy metals in suspended particulate matter in a tropical catcheavy metalent, Northeast Thailand. J. Clean. Prod., 265; 121898. https://doi.org/10.1016/j.jclepro.2020.121898
Zhang, S., Liu, G., Sun, R. & Wu, D. (2016). Health risk assessment of heavy metals in groundwater of coal mining area: A case study in Dingji coal mine, Huainan coalfield, China. Hum. Ecol. Risk Assess., 22 (7); 1469-1479. https://doi.org/10.1080/10807039.2016.1185689
Zhao, J., Fu, G., Lei, K. & Li, Y. (2011). Multivariate analysis of surface water quality in the Three Gorges area of China & implications for water management. J. Enviro. Sci. (China), 23(9), 1460–1471. https://doi.org/10.1016/s1001-0742(10)60599-2