Heavy Metal and Microbial Contaminants of Some Vegetables Irrigated With Goo Reservoir Water, Navrongo, Ghana

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Theophilus Atio, Abalori
Conrad Atogi-Akwoa, Weobong


Globally, the safety of vegetables for consumption is becoming an increasing concern to consumers because of the risk associated with eating of vegetables contaminated with heavy metals and microbial organisms. An assessment of the extent of microbial contamination and also levels of heavy metals and the risk associated with the consumption of the vegetables irrigated with polluted Goo reservoir water in the Navrongo municipality was carried out. Site A used the channel flooding irrigation method whilst site B used watering cans for watering during the latter part of the dry season when the pressure of the water is low. A total of 128 vegetables samples were taken for microbial and heavy metals determination each. Samples of leafy vegetable and fruit vegetables were randomly taken from the two sites for microbial and heavy metal analysis. The reservoir was divided to North, South, East and West and water samples taken from each location. The concentrations of heavy metals in the reservoir exceeded the Food and Agricultural Organization (FAO) recommended levels of metals in water for irrigation. Site B recorded the highest microbial counts likewise heavy metal contaminants in the sampled vegetables. Levels of cadmium in the vegetables exceeded the World Health Organization/FAO permissible levels. Copper (Cu) had the highest concentration in both sites. Faecal Coliform (FC) levels in the vegetables were above the International Commission on Microbiological Specifications for Food (ICMSF) allowable limits. The high quantities of Total Coliform, Faecal Coliform, E. coli, helminthes eggs and salmonella contamination of the vegetables indicate high risk of getting diseases through the consumption of these vegetables. The hazard quotient of all the metals exceeded one in both sites except Zinc (Zn). The hazard index (HI) of heavy metals studied was above one in both sites, indicating they could have adverse health effect to human life. The analysis showed there was significant difference in microbial counts and levels of heavy metals in the vegetables in the two different sites. The consumers of these vegetables were at risk of contracting water-borne diseases like typhoid fever, cholera among others and also a high risk of heavy metal poisoning especially from cadmium.

Parasitic helminthes, pathogen, salmonella SPP, risk assessment, consumption, polluted runoff

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How to Cite
Abalori, T. A., & Weobong, C. A.-A. (2020). Heavy Metal and Microbial Contaminants of Some Vegetables Irrigated With Goo Reservoir Water, Navrongo, Ghana. Journal of Agriculture and Ecology Research International, 21(10), 11-24. https://doi.org/10.9734/jaeri/2020/v21i1030170
Original Research Article


D’Mello JPF. Food safety: Contaminants and toxins. CABI Publishing, Wallingford, Oxon, UK, Cambridge, MA. 2003;480.

Zandstra BH, De Kryger TA. Arsenic and lead residues in carrots from foliar applications of monosodium methanearosonate (MSMA): A comparison between mineral and organic soils, or from soilresidues. Food Addit. Contam. 2007; (24):34-42.

Amoah P, Drechsel P, Abaidoo RC. Pesticide and microbiological contamination of vegetables in Ghana’s urban markets. Arch. Environ. Contam. Toxicol. 2006;( 50):1-6.

Johannessen GS, Loncarevic S, Kruse H. Bacteriological analysis of fresh produce in Norway. Int. J. Food Microbiol. 2002; (77):199-204.

AdeOluwa OO, Cofie O. Urine as an alternative fertilizer in agriculture: Effects in amaranths (Amaranthus caudatus) production in Nigeria. Renew. Agric. Food Syst. 2012;27(4):287- 294.

Alhabbal AT. The prevalence of parasitic contamination on common cold vegetables in Alqalamoun Region. Int. J. Pharm Sci. Rev. Res. 2015;30(1):94–97.

Alade GO, Alade TO, Adewuyi IK. Prevalence of intestinal parasites in vegetables sold in Ilorin, Nigeria. Am Eur J. Agric Environ Sci. 2013;13(9):1275–1282.

Ul-Haq S, Maqbool A, Javed Khan U, Yasmin G, Sultana R. Parasitic contamination of vegetables eaten raw in Lahore, Pakistan. J. Zool. 2014;46(5): 1303–1309.

Sunil B, Thomas D, Latha C, Shameem H. Assessment of parasitic contamination of raw vegetables in Mannuthy, Kerala state, India. Vet World. 2014;7(4):253–256.

Olyaei A, Hajivandi L. Parasitological contamination of markets and farms in vegetables consumed in southern Iran. Global Veterinaria. 2013;10(33):27–31.

Siegel KR, Ali MK, Srinivasiah A, Nugent RA, Narayan KMV. Do we produce enough fruits and vegetables to meet global health need? PLoS One. 2014;9:e104059.

Wang XL, Sato T, Xing BS, Tao S. Health risks of heavy metals to the general public in Tianjin, China via consumption of vegetables and fish. Sci Total Environ. 2005;(350):28-37.

Jolly YN, Islam A, Akbar S. Transfer of metals from soil to vegetables and possible health risk assessment. Springer Plus. 2013;3(2):85–91.

Jarup, L. Hazards of heavy metal contamination. Br Med Bull. 2003;(68): 167–82.

Liu H, Probst A, Liao B. Metal contamination of soils and crops affected by the Chenzhou lead/zinc mine spill (Hunan, China). Sci Total Environ. 2005;1 (339):53–66.

Huang SS, Liao QL, Hua M, Wu XM, Bi KS, Yan CY, Chen B, Zhang XY. Survey of heavy metal pollution and assessment of agricultural soil in Yangzhong district, Jiangsu Province, China. Chemosphere. 2007;21( 67):48–55.

Bortey-Sam N, Nakayama SMM, Ikenaka Y, Akoto O, Baidoo E, Yohannes YB,Mizukawa H, Ishizuka M. Human health risks from metals and metalloid via consumption of food animals near gold mines in Tarkwa, Ghana: Estimation of the daily intakes and target hazard quotients (THQs). Ecotoxicol Environ Saf. 2015; (111):160–170.

US environment protection agency control of pathogens and vector attraction in sewage sludge. USEPA Environmental Regulations and Technology, Office of Research and Development. 1999;177.

US environmental protection agency’s integrated risk information system (USEPA IRIS). Environmental protection agency region I, Washington DC 20460. US EPA; 2011.

Wongsasuluk P, Chotpantarat S, Siriwong W, Robson M. Heavy metal contamination and human health risk assessment in drinking water from shallow groundwater wells in an agricultural area in Ubon Ratchathani province, Thailand. Environ Geochem Health. 2014;(36):169–182.

Lim HS, Lee JS, Chon HT, Sager M. Heavy metal contamination and health risk assessment in the vicinity of the abandoned Songcheon au–ag mine in Korea. J Geochem Explor. 2008;(96):223 -230.

World health organization. Health guidelines for the use of wastewater in agriculture and aquaculture. Geneva, Switzerland: World Health Organization; 1989.

Ayers RS, Westcot DW. Water quality for agriculture. FAO Irrigation and Drainage Paper 29 Rev.1; FAO: Rome, Italy, 1985;(29).
ISBN 92-5-102263-1.

Cornish GA, Mensah E, Ghesquière P. Water quality and Peri-urban irrigation. An assessment of surface water quality for irrigation and its implications for human health in the Peri-urban Zone of Kumasi, Ghana. report OD/TN 95. HR Wallingford Ltd, Wallingford, UK; 1999.

Girmayer B, Ameha K, Sissay M. Assessment of bacteriological contaminants of some vegetables irrigated with Awash River water in selected farms around Adama town, Ethiopia. Journal of Microbiology and Antimicrobials. 2014; 6(2):37-42.

Weobong CA. Distribution and seasonality of microbial indicators of pollution in Subin, an urban river in Kumasi, Ghana.Msc Thesis. Kwame Nkrumah University of Science and Technology, Kumasi, Ghana; 2001.

Keraita B, Silverman A, Amoah P, Asem-Hiablie S. Quality of irrigation water used for urban vegetable production. In P. Drechsel & B. Keraita (Eds.), Irrigated urban vegetable production in Ghana: Characteristics, benefits and risk mitigation (second edition). International Water Management Institute: Colombo, Sri Lanka; 2014.

Solomon BE, Yaron S, Mathews RK. Transmission of E. coli 0157:H7 from contaminated manure and irrigation water to lettuce plant tissue and its subsequent internalization. Applied and Environmental Microbiology. 2002;68(1): 397–400.

Nkere KC, Ibe IN, Iroegbu UC. Bacteriological quality of foods and water sold by vendors and in restaurants in Nsukka, Enugu State, Nigeria: A comparative study of three microbiological methods. Journal of Health, Population and Nutrition. 2011;29(6):560–566.

World health organization. Guidelines for the safe use of wastewater, excreta and grey water: Wastewater use in agriculture (Vol. 2). Geneva, Switzerland: World Health Organization; 2006.

Seidu R, Heistad A, Amoah P, Drechsel P, Jenssen PD, Stenstrom TA. Quantification of the health risk associated with wastewater reuse in Accra, Ghana: A contribution toward local guidelines. Journal of Water and Health. 2008;6( 4).

Drechsel P, Seidu R. Cost-effectiveness of options for reducing health risks in areas where food crops are irrigated with wastewater. Water International. 2011; 36(4):535–548.

Ghana Statistical Services (GSS). Ghana demographic and health survey 2003. Calverton: GSS, Noguchi Institute, ORC Marcro; 2004.

Wei CL, Huang TS, Lin WF, Tamplin ML, Bartz JA. Growth and survival of Salmonella montevideo on tomatoes and disinfection with chlorinated water. Journal of Food Protection.1995;58(8):829–836.

Pru ¨ss-Ustun A, Bos R, Gore F, Bartram J. Safer water, better health: Costs, benefits and sustainability of interventions to protect and promote health. Geneva: World Health Organization; 2008.

World Health Organization / Food and Agricultural Organization (WHO/FAO). Expert committee on food additives. Cambridge: Cambridge University Press. 2007;329–360.

Ametepey ST, Cobbina SJ, Akpatey FJ, Duwiejuah AB. Health risk assessment and heavy metal contamination levels in vegetables from Tamale Metropolis, Ghana. International Journal of Food Contamination. 2018;5:5.

Odai SN, Mensah E, Sipitey D, Ryo S, Awauah E. Heavy metals uptake by vegetables cultivated on urban waste dumpsites: case study of Kumasi, Ghana. Res J Environ Toxicol. 2008;2(2):92–99.

Sharma RK, Agrawal M, Marshall FM. Heavy metals contamination of soil and vegetables in suburban areas of Varanasi, India. Ecotox Envir Saf. 2007;66:258–66.

Weldegebriel Y, Chandravanshi BS, Wondimu T. Concentration levels of metals in vegetables grown in soils irrigated with river water in Addis Ababa, Ethiopia. Ecotox Envir Saf. 2012;77:57–63.

World Health Organization [WHO]. Evaluation of certain food additives and Contaminants. In: Sixty-First Report of the Joint FAO/WHO Expert Committee on Food Additives. Geneva: WHO; 2004. (WHO Technical Series, 922).

Suruchi PK. Assessment of heavy metal contamination in different vegetables grown in and around urban areas. Res J. Environ Toxicol. 2011;5(3):162–79.

Lente I, Keraita B, Drechsel P, Ofosu-Anim J, Brima AK. Risk assessment of heavy metal contamination on vegetables grown in long-term wastewater irrigated urban farming sites in Accra, Ghana. Water Qual Expo Health. 2012;4:179–186.

Rajkovic MB, Lacnjevac CM, Ralevic NR,Stojanovic MD, Toskovic DV, Pantelic GK, Ristic NM, Jovanic S. Identification of metals (heavy and radioactive) in drinking water by indirect analysis method based on scale tests. Sensors. 2008;(8):2188-2207.

Martin S, Griswold W, Human health effects of heavy metals, in environmental science and technology briefs for citizens, center for Hazardous Substance Research, Manhattan, Kan, USA. 2009; (15):1-6.

Ulla R, Khader JA, Hussain I, AbdElsalam NM, Talha M,Khan N. Investigation of macro and micro-nutrients in selected medicinal plants. African Journal of Pharmacy and Pharmacology. 2012;25(6): 1829–1832.

Johnson FM. The genetic effects of environmental lead. Mutation Research—Reviews in Mutation Research. 1998; 2(410):123–140.

Agency for toxic substances and disease registry (ATSDR),toxicological profile for lead (Update), public health service, U.S. Department of Health and Human Services, Atlanta, Ga, USA; 2007.

Orisakwe O, Nduka JK, Amadi CN, Dike D, Obialor OO. Evaluation of potential dietary toxicity of heavy metals of vegetables. Journal of Environmental & Analytical Toxicology. 2012;3( 2):136–139.

Verma P, George KV, Singh HV, Singh RN, Modeling cadmium accumulation in radish, carrot, spinach and cabbage. Applied Mathematical Modelling. 2007;8(31):1652- 1661.

Khan CS, Cao Q, Zheng YM, Huang YZ, Zhu YG. Health risks of heavy metals in contaminated soils and food crops irrigated with wastewater in Beijing, China. Environmental Pollution. 2008;3(152): 686–692.

Huang ML, Zhou SL, Sun B, Zhao Q. Heavy metals in vegetables: Assessment of potential health risk for inhabitants in Khunshan China. Sci Tota Env. 2008; 405:54–61.

Zhou H, Yang WT, Zhou X, Liu L, Gu JF, Wang WL, Zou JL, Tian T, Peng PQ, Liao, BH. Accumulation of heavy metals in vegetable species planted in contaminated soils and the health risk assessment. Int. J. Environ Res Public Health. 2016;13(289): 1–12.

Harmanescu M, Alda LM, Bordean DM, Gogoasa L, Gergen L. Heavy metals health risk assessment for population via consumption of vegetables grown in old mining area, a case study: Banat County, Romania. Chem Cent J. 2011;5:64–73.