Main Article Content
Communication In Physical Sciences 2020, 5(2): 124 -135
Authors: Jude C. Nnaji, and E. Chukwu
Received 15 March 2020/Accepted 28 April 2020
Ecological risk assessment of heavy metals at five dumpsites (1 – 5) in Umuahia, Nigeria was carried out. Soil samples were collected at distances of 0, 5 and 10 m from each dumpsite and from a control site. Samples of water leaf and African Spinach leaf
were also collected and analysed for heavy metal ions. Soil physicochemical parameters were determined using official and recommended methods while heavy metal ion concentrations were determined using Atomic Absorption Spectrophotometer. Results obtained indicated that the texture of soil samples were predominantly sandy loam while pH values ranged from 6.21±0.37 to 7.70±0.29. Organic matter content ranged from 1.65±0.52 to 4.15±0.36 % while electrical conductivity had a range of 98.47±7.25 – 201.57±15.86µS/cm across the dumpsites. Mean concentrations of heavy metal ions in soils from the dumpsites were
significantly higher (P < 0.05) than those from the control site. Average metal pollution indices showed that soils in the dumpsites are unpolluted except cadmium in Dumpsites 4 and 5. Degree of contamination values showed low degrees of contamination but enrichment factors for Pb, Cd and Cr in some Dumpsites indicated significant enrichments. All dumpsites had geo-accumulation indices less than 1.00 indicating unpolluted soil except Pb and Cr in some Dumpsites which showed moderate pollution. Ecological risk and potential ecological risk indices indicated low ecological risk. Mean concentrations of cadmium ions in the two vegetables from the dumpsites exceeded the Codex maximum limits for Cd in leafy vegetables. Although severe pollution is not pronounced for soils within the study dumpsites, it is recommended that measures should be engaged to control waste disposal in these dumpsites since heavy metals can bioaccumulate and increase in concentration to severe the environmental quality of the
dumpsites in the near future.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Adamcová, D., Vaverková, M. D., Barton, S., Havlícek,
Z. & Broušková E. (2016). Soil contamination in
landfills: a case study of a landfill in Czech Republic.
Solid Earth, 7, pp. 239–247.
Adefemi, S. O. & Awokunmi, E. E. (2009). The impact
of municipal solid waste disposal in AdoEkiti
metropolis, Ekiti-State, Nigeria. African Journal of
Environmental Science and Technology, 3, pp. 186-
Adelekan, B. & Abegunde, K. (2011). Heavy metal
contamination of soil and ground water at
automobile mechanic village in Ibadan, Nigeria.
International Journal of the Physical Sciences, 6, 5,
Agbenin, J. O. (1995). Laboratory Manual for Soil and
Plant Analysis. Dept. of Soil Science, Ahmadu Bello
University, Zaria, pp. 30-72.
Ahmad, I., Akhtar, M. J., Zahir, Z. A. & Jamil A.
(2012). Effect of cadmium on seed germination and
seedling growth of four wheat (Triticum
aestivum L.) cultivars. Pakistan Journal of Botany,
, 5, pp. 1569–1574.
Ajiboso, T., Olayinka, K. O. & Alo, B. I.
(2003). Speciation of heavy metal contaminants at
metal dumpsites by improved sequential
fractionation technique. Journal of Nigerian
Environmental Society, 1, pp. 178-186.
Akaeze, C.S. (2001). Solid wastes analysis
characterization and management along Abak/Ikot
Ekpene roads of Uyo metropolis. A research project.
Dept. Chemistry, University of Uyo, Nigeria.
Akter, S., Islam, S. M. A., Rahman, M. O., Mamun, K.
M. & Jolly Y.N. (2019). Toxic Elements
Accumulation in Vegetables from Soil Collected
from the Vicinity of a Fertilizer Factory and PossibleHealth Risk Assessment. Open Access Journal of
Biomedical Engineering and Biosciences, 3, 2, pp.
Amusan, A. A., Ige, D.V. & Olawale, R. (2005).
Characteristics of Soils and Crops’ Uptake of Metals
in Municipal Waste Dump Sites in Nigeria. Journal
of Human Ecology, 17, 3, pp. 167-171.
APHA (2012). Standard Methods for the Examination
of Water and Wastewater, 22nd Edition. American
Public Health Association, American Water Works
Association, Water Environment Federation,
Agency for Toxic Substances and Disease Registry.
(2007). Public Health Statement: Lead. ATSDR
Report CAS#: 7439-92-1.
Awokunmi, E.E., Asaolu, S.S. & Ipinmoroti, K.O.
(2010). Effect of leaching on heavy metals
concentration of soil in some dumpsites. African
Journal of Environmental Science and Technology,
, 8, pp. 495-499.
Azeez, J. O., Hassan, O. A. & Egunjobi, P. O.
(2011). Soil contamination at dumpsites:
implication of soil heavy metals distribution in
municipal solid waste disposal system: a case study
of Abeokuta, Southwestern Nigeria. Soil and
sediment contamination International Journal, 20,
, pp. 370-386.
Bouyoucos, G. J. (1962). Improved hydrometer method
for making particle size analysis of soils. Agronomy
Journal, 54, pp. 464-465.
Chinedu, I., Ezeibe, C., Anijiofor, S. C. & Daud, N. N.
(2018). Solid Waste Management in Nigeria:
Problems, Prospects, and Policies. Journal of Solid
Waste Technology and Management, 44, 2, pp.163-
Chinyere, G. C. & Madu, F. U. (2015).
Physicochemical characteristics and heavy metal
constituents of five dumpsite soils and edible
vegetables grown in two major metropolises of Abia
State, Nigeria. International Research Journal of
Biochemistry and Biotechnology, 2, 2, pp. 014-027.
Codex Alimentarius Commission. (2015). General
Standard for Contaminants and Toxins in Food and
Feed (CODEX STAN 193-1995) - Amended 2015.
Ebong, G. A, Ettesam, E. S. & Dan, E. U. (2020).
Impact of abattoir wastes on trace metal
accumulations, speciation and human health-related
problems in soil within Southern Nigeria. Air Soil
and Water Research, 13, pp. 1-14.
Eddy N. O. (2004). Physicochemical parameter of
water and heavy metal content of water, sediment
and fishes from Qua Iboe River Estuary. M.Sc
Thesis, Michael Okpara University of Agriculture,
Umudike, Nigeria. Retrieved from:
Eddy, N. O., Ndibuke, M. O. & Ndibuke, E. O. (2004).
Heavy metals in sediment from Cross River at Oron.
African Journal of Environmental Pollution and
Health, 3, 5, pp. 21-26.
Eddy, N. O., Odoemelam, S. A. & Mbaba, A. (2006).
Elemental composition of soil in some dumpsites.
Electronic Journal of Environmental, Agriculture
and Food Chemistry, 5, 3, pp. 1349-1363.
Elaigwu, S.E., Ajibola, V.O. & Folaranmi, F.M. (2007).
Studies on the Impact of Municipal Waste Dump on
Surrounding Soil and Air Quality of Two Cities in
Northern Nigeria. Journal of Applied Sciences, 7, 3,
Elith, M & Garwood, S. (2001). Investigations into the
levels of Heavy metals within Manly Dam
catchment. Freshwater Ecology Report 2001.
Department of Environmental Sciences, University
of Technology, Sydney.
Fatoba, P.O., Adepoju, A.O. & Okewole, G.A. (2012).
Heavy metal accumulation in the fruits of tomato
and okra irrigated with industrial waste effluents.
Journal of Industrial Pollution and Control, 28, 2,
Hakanson, L. (1980). Ecological risk index for aquatic
pollution control, a sedimentological approach.
Water Research, 14, pp. 975–1001.
Huu, H.H., Rudy, S. & Damme, A.V. (2010).
Distribution and contamination status of heavy
metals in estuarine sediments near Cau Ong Harbor,
Ha Long Bay, Vietnam. Geologica Belgica, 13, pp.
Ikpe, A. E., Ebunilo, P. O. & Sadjere, G. E. (2019).
Effects of waste dumpsites on geotechnical
properties of the underlying soils in wet season.
Environmental Engineering Research, 24, 2, pp.
Jung, H.G. & Casler, M.D. (2006). Maize stem tissues:
impact of development on cell wall degradability.
Crop Science, 46, 4, pp. 1801.
Lacatusu R. (2000). Appraising levels of soil
contamination and pollution with heavy metals.
European Soil Bureau Research Report, 4, pp. 393-
Lu, X., Wang, L., Lei, K., Huang, J. & Zhai, Y., (2009).
Contamination assessment of copper, lead, zinc,
manganese and nickel in street dust of Baoji, NW
China. Journal of Hazardous Materials, 161, pp.
Mohajeri, S., Aziz, M., Zahed, M.A. & Adlan, M.N.
(2010). Statistical optimization of process
parameters for landfill leachate treatment using
electro-Fenton technique. Journal of Hazardous
Materials, 176, pp.749–758.
Nagajyoti, P. C., Lee, K. D. & Sreekanth, T. V. M.
(2010). Heavy metals, occurrence and toxicity for
plants: a review. Environ. Chem. Lett, 8, pp. 199–
National Population Commission (NPC). (2006).
Population and Housing Census, “Population
distribution by Sex, State, LGA, and Senatorial
district”. Retrieved from: Retrieved from:
Obasi, N. A., Akubugwo, E. I., Kalu, K. M. & Ugbogu,
O. C. (2013). Speciation of Heavy Metals and Phytoaccumulation Potentials of Selected Plants on Major
Dumpsites in Umuahia, Abia State, Nigeria.
International Journal of Current Biochemistry
Research, 1, 4, pp. 16- 28, 18.
Odoemelam, S. A. & Eddy, N. O. (2009). Studies on the
use of oyster, snail and periwinkle sheels as
adsorbent for the removal of Pb2+
.. Journal of
Chemistry, 5, 1, pp. 213-222.
Ogbonna, D N, Igenijie, M. & Isirimah, N. O. (2007).
Microbiological and Physicochemical
Characteristics of the soils of waste collection sites
in Port Harcourt city, Nigeria. Nigerian Journal of
Soil Science, 16, pp. 162 – 167.
Ogunbanjo, O., Onawumi, O., Gbadamosi, M.,
Ogunlana, A. & Anselm, O. (2016). Chemical
speciation of some heavy metals and human health
risk assesse,ent in soil around two municipal
dumpsites in Sagamu, Ogun State, Nigeria.
Chemical Speciation and Bioavailability, 28, -4, pp.
Olabanji, I. O., Oluyemi, E. A. & Obianjuwa, E. I.
(2015). Nondestructive analysis of dumpsite soil
and vegetable for elemental composition. Journal of
Environmental Chemistry and Ecotoxicology,7, pp.
Oluyemi, E. A., Feuyit, G., Oyekunle, J. A. O. &
Ogunfowokan, A. O. (2008). Seasonal variations in
heavy metal concentrations in soil and some selected
crops at a landfill in Nigeria. African Journal of
Environmental Science and Technology, 2, 5, pp. 89-
Omoniyi, K. I., Ekwumemgbo, P. A, & Sanni, H. A.
(2013). An evaluation of the As, Cd, Mn and Hg
contamination in soils and plants (Amaranthus
spinusis) of Kaduna Metropolis dumpsites. Physical
Review and Research International, 3, 4, pp. 541-
Opaluwa, O., D., Aremu, M. O., Ogbo, L., O., Abiola,
K., A., Odiba, I.,E., Abubakar, M. M. & Nweze, N.
O. (2012). Heavy metal concentrations in soils, plant
leaves and crops grown around dump sites in Lafia
Metropolis, Nasarawa State, Nigeria. Advances in
Applied Science Research, 3, 2, pp. 780-784.
Parameswari, K., Padmini, T. K. & Mudgal, B. V.
(2015). Assessment of Soil Contamination around
Municipal Solid Waste Dumpsite. Indian Journal of
Science and Technology, 8, 36, pp. 1-5.
Rafizul, M., Alamgir, I. M. & Shahed-Sharif, S. M.
(2012). Analysis and Selection of Appropriate
Aggregation Function for Calculating of Leachate
Pollution Index of Landfill Lysimeter. Iranica
Journal of Energy and Environment, 3, pp. 370-379.
Rubio, B., Nombela, M. A. & 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, pp. 968–980.
Shah, A., Niaz A., Ullah N., Rehman A., Akhlaq M.,
Zakir M. & Khan M. S. (2013). Comparative study
of Heavy Metals in Soil and Selected Medicinal
Plants. Journal of Chemistry, 2013, pp. 1-6.
Tchounwou, P. B., Yedjou, C. G., Patlolla, A. K. &
Sutton D. J. (2012). Heavy Metals Toxicity and the
Environment. EXS, 101, pp. 133–164.
Uba, S., Uzairu, A., Harrison, G. F. S., Balarabe, M. L.
& Okunola, O. J. (2008). Assessment of heavy
metals bioavailability in dumpsites of Zaria
metropolis, Nigeria. African Journal of
Biotechnology, 7, 2, pp. 122-130.
Udeme, A.E. (2001). Solid waste analysis and
characterization. Department of chemistry,
University of Uyo.
Ukpong, E. C., Antigha, R. E. & Moses, E. O. (2013).
Assessment of heavy metals content in soils and
plants around waste dumpsites in Uyo Metropolis,
Akwa Ibom State. International Journal of
Engineering and Science, 7, 2, pp. 2319 – 1805.
Ukpong, E. C; Udo, E. A. & Umoh, I. C. (2015).
Characterization of Materials from Aba Waste
Dumpsites. International Journal of Engineering
and Applied Sciences, 6, 3, pp. 1-10.
Umoren, I. U., Udoh, A. & Udousoro, I. I. (2007).
Concentration and chemical speciation for the
determination of Cu, Zn, Ni, Pb and Cd from refuse
dump soils using the optimized BCR sequential
extraction procedure. Environmentalist, 27, pp. 241-
Wang, A. S., Angle, J. S., Chaney, R. L., Delorme, T.
A. & Reeves, R. D. (2006). Soil pH effects on uptake
of Cd and Zn by Thlaspi caerulescens. Plant and
Soil, 281, 1-2, pp. 325–337.
Waste Atlas. (2014). The World’s 50 biggest
Dumpsites. Retrieved from:
Yang, Z., Ying, W. & Shen, Z. (2009). Distribution and
speciation of heavy metals in sediments from the
mainstream, tributaries, and lakes of the Yangtze
River catchment of Wuhan, China. Journal of
Hazardous Materials, 166, pp. 1186–1194.
Yargholi, B., Azimi, A. A., Baghvand, A., Liaghat, A.
M. & Fardi, G. A. (2008). Investigation of cadmium
absorption and accumulation in different parts of
some vegetables. American–Eurasian Journal
of Agriculture and Environment Science, 3, pp. 357–
Zaware, S. G. (2014). Environmental impact
assessment on soil pollution issue about human
health. International Research Journal of
Environment Sciences, 3, pp. 78-81.