The spatial distribution of soil lead pollution in the Middle Mukuvisi Catchment, Harare, Zimbabwe

Boycen Kumira Mudzengi

Abstract
This research determined the spatial variation in soil lead pollution in the Middle Mukuvisi Catchment in Harare. Lead is one of the commonest urban pollutants and it induces negative effects on biophysical resources and humans. Part of the study area has been target of landfill programmes dating back to the 1950s. It is also subjected to industrial discharges from the Graniteside and Masasa Industrial Areas. The study catchment was stratified into two strata namely: Strata A (8 x 105 m²) and Strata B (10 x 105 m²) upstream and downstream with respect of the centre of the landfilled area respectively. These strata were digitized in Arc View Geographic Information System (GIS). Stratification enabled the testing of differences in soil lead pollution levels in the two study strata. Thirty soil samples were then collected from random points in the study area for laboratory chemical analysis. Fifteen points were randomly selected for each stratum. The results showed that soil lead concentration varies spatially in the study catchment. In comparison the strata upstream has lower average soil lead concentration than strata downstream with respect to the centre of the landfilled area. However, the difference in soil lead concentration between the two strata is not significant (p > 0.05). This can be explained by introduction of lead into the study catchment by other sources of pollution upstream such as Masasa Industrial Area. The other sources of lead into the study strata besides landfill leachate can be leakages from fuel stations and leaded fuel spillages from vehicles. It is anticipated further research in this area will contribute to the sustainable utilization of urban river catchments, especially where they are used for dumping wastes.

Keywords
Soil lead pollution; Landfill; Leachate; Vegetation stress; Lead poisoning.

DOI
10.21472/bjbs.050905

Full text
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References
Beavington, F. Contamination of soil with zinc, copper, lead and cadmium in the Wollongong City area. Australian Journal of Soil Research, v. 11, p. 7-31, 1973. https://doi.org/10.1071/SR9730027

Chenje, M.; Sola, L.; Paleczny, D. (Eds.). The State of Zimbabwe's Environment 1998. Harare: Government of the Republic of Zimbabwe, Ministry of Mines, Environment and Tourism, 1998.

Davies, B. E. Plant-available lead and other metals in British garden soils. Science of the Total Environment, v. 9, p. 243- 262, 1978.

Davies, B. E.; Conway, D.; Holt, S. Lead pollution of London soils: a potential restriction on their use for growing vegetables. The Journal of Agricultural Science, v. 93, no. 3, p. 749-752, 2009. https://doi.org/10.1017/S0021859600039162

Davies, B. E.; Holmes, P. L. Lead contamination of roadside soil and grass in Birmingham, England, in relation to naturally occurring levels. The Journal of Agricultural Science, v. 79, p. 479-484, 1972. https://doi.org/10.1017/S0021859600025843

Dolk, H.; Vrijheid, M. The impact of environmental pollution on cogenital anomalies. British Medical Bulletin, v. 68, p. 25-45, 2003. https://doi.org/10.1017/S0021859600025843" target="_blank">https://doi.org/10.1093/bmb/ldg024

Fleming, G. A.; Parle, P. J. Heavy metals in soils, herbage and vegetables from an industrialised area west of Dublin city. Irish Journal of Agricultural Research, v. 16, no. 1, p. 35-48, 1977.

Horler, D. N. H.; Barber, J.; Barringer, A. R. New concepts for the detection of geochemical stress in plants. Proceeding of the Eighth Annual Conference of the Remote Sensing Society. Reading: The College of St. Mark and St. John Foundation, Reading, 1980.

Karrari, P.; Mehrpour, O.; Abdollahi, M. A systematic review on status of lead pollution and toxicity in Iran; Guidance for preventive measures. DARU Journal of Pharmaceutical Sciences, 20:2, 2012. https://doi.org/10.1186/1560-8115-20-2

Klein, L. River pollution: Causes and effects. London: Butterworths, 1962.

Lei, M.; Tei, B.; Williams, P. N.; Zheng, Y.; Yuang, Y. Arsenic, cadmium, and lead pollution and uptake by rice (Oryza sativa L.) grown in greenhouse. Journal of Soils and Sediments, v. 11, no. 1, p. 115-123, 2011. https://doi.org/10.1007/s11368-010-0280-9>

Lu, C. M.; Chau, C. W.; Zhang, J. H. Acute toxicity of excess mercury on the photosynthetic performance of cyanobacterium, S. platensis: Assessment by chlorophyll fluorescence analysis. Chemosphere, v. 41, n. 1/2, p. 191-196, 2000. https://doi.org/10.1016/S0045-6535(99)00411-7

Mathuthu, A. S.; Zaranyika, M. F. Water quality assessment by monitoring physical and chemical parameters and heavy metal pollution in Mukuvisi river in Zimbabwe. Harare: University of Zimbabwe Publications, 1997.

Mishra, D. R.; Narumalani, S.; Rundquist, D.; Lawson, M. Characterizing the vertical diffuse attenuation coefficient for down swelling irradiance in coastal waters: Implications for water penetration by high resolution satellite data. ISPRS Journal of Photogrammetry and Remote Sensing, v. 60, no. 1, p. 48-64, 2006. https://doi.org/10.1016/j.isprsjprs.2005.09.003

Nicholson, F. A.; Smith, S. R.; Alloway, B. J.; Carlton-Smith, L.; Chambers, B. J. An inventory of heavy metals inputs to agricultural soils in England and Wales. The Science of the Total Environment, v. 311, p. 205-219, 2003. https://doi.org/10.1016/S0048-9697(03)00139-6

Peirce, J. J.; Weiner, R. F.; Vesilind, P. A. Environmental pollution and control. Boston: Butterworth-Heinemann, 1998.

Reddy, A. M.; Kumar, S. G.; Jyonthsnakumari, G.; Thimmanaik, S.; Sudhakar, C. Lead induced changes in antioxidant metabolism of horsegram (Macrotyloma uniflorum Lam. Verdc.) and bangalgram (Cicer arietinum L.). Chemosphere, v. 60, no. 1, p. 97-104, 2005. https://doi.org/10.1016/j.chemosphere.2004.11.092

Samson, G.; Morisette, J.C.; Popovic, R. Copper quenching of the variable fluorescence in Dunaliella tertiolecta. New evidence for a copper inhibition effect on PSII photoinhibitory. Photochemistry and Photobiology, v. 48, no. 3, p. 329-332, 1988. https://doi.org/10.1111/j.1751-1097.1988.tb02829.x

Singer, M. J.; Munns, D. N. Soils: An introduction. New Jersey: Prentice Hall, 1966.

Singh, D. P.; Khare, P.; Bisen, P. S. Effect of Ni2+, Hg2+ and Cu2+ on growth, oxygen evolution and photosynthetic electron transport in Cylindrospermum IU 942. Journal of Plant Physiology, v. 134, p. 406-412, 1989.

Smith, K. L.; Steven, M. D.; Colls, J. J. Use of hyperspectral derivative ratios in the red-edge region to identify plant stress responses to gas leaks. Remote Sensing of Environment, v. 92, no. 2, p. 207-217, 2004. https://doi.org/10.1016/j.rse.2004.06.002

Warren, H. V.; Dela Vault, R. E.; Fletcher, K. W. Metal pollution: A growing problem in industrial and urban areas. Canadian Mining & Metallurgical Bulletin, v. 7, p. 1-12, 1971.

Zaranyika, M. F.; Mtetwa, L.; Zvomuya, S.; Gongora, G.; Mathuthu, A. S. The effect of industrial effluent and leachate on the levels of selected trace heavy metals in the waters of Upper and Middle Mukuvisi River in Harare, Zimbabwe. Bulletin of Chememical Society of Ethiopia, v. 7, n. 1, p. 1-10, 1993. Available from: <https://www.ajol.info/index.php/bcse/article/view/78407/68767. Accessed on: Jan. 21, 2018.

Zaranyika, M. F. Sources and levels of pollution along Mukuvisi River: A review. Harare: University of Zimbabwe Publications, 1997.