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Assessment of Lead Exposure in Thohoyandou, South Africa

Abstract

Lead levels in different environmental media (soil, grass leaves, water, ceramics, pencil, paint, crayons and cosmetics) were determined to assess the major sources of lead exposure in Thohoyandou, South Africa. Soil and plant leaves were used as indicators of Pb pollution from vehicle exhaust emissions. After digestion with concentrated acids (HNO3, HCl and HClO4) Pb concentrations were determined in triplicate using a flame atomic absorption spectrometer. The mean Pb concentrations at the kerb of selected busy roads were 205.5 ± 90, 273.0 ± 90 and 312.8 ± 81 μg g−1 and 154.7 ± 67, 182.9 ± 76 and 240.6 ± 66 μg g−1 for soil and plant leaves (dry weight) respectively. These concentrations were substantially higher than the values found on soils 50 m away from the roads (97.4 ± 11 μg g−1). Pb concentrations in plants collected further away from the road (50 m) were substantially lower (71.8 ± 9.0 μg g−1). The observed levels on soil are lower than the UK critical value of 500 μg g−1 for gardens and allotments; and 2000 μg g−1 for parks and open space as well as the Canadian values for agricultural (375 μg g−1), residential (500 μg g−1 and industrial (1000 μg g−1). From these data it was clear that Pb concentrations in soil samples were substantially higher than the levels obtained for plant leaves. The Pb levels in green crayons, blue crayons, pencils (from China & Germany), were 10650 ± 75.2, 8200 ± 52.4, 1160 ± 50.2, 79 ± 10.1 μg g−1 for the inner contents; and 4870 ± 58.1, 5650 ± 55.5, 1950 ± 46.6, 60 ± 12.9 μg g−1 for the outer surface paint respectively. The ceramics showed Pb levels of 630 ± 50.3 μg g−1 (saucer) and 560 ± 32.2 μg g−1 (cup), while the inner contents and outer surface paint showed 480 ± 32.4 and 318 ± 21.2 μg g−1 of Pb respectively. Early morning tap water flush gave a Pb level of 20.6 ± 5.6 μg Pb l−1. This value is higher than the WHO and FDA maximum permissible concentrations of 10 μg l−1 and 15 μg l−1 respectively.

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References

  • Alloway, B.J. and Ayres, D.C.: 1997, Chemical Principles of Environmental Pollution, 2nd ed., Blackie Academic & Professional, Glasgow, 190–209.

    Google Scholar 

  • ATSDR: 1990, ‘Toxicological Profile for Lead,’ ATSDR/TP-88/17, Atlanta, GA-Agency for Toxic Substances and Disease Registry.

  • Baghurst, P.A., MaMichael, A.J., Wigg, N.R., Vimpani, G.V., Robinson, E.F., Robers, R.J. and Tong, S.L.: 1992, ‘Environmental Exposure to Lead and Children’s Intelligence at the Age of Seven Years: The Port Pirie Cohort Study,’ N. Engl. J. Med. 327, 1279–1284.

    PubMed  Article  CAS  Google Scholar 

  • Barnes, R.M.: 1990, ‘Childhood Soil Ingestion: How much Dirt do Kids Eat?’ Anal. Chem. 62, 1023A–1033A.

    Article  PubMed  CAS  Google Scholar 

  • Bellinger, D., Levinton, A., Needleman, H.L., Waternaux, C. and Rabinowitz, M.: 1986, ‘Low-Level Lead Exposure and Infant Development in the First Year,’ Neurobehav. Toxicol. Teratol. 8, 151–161.

    PubMed  CAS  Google Scholar 

  • Canada Council of Ministers of the Environment: 1992, ‘Canadian Environmental Quality for Contaminated Sites,’ Report CCME EPC-C, Winnipeg, Manitoba.

  • DWAF: 1992, ‘Analytical Methods Mannual,’ TR 151, Department of Water Affairs & Forestry, Pretoria, South Africa.

  • Fergusson, J.E.: 1990, The Heavy Elements: Chemistry, Environmental Impact and Health Effects, Pergamon Press, Oxford.

    Google Scholar 

  • Grobler, S.R., Maresky, L.S. and Rossouw, R.J.: 1986, ‘Blood Lead Levels of South Africa Long Distance Road Runners,’ Arch. Environ. Health 41(3), 155–161.

    PubMed  Article  CAS  Google Scholar 

  • Hammond, B.P.: 1982, ‘Metabolism of Lead: Lead Absorption in Children,’ Management, Clinical and Environmental Aspect 11, 11–19.

    Google Scholar 

  • Harrison, R.M., Laxen, D.P.H. and Wilson, S.J.: 1981, ‘Chemical Association of Lead, Cadmium, Copper and Zinc in Street Dusts and Roadside Soils,’ Environmental Sciences & Technology 15(11), 1378–1383.

    CAS  Google Scholar 

  • Kloke, A., Sauerbeck, D.R. and Vetter, H., 1984: In Changing Metal Cycles and Human Health, (ed. J.O. Nriagu, (e.d.), Springer-Verlag, Berlin.

    Google Scholar 

  • Mathee, A., Schirnding, Y.E.R., Levin, J., Ismail, A., Huntley, R. and Cantrell, A.: 2002, ‘A Survey of Blood Lead Levels Among Young Johannesburg School Children,’ Environmental Research 90, 181–184.

    Article  PubMed  CAS  Google Scholar 

  • Mattee, T.D., Figueroa, S., Ostrowski, G., Burr, L., Jackson-Hunt, J.P. and Baker, E.L.: 1991, ‘Lead Exposure from Conventional and Cottage Lead Smelting in Jamaica,’ Arch. Environ. Contam. Toxicol 21, 65–71.

    Article  PubMed  Google Scholar 

  • Miller, J.C. and Miller, J.N.: 1998, Statistics for Analytical Chemistry, 2nd edn., Ellis Horword, Chichester, pp. 97–100.

    Google Scholar 

  • Mmaga, T.M. and Semu, E.: 1999, ‘Contents of Heavy Metals in Some Soils of the Morogoro Municipality, Tanzania, as a Result of Cottage-Scale Metal Working Operations,’ Intern. J. Environ. Studies 56, 373–383.

    Google Scholar 

  • Muňoz, I., Romieu, I., Palazuelos, E, Meneses, F., Mancilla-Sanchez, T., Meneses-Gonzalez, F. and Hernandez-Avila, M.: 1993, ‘Blood Lead Levels and Neurobehaviour Development Among Children Living in Mexico City,’ Arch Environ Health 48, 132–139.

    PubMed  Article  Google Scholar 

  • Packham, R.F.: 1996, In Pollution, Causes, Effects and Control, 3rd ed., (Roy M. Harrison ed.), The Royal Society of Chemistry, Cambridge, pp. 52–54.

    Google Scholar 

  • Romieu, I., Palazuelos, E., Avila, M.H., Rios, C., Muňoz, I., Jimenez, C. and Cahero, G.: 1995, ‘Sources of Lead Exposure in Mexico city,’ Environmental Perspectives 102(4), 384–389.

    Google Scholar 

  • Sedman, R.M.: 1989, ‘The Development of Applied Action Levels for Soil Contact: A Scenario for the Exposure of Humans to Soil in a Residential Setting,’ Environ. Health Perspect 79, 291–313.

    PubMed  CAS  Google Scholar 

  • South African Bureau of Standards Specification of Drinking Water: 1999, SABS, South Africa.

  • Schuhmacher, M., Domingo, J.L., Libet, J.M. and Corbella, J.: 1991, ‘Lead in Children’s Hair as Related to Exposure to Tarragona Province, Spain,’ The Science of Total Environment 104, 167–173.

    Article  CAS  Google Scholar 

  • UK Department of the Environment ICRCI.: 1987, ‘Trigger Concentrations for Environmental Metal Contaminants.’

  • US Food and Drug Administration, Drug bulletin: 1988, Lead in Ceramic Ware, Fisherlane Rockville.

    Google Scholar 

  • Van Wijnen, J.H., Clausing, P. and Brunekreef, B.: 1990, ‘Estimated Soil Ingestion by Children,’ Environ. Res. 51, 147–162.

    Article  PubMed  CAS  Google Scholar 

  • von Schirnding, Y.E.R., Fuggle, R.F. and Bradshaw, D.: 1991a, ‘Blood Lead Levels in South African Inner-City Children,’ Environ Health Perspective 94, 125–130.

    CAS  Google Scholar 

  • von Schirnding, Y.E.R., Fuggle, R.F. and Bradshaw, D.: 1991b, ‘Factors Associated with Elevated Blood Lead Levels in Inner-City Cape Town Children,’ South Afr. Med. J. 79, 454–456.

    CAS  Google Scholar 

  • WHO: 1996, ‘Guidelines for Drinking Water Quality. Health Criteria and Other Supporting Information,’ WHO, 254–275.

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Correspondence to Jonathan O. Okonkwo.

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Okonkwo, J.O., Maribe, F. Assessment of Lead Exposure in Thohoyandou, South Africa. Environmentalist 24, 171–178 (2004). https://doi.org/10.1007/s10669-005-6051-2

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Keywords

  • lead exposure
  • Thohoyandou
  • South Africa