Abstract
We performed a risk assessment of metal exposure to population subgroups living on, and growing food on, urban sites. We modeled uptake of cadmium, copper, nickel, lead, and zinc for a selection of commonly grown allotment and garden vegetables. Generalized linear cross-validation showed that final predictions of Cd, Cu, Ni, and Zn content of food crops were satisfactory, whereas the Pb uptake models were less robust. We used predicted concentrations of metals in the vegetables to assess the risk of exposure to human populations from homegrown food sources. Risks from other exposure pathways (consumption of commercially produced foodstuffs, dust inhalation, and soil ingestion) were also estimated. These models were applied to a geochemical database of an urban conurbation in the West Midlands, United Kingdom. Risk, defined as a "hazard index," was mapped for three population subgroups: average person, highly exposed person, and the highly exposed infant (assumed to be a 2-year-old child). The results showed that food grown on 92% of the urban area presented minimal risk to the average person subgroup. However, more vulnerable population subgroups (highly exposed person and the highly exposed infant) were subject to hazard index values greater than unity. This study highlights the importance of site-specific risk assessment and the "suitable for use" approach to urban redevelopment.
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- Calabrese E. J., Stanek E. J., 3rd, Pekow P., Barnes R. M. Soil ingestion estimates for children residing on a superfund site. Ecotoxicol Environ Saf. 1997 Apr;36(3):258–268. doi: 10.1006/eesa.1996.1511. [DOI] [PubMed] [Google Scholar]
- Hawley J. K. Assessment of health risk from exposure to contaminated soil. Risk Anal. 1985 Dec;5(4):289–302. doi: 10.1111/j.1539-6924.1985.tb00185.x. [DOI] [PubMed] [Google Scholar]
- Hébert C. D., Elwell M. R., Travlos G. S., Fitz C. J., Bucher J. R. Subchronic toxicity of cupric sulfate administered in drinking water and feed to rats and mice. Fundam Appl Toxicol. 1993 Nov;21(4):461–475. doi: 10.1006/faat.1993.1122. [DOI] [PubMed] [Google Scholar]
- McKone T. E. Uncertainty and variability in human exposures to soil contaminants through home-grown food: a Monte Carlo assessment. Risk Anal. 1994 Aug;14(4):449–463. doi: 10.1111/j.1539-6924.1994.tb00263.x. [DOI] [PubMed] [Google Scholar]
- Mushak P., Davis J. M., Crocetti A. F., Grant L. D. Prenatal and postnatal effects of low-level lead exposure: integrated summary of a report to the U.S. Congress on childhood lead poisoning. Environ Res. 1989 Oct;50(1):11–36. doi: 10.1016/s0013-9351(89)80046-5. [DOI] [PubMed] [Google Scholar]
- Sánchez-Camazano M., Sánchez-Martín M. J., Lorenzo L. F. Lead and cadmium in soils and vegetables from urban gardens of Salamanca (Spain). Sci Total Environ. 1994 May 23;146-147:163–168. doi: 10.1016/0048-9697(94)90233-x. [DOI] [PubMed] [Google Scholar]
- Teuschler L. K., Dourson M. L., Stiteler W. M., McClure P., Tully H. Health risk above the reference dose for multiple chemicals. Regul Toxicol Pharmacol. 1999 Oct;30(2 Pt 2):S19–S26. doi: 10.1006/rtph.1999.1321. [DOI] [PubMed] [Google Scholar]
- Waalkes M. P., Rehm S. Cadmium and prostate cancer. J Toxicol Environ Health. 1994 Nov;43(3):251–269. doi: 10.1080/15287399409531920. [DOI] [PubMed] [Google Scholar]
- Yadrick M. K., Kenney M. A., Winterfeldt E. A. Iron, copper, and zinc status: response to supplementation with zinc or zinc and iron in adult females. Am J Clin Nutr. 1989 Jan;49(1):145–150. doi: 10.1093/ajcn/49.1.145. [DOI] [PubMed] [Google Scholar]