Trace metals in soil and vegetables and associated health risk assessment

Environ Monit Assess. 2014 Dec;186(12):8727-39. doi: 10.1007/s10661-014-4040-y. Epub 2014 Sep 11.

Abstract

The objective of this study was to assess the contamination level of trace metals in soil and vegetables and health risk to the urban population in Bangladesh. The range of Cr, Ni, Cu, As, Cd, and Pb in agricultural soils was 158-1160, 104-443, 157-519, 41-93, 3.9-13, and 84-574 mg/kg, respectively. Sequential extraction tests revealed that the studied metals were predominantly associated with the residual fraction, followed by the organically bound phase. Concerning Cu, Ni, Cd, and Pb in vegetables, more than 50 % samples exceeded the FAO/WHO recommended permissible limits. Considering the transfer of metals from soil to vegetables, Cu and Cd exhibited higher transfer factor (TF) values than the other metals. Target hazard quotient (THQ) for individual metal was below 1, suggesting that people would not experience significant health hazards if they ingest a single metal from vegetables. However, total metal THQ signifies the potential non-carcinogenic health hazard to the highly exposed consumers. The carcinogenic risk (TR) of As (1.9 × 10(-4)) and Pb (2.3 × 10(-5)) through consumption of vegetables were higher than the USEPA threshold level (10(-6)), indicating potential cancer risks.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bangladesh
  • Environmental Exposure / statistics & numerical data*
  • Environmental Monitoring
  • Humans
  • Metals, Heavy / analysis*
  • Risk
  • Risk Assessment
  • Soil / chemistry*
  • Soil Pollutants / analysis*
  • Vegetables / chemistry*
  • Vegetables / metabolism

Substances

  • Metals, Heavy
  • Soil
  • Soil Pollutants