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Göteborgs universitets publikationer

Metal uptake by homegrown vegetables - The relative importance in human health risk assessments at contaminated sites

Författare och institution:
A. L. M. Augustsson (-); T. E. Uddh-Söderberg (-); Johan Hogmalm (Institutionen för geovetenskaper); M. E. M. Filipsson (-)
Publicerad i:
Environmental Research, 138 s. 181-190
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Risk assessments of contaminated land often involve the use of generic bioconcentration factors (BCFs), which express contaminant concentrations in edible plant parts as a function of the concentration in soil, in order to assess the risks associated with consumption of homegrown vegetables. This study aimed to quantify variability in BCFs and evaluate the implications of this variability for human exposure assessments, focusing on cadmium (Cd) and lead (Pb) in lettuce and potatoes sampled around 22 contaminated glassworks sites. In addition, risks associated with measured Cd and Pb concentrations in soil and vegetable samples were characterized and a probabilistic exposure assessment was conducted to estimate the likelihood of local residents exceeding tolerable daily intakes. The results show that concentrations in vegetables were only moderately elevated despite high concentrations in soil, and most samples complied with applicable foodstuff legislation. Still, the daily intake of Cd (but not Pb) was assessed to exceed toxicological thresholds for about a fifth of the study population. Bioconcentration factors were found to vary more than indicated by previous studies, but decreasing BCFs with increasing metal concentrations in the soil can explain why the calculated exposure is only moderately affected by the choice of BCF value when generic soil guideline values are exceeded and the risk may be unacceptable.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap ->
Miljövetenskap ->
Miljökemi ->
Tungmetaller och övriga metaller
Contaminated land; Exposure assessment; Metal uptake by homegrown vegetables; Risk assessment
Postens nummer:
Posten skapad:
2015-03-09 14:02
Posten ändrad:
2015-03-09 14:03

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