Assessment of bioaccessibility and exposure risk of arsenic and lead in urban soils of Guangzhou City, China

Lu, Ying, Yin, Wei, Huang, Longbin, Zhang, Ganlin and Zhao, Yuguo (2011) Assessment of bioaccessibility and exposure risk of arsenic and lead in urban soils of Guangzhou City, China. Environmental Geochemistry and Health, 33 2: 93-102. doi:10.1007/s10653-010-9324-8

Author Lu, Ying
Yin, Wei
Huang, Longbin
Zhang, Ganlin
Zhao, Yuguo
Title Assessment of bioaccessibility and exposure risk of arsenic and lead in urban soils of Guangzhou City, China
Journal name Environmental Geochemistry and Health   Check publisher's open access policy
ISSN 0269-4042
Publication date 2011-04
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s10653-010-9324-8
Volume 33
Issue 2
Start page 93
End page 102
Total pages 10
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2011
Language eng
Formatted abstract
Soil ingestion is an important human exposure pathway of heavy metals in urban environments with heavy metal contaminated soils. This study aims to assess potential health risks of heavy metals in soils sampled from an urban environment where high frequency of human exposure may be present. A bioaccessibility test is used, which is an in vitro gastrointestinal (IVG) test of soluble metals under simulated physiological conditions of the human digestion system. Soil samples for assessing the oral bioaccessibility of arsenic (As) and lead (Pb) were collected from a diverse range of different land uses, including urban parks, roadsides, industrial sites and residential areas in Guangzhou City, China. The soil samples contained a wide range of total As (10.2 to 61.0 mg kg−1) and Pb (38.4 to 348 mg kg−1) concentrations. The bioaccessibility of As and Pb in the soil samples were 11.3 and 39.1% in the stomach phase, and 1.9 and 6.9% in the intestinal phase, respectively. The As and Pb bioaccessibility in the small intestinal phase was significantly lower than those in the gastric phase. Arsenic bioaccessibility was closely influenced by soil pH and organic matter content (r 2 = 0.451, p < 0.01) in the stomach phase, and by organic matter, silt and total As contents (r 2 = 0.604, p < 0.001) in the intestinal phase. The general risk of As and Pb intake for children from incidental ingestion of soils is low, compared to their maximum doses, without causing negative human health effects. The exposure risk of Pb in the soils ranked in the order of: industrial area/urban parks > residential area/road side. Although the risk of heavy metal exposure from direct ingestion of urban soils is relatively low, the risk of inhalation of fine soil particulates in the air remains to be evaluated.
© Springer
Keyword Arsenic
Oral bioaccessibility
Invitro test
Urban soil
Guangzhou (China)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 4 June 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2011 Collection
Sustainable Minerals Institute Publications
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 35 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 39 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 06 Sep 2010, 14:50:50 EST by Laurelle Elliott on behalf of Centre For Mined Land Rehabilitation