Relationship of bioaccessibility and fractionation of cadmium in long-term spiked soils for health risk assessment based on four in vitro gastrointestinal simulation models

Tang, Wenzhong, Xia, Qing, Shan, Baoqing and Ng, Jack C. (2018) Relationship of bioaccessibility and fractionation of cadmium in long-term spiked soils for health risk assessment based on four in vitro gastrointestinal simulation models. Science of the Total Environment, 631-632 1582-1589. doi:10.1016/j.scitotenv.2018.03.154


Author Tang, Wenzhong
Xia, Qing
Shan, Baoqing
Ng, Jack C.
Title Relationship of bioaccessibility and fractionation of cadmium in long-term spiked soils for health risk assessment based on four in vitro gastrointestinal simulation models
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 1879-1026
0048-9697
Publication date 2018-03-28
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2018.03.154
Open Access Status Not yet assessed
Volume 631-632
Start page 1582
End page 1589
Total pages 8
Place of publication Amsterdam, NX Netherlands
Publisher Elsevier
Language eng
Subject 2305 Environmental Engineering
2304 Environmental Chemistry
2311 Waste Management and Disposal
2310 Pollution
Abstract The bioavailability and bioaccessibility of heavy metals mainly depend on their speciation in soils; however, the relationship between bioaccessibility and its speciation as determined as fractionation remains to be better characterized. Therefore, Cd fractionations in three types of long-term Cd-spiked soils were determined using a modified BCR method, and compared with Cd bioaccessibility data obtained from four in vitro gastrointestinal simulation assays including the IVG, PBET, SBRC, and UBM. The results shows that the majority of Cd were found in the exchangeable/acid soluble (B1) and reducible (B2) fractions (total percentage > 97%) after being spiked and aged for three years, indicating high Cd bioavailability; the bioaccessibility of Cd ranged from 57.7 ± 1.8% to 99.3 ± 2.8% in the gastric phase, and from 5.8 ± 2.0% to 35.9 ± 1.8% in the intestinal phase, respectively. Among the four assays, the strongest positive correlation was observed between Cd bioaccessibility based on the PBET assay and its B1 fraction in the spiked soils (r gastric: 0.62 and intestinal: 0.52), suggesting that the PBET assay maybe more suitable for determining Cd bioaccessibility in aged contaminated soils.
Keyword Bioaccessibility
Bioavailability
Heavy metal
Soil contamination
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 2017059
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Queensland Alliance for Environmental Health Sciences (QAEHS) Publications
 
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Created: Thu, 05 Apr 2018, 22:46:59 EST