Abstract
In-vitro digestion tests have been recently used to assess the health risk of oral ingestion of heavy metals from soils. These tests measure the solubility of soil heavy metals in simulated human digestive juice. Here we first introduce the origin, development and merits of the in-vitro digestion test, and related definitions and terms. We present the various procedures such as mouth, stomach and intestine; and effects of test parameters: soil particle size, temperature, mixing, pH, solid-to-liquid ratio, retention time, digestive compositions, food addition, analysis and calculation. We describe the six commonly used in-vitro digestion tests are (1) the physiologically-based extraction test (PBET), (2) the simple bioaccessibility extraction test (SBET), (3) the unified barge methods (UBM) from the bioaccessibility research group of Europe (BARGE), (4) the United States pharmacopeia methodology (USPM), (5) the in vitro gastrointestinal method (IVG) and (6) the diluted HCl solution test. We also review the effects of soil properties and ageing on bioaccessibility. We present the applications of in-vitro digestion test in soil metal pollution research with focus on remediation and bioaccessibility. The challenges of comparing results from in-vitro digestion test research are due to the differing extraction abilities of individual in-vitro digestion test; and the lack of regulation allowing operators to modify the composition and procedure of in-vitro digestion test.
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Li, Y., Demisie, W., Zhang, Mk. (2015). Digestion Tests to Measure Heavy Metal Bioavailability in Soils. In: Lichtfouse, E., Schwarzbauer, J., Robert, D. (eds) CO2 Sequestration, Biofuels and Depollution. Environmental Chemistry for a Sustainable World, vol 5. Springer, Cham. https://doi.org/10.1007/978-3-319-11906-9_7
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