Evaluation of chromium bioaccessibility in chromite ore processing residue using in vitro gastrointestinal method

► Cr bioaccessibility from COPR determined using in vitro gastrointestinal extraction. ► Extent of Cr(VI) reduction varies with the presence of particular organic acids. ► Foodstuffs facilitate Cr(VI) reduction as evidenced by XANES and XRPD analysis. ► Cr(VI) present for periods of time during the digestion process. ► Area under concentrations-time curve integration improves bioaccessibility accuracy.