Mechanisms of Uptake and Translocation of Thallium in Brassica Vegetables: An X-ray Fluorescence Microspectroscopic Investigation

• DOI: 10.1021/acs.est.3c08113
• Publication Date: 2024-01-25T23:13:57Z
• Authors: Amelia Corzo-Remigio; Hugh H. Harris; Clinton J. Kidman; Philip Nti Nkrumah; Lachlan W. Casey; David J. Paterson; Mansour Edraki; Antony van der Ent
• Keywords: XANES

Most nonoccupational human exposure to thallium (Tl) occurs via consumption of contaminated food crops. Brassica cultivars are common crops that can accumulate more than 500 μg Tl g–1. Knowledge uptake and translocation mechanisms in is fundamental developing methods inhibit or conversely for potential use phytoremediation polluted soils. (25 total) were subjected dosing screen accumulation. Seven high Tl-accumulating varieties selected follow-up experiments. The highest accumulating analyzed by synchrotron-based micro-X-ray fluorescence investigate the distribution X-ray absorption near-edge structure spectroscopy (XANES) unravel chemical speciation. exhibited different tolerance accumulation patterns with some reaching up 8300 factors all >1 oleracea var. acephala (kale) having factor 167. In this cultivar, preferentially localized venules toward apex along foliar margins minute hot spots leaf blade. This study revealed through scanning electron microscopy analysis highly Tl-enriched crystals occur stoma openings leaves. finding further validated XANES spectra show Tl(I) dominates aqueous as well solid form. these has important implications safety results help understand