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Uptake and speciation of zinc in edible plants grown in smelter contaminated soils

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [4];  [5]
  1. University of Leeds (United Kingdom); Illinois Institute of Technology, Chicago, IL (United States)
  2. West Virginia Univ., Morgantown, WV (United States)
  3. OP Jindal Global University, Sonipat (India)
  4. Univ. of Chicago, IL (United States)
  5. Princeton Univ., NJ (United States)
Heavy metal accumulation in edible plants grown in contaminated soils poses a major environmental risk to humans and grazing animals. This study focused on the concentration and speciation of Zn in different edible plants grown in soils contaminated with smelter wastes (Spelter, WV, USA) containing high levels of the metals Zn, Cu, Pb, Cd. Their accumulation was examined in different parts (roots, stem, and leaves) of plants and as a function of growth stage (dry seed, sprouting seed, cotyledon, and leaves) in the root vegetables radish, the leafy vegetable spinach and the legume clover. Although the accumulation of metals varied significantly with plant species, the average metal concentrations were [Zn] > [Pb] > [Cu] > [Cd]. Metal uptake studies were complemented with bulk and micro X-ray absorption spectroscopy (XAS) at Zn K-edge and micro X-ray fluorescence (μXRF) measurements to evaluate the speciation and distribution of Zn in these plant species. Dynamic interplay between the histidine and malate complexation of Zn was observed in all plant species. XRF mapping of spinach leaves at micron spatial resolution demonstrated the accumulation of Zn in vacuoles and leaf tips. Radish root showed accumulation of Zn in root hairs, likely as ZnS nanoparticles. At locations of high Zn concentration in spinach leaves, μXANES suggests Zn complexation with histidine, as opposed to malate in the bulk leaf. These findings shed new light on the dynamic nature of Zn speciation in plants.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-98CH10886; FC09-96SR18546; FG02-92ER14244; SC0012704
OSTI ID:
1745051
Alternate ID(s):
OSTI ID: 1783932
Report Number(s):
BNL-221463-2021-JACI
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 4 Vol. 15; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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