Effect and Mechanism of Bicarbonate Ion on Lead Absorption in Pontederia crassipes from Karst Water
The molarity of HCO3− in karst water played a vital role in regulating the functional group when Pontederia crassipes combined with Pb. Different kinds of functional groups worked in the Pb uptake by Pontederia crassipes; moreover, the same functional group in the Pontederia crassipes root from karst water at different HCO3− molarities worked distinctly (i.e., SO42−, C≡C, and protein C=O). Alcoholic hydroxyl in the Pontederia crassipes root had no significant effect on the increase in HCO3− molarities in karst water. Protein C=O on the cell wall was the most effective when the molarity of HCO3− was 4 mmol/L. A high molarity of HCO3− in karst water promoted the bonding between –CH3 and Pb and the methyl transfer reaction, which relieved the Pb toxicity to the Pontederia crassipes morphology.
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