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- W2014580703 abstract "In zerovalent iron treatment systems, the presence of multiple solution components may impose combined effects that differ from corresponding individual effects. The copresence of humic acid and hardness (Ca2+/Mg2+) was found to influence Cr(VI) reduction by Fe0 and iron dissolution in a way different from their respective presence in batch kinetics experiments with synthetic groundwater at initial pH 6 and 9.5. Cr(VI) reduction rate constants (kobs) were slightly inhibited by humic acid adsorption on iron filings (decreases of 7–9% and 10–12% in the presence of humic acid alone and together with hardness, respectively). The total amount of dissolved Fe steadily increased to 25 mg L−1 in the presence of humic acid alone because the formation of soluble Fe−humate complexes appeared to suppress iron precipitation. Substantial amounts of soluble and colloidal Fe−humate complexes in groundwater may arouse aesthetic and safety concerns in groundwater use. In contrast, the coexistence of humic acid and Ca2+/Mg2+ significantly promoted aggregation of humic acid and metal hydrolyzed species, as indicated by XPS and TEM analyses, which remained nondissolved (>0.45 µm) in solution. These metal−humate aggregates may impose long-term impacts on PRBs in subsurface settings." @default.
- W2014580703 created "2016-06-24" @default.
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- W2014580703 date "2008-02-09" @default.
- W2014580703 modified "2023-10-03" @default.
- W2014580703 title "Chromium(VI) Reduction Kinetics by Zero-Valent Iron in Moderately Hard Water with Humic Acid: Iron Dissolution and Humic Acid Adsorption" @default.
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- W2014580703 doi "https://doi.org/10.1021/es072059c" @default.
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