Effect of Groundwater Components on Hydroxyl Radical Production by Fe (II) Oxygenation
Zhou Fan
Zhu Jian
Zhang Peng
Yuan Songhu
Abstract：Hydroxyl radical (·OH) is the most reactive oxidant in nature, which significantly impacts the transformation of substance and contaminants.Previous studies have substantiated that exposure of groundwater to O2 can produce ·OH through Fe2+ oxygenation.However, the effect of groundwater compositions on Fe2+ oxygenation and ·OH production remainsis unclear.Therefore, this study evaluates the influence of groundwater components (Ca2+, Mg2+, humic acid (HA) and phosphate) on Fe2+ oxygenation and resultant ·OH production.Results show that at pH 6.5, 0.357 mM Fe2+ was completely oxidized within 5h with production of 1.8μM ·OH.Ca2+ (1-6mM) and Mg2+ (1-4mM) had no obvious influence on Fe2+ oxidation and ·OH production.HA (10-30mg/L) promoted Fe2+ oxidation and ·OH production, and the promotion increased with the decrease in pH.Phosphate (0.01-0.03mM) inhibited Fe2+ oxidation and ·OH production in initial stage while promoted Fe2+ oxidation and ·OH production later on.
Keywords：ferrous ironhydroxyl radicalgroundwateroxygenationhydrogeochemistry
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1039-1044 )