Effect of Groundwater Components on Hydroxyl Radical Production by Fe (Ⅱ) Oxygenation
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摘要: 羟自由基(·OH)是自然环境中氧化活性最强的物种，对物质转化具有重要影响.前期研究发现地下水接触O2可产生·OH，其中Fe2+氧化起主导作用，但地下水化学组成对Fe2+氧化产生·OH的影响尚不清楚.通过室内模拟实验，探究了地下水中常见组分(Ca2+、Mg2+、腐殖酸(HA)和磷酸根)对Fe2+氧化产生·OH的影响.结果表明，pH 6.5时0.357 mM Fe2+在5 h内氧化完全，产生约1.8 μM的·OH；Ca2+(1~6 mM)、Mg2+(1~4 mM)对Fe2+氧化和·OH产生无明显影响；HA(10~30 mg/L)促进Fe2+氧化和·OH产生，促进效果随pH降低而增强；磷酸根(0.01~0.03 mM)抑制Fe2+氧化，对·OH产生的影响为先抑制后促进.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 5 h with production of 1.8 μM ·OH. Ca2+ (1-6 mM) and Mg2+ (1-4 mM) had no obvious influence on Fe2+ oxidation and ·OH production. HA (10-30 mg/L) promoted Fe2+ oxidation and ·OH production, and the promotion increased with the decrease in pH. Phosphate (0.01-0.03 mM) inhibited Fe2+ oxidation and ·OH production in initial stage while promoted Fe2+ oxidation and ·OH production later on.
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Key words:
- ferrous iron /
- hydroxyl radical /
- groundwater /
- oxygenation /
- hydrogeochemistry
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图 1 Ca2+对Fe2+氧化(a)和羟自由基产量(b)的影响，Mg2+对Fe2+氧化(c)和羟自由基产量(d)的影响
Fig. 1. Effects of Ca2+ on Fe2+ oxidation (a) and ·OH production (b), and of Mg2+ on Fe2+ oxidation (c) and ·OH production (d)
图 2 HA在pH6.5时对Fe2+氧化(a)和对羟自由基产量(b)的影响
Fig. 2. Effect of HA on Fe2+ oxidation (a) and ·OH production (b) at pH 6.5
图 3 HA在pH6.2时对Fe2+氧化(a)和对羟自由基产量(b)的影响
Fig. 3. Effect of HA on Fe2+ oxidation (a) and ·OH production (b) at pH 6.2
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