Hydrogen peroxide distribution, production, and decay in boreal lakes
Hydrogen peroxide distribution, production, and decay in boreal lakes
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DOI：
10.1139/f04-098
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发表时间：
2004-08-01
影响因子：
2.4
通讯作者：
Granéli, W
中科院分区：
文献类型：
--
作者：
Häkkinen, PJ;Anesio, AM;Granéli, W
研究了10个不同理化性质的北方湖泊中过氧化氢(H_2O_2)的分布、产生和衰变。通过在六个深度每天三次采样，跟踪了这些湖泊中过氧化氢浓度的日变化和垂直变化。此外，通过0.2亩滤网过滤的水在人工照射下进行培养，以研究非生物产生和衰减过氧化氢的情况。人工辐照8h后的H_2O_2浓度与320 nm处的吸收系数及溶解有机碳(DOC)浓度均无显著相关性。然而，在DOC浓度低于10mg.L-1的湖泊中，H_2O_2浓度随着DOC浓度的增加而迅速增加。紫外线照射后的H_2O_2浓度与H_2O_2半衰期呈正相关，而H_2O_2半衰期与铁、锰浓度呈负相关(r(2)分别为0.68和0.70)。现场水柱表面的H_2O_2浓度在30~1041nmol.L~(-1)之间，很大程度上取决于H_2O_2的衰减速率和水柱的混合深度。
The distribution, production, and decay of hydrogen peroxide (H2O2) were studied in 10 boreal lakes of differing physical-chemical characteristics. Diurnal and vertical fluctuations in H2O2 concentration were followed in the lakes by sampling at six depths three times per day. In addition, incubations of water filtered through 0.2-mu mesh were made under artificial irradiation to study the abiotic production and decay of H2O2. H2O2 concentrations after 8 h of artificial irradiation were significantly correlated with neither absorption coefficients at 320 nm nor with dissolved organic carbon (DOC) concentrations. However, H2O2 concentration increased rapidly with DOC concentration among lakes with DOC concentrations below 10 mg.L-1. The H2O2 concentration after exposure to ultraviolet radiation was positively related to the half-life of H2O2, which in turn was negatively correlated with iron and manganese concentrations (r(2) = 0.68 and 0.70, respectively). In situ H2O2 concentrations at the surface of the water column ranged between 30 and 1041 nmol.L-1 and were largely determined by the decay rates of H2O2 and the mixing depth of the water column.