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Hydrogen peroxide distribution, production, and decay in boreal lakes

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Abstract:

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-µ 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 (r2 = 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.

Nous avons étudié la répartition, la production et la décomposition du peroxyde d'hydrogène (H2O2) dans 10 lacs de la région boréale qui possèdent des caractéristiques physicochimiques différentes. Nous avons fait des prélèvements à six profondeurs, trois fois par jour, dans les lacs afin de suivre les fluctuations journalières et verticales des concentrations d'H2O2. De plus, nous avons incubé de l'eau filtrée sur un filtre de 0,2 µ sous irradiation artificielle afin d'observer la production et la décomposition abiotiques d'H2O2. Après 8 h d'incubation sous irradiation artificielle, il n'y a pas de corrélation significative entre les concentrations d'H2O2 et les coefficients d'absorption à 320 nm, ni entre ces concentrations et le carbone organique dissous (DOC). Cependant, les concentrations d'H2O2 augmentent rapidement en fonction de DOC dans les lacs qui ont des concentrations de DOC inférieures à 10 mg·L–1. Après une exposition à le rayonnement ultraviolet, la concentration d'H2O2 est en corrélation positive avec la demi-vie d'H2O2, qui, à son tour, est en corrélation négative avec le fer et manganèse (r2 = 0,68 et 0,70, respectivement). Les concentrations d'H2O2 in situ en surface de la colonne d'eau varient de 30 à 1041 nmol·L–1 et s'expliquent en grande partie par les taux de décomposition d'H2O2 et la profondeur du brassage dans la colonne d'eau.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2004-08-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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