Comment on "Solubility Enhancement and Fluorescence Quenching of Pyrene by Humic Substances: The Effect of Dissolved Oxygen on Quenching Processes." (comment on K.M. Danielsen, et. al., Environmental Science & Technology, vol. 29, p. 2162, 1995)
Article Abstract:
Novel mechanisms such as the presence of humic or fulvic acids are not necessary in explaining the dynamic quenching of pyrene by oxygen in aqueous solution. Reasonable and ordinary mechanisms must first be ruled out before extraordinary mechanisms are proposed. No estimates of the reproducibility or precision of data gathered under 'air-saturated' conditions were likewise offered in basing conclusions on the difference in pyrene fluorescence lifetime in the absence and presence of SRFA in aerated solutions. There was no indication on the preparation and maintenance of air-equilibrated solutions, nor the control of the temperature throughout the experiments.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Response of aluminum solubility to elevated nitrification in soil of a red spruce stand in eastern Maine
Article Abstract:
The effects of pH and organic matter on the solubility of aluminum in forest soils are modified by nitrification, stimulated by the addition of (NH4)2SO4. This was gleaned from an evaluation of Al solubility in two red spruce stands in eastern Maine, with soil samples collected on five occasions from 1992 to 1995. The elevation of nitrification through the treatment of dry (NH4)2SO4 to one of the spruce stands caused an increase im acid input, which led to inorganic Al concentrations higher than 60 (micro)mol L(super -1) in both the Oa and Bh soil horizons.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Photochemical formation of hydroxyl radical by constituents of natural waters
Article Abstract:
A novel method for quantifying the photochemical rate of hydroxyl radical (OH) formation in aqueous solution was developed in order to cover aerobic and anaerobic conditions. The proposed method, when applied to the photolysis of Suwanne River, generated quantum yields comparable to previously-accepted levels. Although the OH formation rate for aerobic settings was slightly higher than that gathered from anaerobic system, the presence of a dioxygen-independent pathway for hydroxyl/nitrate photolysis was confirmed..
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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