Photoproduction of Dissolved Inorganic Carbon from Suwannee River Humic Acid

doi:10.7517/j.issn.1674-0475.2007.06.431

Abstract

Abstract: The photochemical mineralization of dissolved organic carbon to dissolved inorganic carbon (DIC) is a key process in carbon cycling.Suwannee river humic acid was photooxidated using a Suntest CPS solar simulator to examine the effects of dissolved oxygen levels,the wavelength of incident light and the concentration of Fe on the photoproduction of DIC.Based on the rate of DIC photoproduction under air-saturation in the first 24 h (4.40 μmol/ (L·h)),it increased by a factor of 1.56 under O₂-saturation,but fell by only 36% under N₂-saturation.UV-B,UV-A and visible wavelengths accounted for 31.8,32.6 and 25.6% respectively of DIC production.As 20 μmol/L DFOM added,the rate of DIC photoproduction was 55.6% of that of original Suwannee river humic acid samples with 5.46 μmol/L Fe.

Key words: DIC, humic acid, photochemistry, iron

CLC Number:

LOU Tao, WANG Xue-jun, XU Shao-hui, ZHANG Hui. Photoproduction of Dissolved Inorganic Carbon from Suwannee River Humic Acid[J]. Imaging Science and Photochemistry, 2007, 25(6): 431-435.

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Photoproduction of Dissolved Inorganic Carbon from Suwannee River Humic Acid

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