DOI: 10.1139/f05-009. Photodegradation-induced changes in dissolved organic matter in acidic waters

Photodegradation-induced changes in dissolved organic matter in acidic waters

10.1139/f05-009

Crossref journal-article

Canadian Science Publishing

Canadian Journal of Fisheries and Aquatic Sciences (155)

Abstract

Photodegradation of dissolved organic matter (DOM) from stream waters was investigated using dissolved organic carbon (DOC) analysis, ultraviolet-visible absorbance, three-dimensional excitational emission matrix fluorescence, and high-performance size exclusion chromatography. The effects of altering pH and various iron concentrations on DOM characteristics during irradiation were examined. DOC concentration, absorbance, and fluorescence all decreased with increasing irradiation. These decreases were accompanied by a decrease in absorbance spectral slope and average molecular size and a blue-shift in fluorescence maximum; decreasing pH enhanced these changes. The photooxidation rate constants were wavelength dependent. For the ratio of the photooxidation rate constant at pH 4 to that at pH 8 under ultraviolet irradiation, there were two maxima at wavelengths of approximately 280 and 320 nm, respectively, indicating that aromatic fractions were most pH photosensitive. The isolated humic acid (HA) and fulvic acid (FA) fractions had different photodegradation characteristics in terms of the photooxidation rate constant and the effects of pH and iron. The results suggest that iron played a more significant role in the photodegradation of the HA fraction than that of the FA fraction and that the HA fraction was mainly responsible for the observed DOM photodegradation. The results indicate that DOM photodegradation in stream waters is strongly influenced by iron and acidity.

Bibliography

Wu, F. C., Mills, R. B., Cai, Y. R., Evans, R. D., & Dillon, P. J. (2005). Photodegradation-induced changes in dissolved organic matter in acidic waters. Canadian Journal of Fisheries and Aquatic Sciences, 62(5), 1019â1027.

Authors 5

F C Wu (first)
R B Mills (additional)
Y R Cai (additional)
R D Evans (additional)
P J Dillon (additional)

References 31 Referenced 38

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Dates

Type	When
Created	20 years, 2 months ago (June 2, 2005, 11:45 a.m.)
Deposited	5 years, 7 months ago (Jan. 5, 2020, 8:04 a.m.)
Indexed	1 year, 5 months ago (Feb. 29, 2024, 9:18 p.m.)
Issued	20 years, 3 months ago (May 1, 2005)
Published	20 years, 3 months ago (May 1, 2005)
Published Print	20 years, 3 months ago (May 1, 2005)

Funders 0

None

BibTeX

@article{Wu_2005, title={Photodegradation-induced changes in dissolved organic matter in acidic waters}, volume={62}, ISSN={1205-7533}, url={http://dx.doi.org/10.1139/f05-009}, DOI={10.1139/f05-009}, number={5}, journal={Canadian Journal of Fisheries and Aquatic Sciences}, publisher={Canadian Science Publishing}, author={Wu, F C and Mills, R B and Cai, Y R and Evans, R D and Dillon, P J}, year={2005}, month=may, pages={1019–1027} }

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