ISSN:
1420-9055
Keywords:
POM
;
POC
;
UV-spectra
;
nitrogen/carbon ratio
;
organic carbon cycle
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Ultraviolet (UV) spectra were measured to characterize the dissolved and particulate organic matter in a bog and to investigate the seasonal fluctuation of this organic matter. The optical density spectra in the UV region of dissolved organic matter (DOM) were proportional toλ −4, whereλ is the wavelength of incident light. There was also small absorption on theλ −4 spectra. The optical density at a wavelength of 280 nm was proportional to the concentration of dissolved organic carbon (DOC). The spectra and the dependency of optical density on DOC did not vary throughout the investigation period. The UV spectra of acid extractions of particulate organic matter (POM) showed two absorption peaks at the wavelengths of 220 nm and 335 nm. These peaks are well represented by the sum of two Lorentz functions. The ratio of the absorbances,A 280/A 335, was dependent on the nitrogen/carbon ratio of POM and the chlorophyll fraction in particulate organic carbon (POC), and not dependent on POC itself. The dependency of POC absorption at 280 nm varied with this ratio which fluctuated seasonally.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00877109
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