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Pandi, Sudarsana Rao
- Characterization of Humic Substances and their Distribution of XAD Fractions by Absorption Spectroscopy in the Godavari Estuary, India
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Authors
Affiliations
1 Marine Chemistry Laboratory, School of Chemistry, Andhra University, Visakhapatnam 530 003, IN
1 Marine Chemistry Laboratory, School of Chemistry, Andhra University, Visakhapatnam 530 003, IN
Source
Current Science, Vol 113, No 02 (2017), Pagination: 299-303Abstract
Humic substances (HS) are formed in estuarine regions by biogeochemical processes of terrestrial and in situ produced organic matters. Their structure and distribution may vary seasonally and spatially. To examine this, HS were isolated from Godavari estuarine waters using ion-exchange resins XAD-8 followed by XAD-4 during 2014-2015. The structural differences between the two fractions were characterized by E2/E3 ratio (α250/α365), spectral slope (S275-295), and spectral slope ratio (SR, S275-295/S350-400), which were derived from UV-visible absorbance spectra. Lower values of E2/E3 ratio, S275-295 and SR for XAD-8 fractions than XAD-4, indicate higher aromaticity and higher molecular weight of dissolved organic compounds retained on the former resin. The E2/E3 ratio for XAD-8 and SR for XAD-4 fractions were found to decrease gradually from post-monsoon to monsoon, indicating that the biological process controls the production of organic matter in upstream waters. Lower molecular weight organic compounds formed by bacterial decay and photodegradation during pre-monsoon and higher molecular weight organic compounds formed during the post-monsoon season was attributed to the freshly exudated organic matter from phytoplanktons dominated at the mouth of the estuary.Keywords
Absorbance Spectra, E2/E3 Ratio, Godavari Estuary, Humic Substances, Spectral Slope Ratio.Full Text
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- Spectral Modelling of Estuarine Coloured Dissolved Organic Matter
Abstract Views :288 |
PDF Views:78
Authors
Nittala S. Sarma
1,
Sudarsana Rao Pandi
1,
N. V. H. K. Chari
1,
Gundala Chiranjeevulu
1,
Rayaprolu Kiran
1,
K. Shiva Krishna
1,
D. Bhaskara Rao
1,
P. Venkatesh
1,
B. Charan Kumar
2,
A. V. Raman
2
Affiliations
1 Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, IN
2 Marine Biological Laboratory, Andhra University, Visakhapatnam 530 003, IN
1 Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, IN
2 Marine Biological Laboratory, Andhra University, Visakhapatnam 530 003, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1762-1767Abstract
Measuring coloured dissolved organic matter (CDOM) holds advantage over dissolved organic carbon (DOC) determination, as it can be remotely estimated unlike the latter, for which it can potentially act as a proxy. The CDOM absorbance, by definition, falls exponentially with wavelength of light (λ) in the ultravioletvisible region. Investigating over 800 absorption spectra of water samples from the tropical monsoonal Godavari estuary and the Chilika brackish water lagoon, we found that the spectral slope (S) of the 330–440 nm region (S330–440) is best suited to retrieve CDOM and its exponential character.Keywords
CDOM, Chilika Lagoon, Godavari Estuary, Spectral Slope, S330–440, UV-Visible Absorbance.Full Text
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