scholarly journals Bulk optical characterization of dissolved organic matter from semiarid wheat-based cropping systems

Geoderma ◽  
2017 ◽  
Vol 306 ◽  
pp. 40-49 ◽  
Author(s):  
Carlos M. Romero ◽  
Richard E. Engel ◽  
Juliana D'Andrilli ◽  
Chengci Chen ◽  
Catherine Zabinski ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Cropping Systems ◽  
Optical Characterization

Structural and optical characterization of dissolved organic matter from the lower Athabasca River, Canada

Chemosphere ◽  
2012 ◽  
Vol 87 (8) ◽  
pp. 932-937 ◽  
Author(s):  
Céline Guéguen ◽  
Darcy C. Burns ◽  
Alison McDonald ◽  
Brooke Ring
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Optical Characterization ◽  
Athabasca River

scholarly journals The optical characterization of chromophoric dissolved organic matter using wavelength distribution of absorption spectral slopes

2009 ◽  
Vol 54 (2) ◽  
pp. 590-597 ◽  
Author(s):  
Steven A. Loiselle ◽  
Luca Bracchini ◽  
Arduino M. Dattilo ◽  
Maso Ricci ◽  
Antonio Tognazzi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Optical Characterization ◽  
Chromophoric Dissolved Organic Matter ◽  
Wavelength Distribution

scholarly journals Contrasting the Optical Characterization of Dissolved Organic Matter in Water and Sediment from a Nascent River-Type Lake (Chongqing, China)

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 70
Author(s):  
Fengxia Niu ◽  
Fangying Ji ◽  
Qian Zhang ◽  
Qiushi Shen
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Sensitivity ◽  
Optical Characterization ◽  
Pore Waters ◽  
Overlying Water ◽  
Fluorescent Intensity ◽  
Water And Sediment ◽  
Doc Flux

Carbon cycling in rivers is altered by the creation of impoundments through dam construction. This paper seeks to identify the source and composition of dissolved organic matter (DOM) in both water and sediment in Lake Longjing by contrasting the optical characterization of DOM. By comparing the dissolved organic carbon (DOC) concentrations, we show that the sediment (53.7 ± 16.6 mg/L) acts as a DOC source to the overlying water (23.1 ± 1.4 mg/L). The estimated DOC flux in the original reservoir region (88.3 mg m−2 d−1) is higher than that in the newly submerged region (26 mg m−2 d−1), whereas the latter has larger contribution to the DOC annual load because of its larger sediment area. Spectroscopic analysis suggested that pore waters had higher aromaticity and lower proportion of fresh DOM than those in surface waters and benthic overlying waters. Through Parallel Factor Analysis, four fluorescent components were identified, i.e., two terrestrial humic-like components, one protein-like, and one microbial humic-like. Spearman correlation and Non-Metric-Multidimensional Scaling (NMDS) analysis manifested that fluorescent DOM in surface sediments is mainly contributed by autochthonous source, the others by allochthonous source. Due to the high sensitivity of the fluorescent intensity of the protein-like component, it is a useful indicator to reveal the changes of source of DOM.

scholarly journals Optical characterization of chromophoric dissolved organic matter at eutrophic and oligotrophic parts of a semi-enclosed bay (İzmir, Aegean Sea)

2021 ◽  
Vol 38 (2) ◽  
pp. 199-210
Author(s):  
Hakan Alyürük ◽  
Aynur Kontaş
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Rank Correlation ◽  
Correlation Coefficients ◽  
Aegean Sea ◽  
Optical Characterization ◽  
Chromophoric Dissolved Organic Matter ◽  
Izmir Bay ◽  
Spearman’S Rank Correlation

Optical characterization of chromophoric dissolved organic matter (CDOM) from İzmir Bay (Aegean Sea) waters was investigated. For sampling, surface and subsurface seawater from 7 stations were collected in summer 2015. Excitation-emission matrix (EEM) spectra of each sample were recorded on a fluorescence spectrophotometer. The results showed that dissolved organic carbon (DOC) concentrations and EEM peaks were increased from the outer bay to inner bay stations. EEM peaks indicated the presence of both humic-like and protein-like components which were higher at middle-inner bays than outer bay. Spearman’s rank correlation coefficients for EEM peak intensities and DOC concentrations were highly positive (p<0.05). HIX found between 0.73-3.51, whereas BIX ranged from 0.31 to 0.96 in the bay. Humification degree of CDOM in the middle-inner bays were higher compared to outer bay stations. High HIX values in the middle-inner bays could be linked to the presence of Melez stream (heavily polluted), other streams, rain run-offs and maritime activities at İzmir Bay. High BIX values in the middle-inner bays indicated presence of freshly produced DOM from bacterial origin. Optical characterization of CDOM could be used for tracing fluorescent DOM components and determining different DOM sources (autochthonous or allochthonous) in further studies.

Sign in / Sign up

Export Citation Format

Share Document