Microbial and Dissolved Organic Carbon Characterization of Stormflow in the Santa Ana River at Imperial Highway, Southern California, 1999-2002

2004 ◽  
Author(s):  
John A. Izbicki ◽  
M. Isabel Pimentel ◽  
Menu Leddy ◽  
Brian A. Bergamaschi
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Southern California ◽  
Santa Ana ◽  
Santa Ana River

Concentration, UV-spectroscopic characteristics and fractionation of DOC in stormflow from an urban stream, Southern California, USA

2007 ◽  
Vol 4 (1) ◽  
pp. 35 ◽  
Author(s):  
John A. Izbicki ◽  
Isabel M. Pimentel ◽  
Russell Johnson ◽  
George R. Aiken ◽  
Jerry Leenheer
Keyword(s):  
Public Health ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Rainy Season ◽  
Health Issues ◽  
Santa Ana ◽  
Public Supply ◽  
Tributary Stream ◽  
Unknown Composition ◽  
Santa Ana River

Environmental context. There is concern that there may be public health issues associated with dissolved organic carbon (DOC) because of its unknown composition and reactivity to disinfection in water used for public supply. Here, changes in the concentration and composition of DOC in stormflow (1995–2004) in the Santa Ana River and its tributaries is evaluated based on its optical properties, molecular weight and solubility differences of the contributing DOC components. Such a study may allow improved water management in the future. Ongoing work in the study area has shown that DOC in surface water diverted for groundwater recharge degrades to near natural levels in underlying aquifers pumped for public supply. Abstract. The composition of dissolved organic carbon (DOC) in stormflow from urban areas has been greatly altered, both directly and indirectly, by human activities and there is concern that there may be public health issues associated with DOC, which has unknown composition from different sources within urban watersheds. This study evaluated changes in the concentration and composition of DOC in stormflow in the Santa Ana River and its tributaries between 1995 and 2004 using a simplified approach based on the differences in the optical properties of DOC and using operationally defined differences in molecular weight and solubility. The data show changes in the composition of DOC in stormflow during the rainy season and differences associated with runoff from different parts of the basin, including extensive upland areas burned prior to the 2004 rainy season. Samples were collected from the Santa Ana River, which drains ~6950 km2 of the densely populated coastal area of southern California, during 23 stormflows between 1995 and 2004. Dissolved organic carbon (DOC) concentrations during the first stormflows of the ‘winter’ (November to March) rainy season increased rapidly with streamflow and were positively correlated with increased faecal indicator bacteria concentrations. DOC concentrations were not correlated with streamflow or with other constituents during stormflows later in the rainy season and DOC had increasing UV absorbance per unit carbon as the rainy season progressed. DOC concentrations in stormflow from an urban drain tributary to the river also increased during stormflow and were greater than concentrations in the river. DOC concentrations in stormflow from a tributary stream, draining urban and agricultural land that contained more than 320000 animals, mostly dairy cows, were higher than concentrations in stormflow from the river and from the urban drain. Fires that burned large areas of the basin before the 2004 rainy season did not increase DOC concentrations in the river during stormflow after the fires – possibly because the large watershed of the river damped the effect of the fires. However, the fires increased the hydrophobic neutral organic carbon fraction of DOC in stormflow from the urban drain and the tributary stream.

scholarly journals Characterization of bacterioplankton communities and quantification of organic carbon pools off the Galapagos Archipelago under contrasting environmental conditions

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5984 ◽  
Author(s):  
Nataly Carolina Guevara Campoverde ◽  
Christiane Hassenrück ◽  
Pier Luigi Buttigieg ◽  
Astrid Gärdes
Keyword(s):  
Organic Carbon ◽  
Carbon Cycle ◽  
Dissolved Organic Carbon ◽  
Bacterial Communities ◽  
Carbon Pools ◽  
Aggregate Formation ◽  
Galapagos Archipelago ◽  
Carbon Concentrations ◽  
Bacterioplankton Communities

Bacteria play a crucial role in the marine carbon cycle, contributing to the production and degradation of organic carbon. Here, we investigated organic carbon pools, aggregate formation, and bacterioplankton communities in three contrasting oceanographic settings in the Galapagos Archipelago. We studied a submarine CO2 vent at Roca Redonda (RoR), an upwelling site at Bolivar Channel (BoC) subjected to a weak El Niño event at the time of sampling in October 2014, as well as a site without volcanic or upwelling influence at Cowley Islet (CoI). We recorded physico-chemical parameters, and quantified particulate and dissolved organic carbon, transparent exopolymeric particles, and the potential of the water to form larger marine aggregates. Free-living and particle-attached bacterial communities were assessed via 16S rRNA gene sequencing. Both RoR and BoC exhibited temperatures elevated by 1–1.5 °C compared to CoI. RoR further experienced reduced pH between 6.8 and 7.4. We observed pronounced differences in organic carbon pools at each of the three sites, with highest dissolved organic carbon concentrations at BoC and RoR, and highest particulate organic carbon concentrations and aggregate formation at BoC. Bacterioplankton communities at BoC were dominated by opportunistic copiotrophic taxa, such as Alteromonas and Roseobacter, known to thrive in phytoplankton blooms, as opposed to oligotrophic taxa dominating at CoI, such as members of the SAR11 clade. Therefore, we propose that bacterial communities were mainly influenced by the availability of organic carbon at the investigated sites. Our study provides a comprehensive characterization of organic carbon pools and bacterioplankton communities, highlighting the high heterogeneity of various components of the marine carbon cycle around the Galapagos Archipelago.

scholarly journals Fine-scale temporal characterization of trends in soil water dissolved organic carbon and potential drivers

2016 ◽  
Vol 68 ◽  
pp. 36-51 ◽  
Author(s):  
K. Sawicka ◽  
D.T. Monteith ◽  
E.I. Vanguelova ◽  
A.J. Wade ◽  
J.M. Clark
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Soil Water ◽  
Fine Scale

Analysis of Genotoxicity and Characterization of Dissolved Organic Matter in the Aniline Industrial Wastewater

2014 ◽  
Vol 1010-1012 ◽  
pp. 472-477 ◽  
Author(s):  
Zhe Wang ◽  
Wen Yu Zhao ◽  
Li Wei Xu ◽  
Qi Mu
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Industrial Wastewater ◽  
Adsorption Method ◽  
Resin Adsorption ◽  
Hydrophobic Acids ◽  
A Company

Effluent of aniline wastewater treatment from a company was isolated and fractionated by resin adsorption method into six different fractions. These fractions are operationally categorized as hydrophobic acids (HOA), hydrophobic bases (HOB), hydrophobic neutrals (HON), hydrophilic acids (HIA), hydrophilic bases (HIB) and hydrophilic neutrals (HIN). The dissolved organic carbon (DOC), ultraviolet-visible (UV) and genotoxicity of each fractions were determined. The results showed that hydrophobic matter is the main fractions of DOC and makes the main contributions to the genotoxicity of effluent of aniline wastewater treatment.

Characterization of dissolved organic carbon in shallow groundwater of chronic kidney disease affected regions in Sri Lanka

2019 ◽  
Vol 660 ◽  
pp. 865-875 ◽  
Author(s):  
Madhubhashini Makehelwala ◽  
Yuansong Wei ◽  
Sujithra K. Weragoda ◽  
Rohan Weerasooriya ◽  
Libing Zheng
Keyword(s):  
Chronic Kidney Disease ◽  
Sri Lanka ◽  
Kidney Disease ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Shallow Groundwater

Characterization of Dissolved Organic Carbon and Disinfection By-products in Biochar Filter Leachate Using Orbitrap Mass Spectrometry

2021 ◽  
pp. 127691
Author(s):  
Atcharaporn Youngwilai ◽  
Phanwatt Phungsai ◽  
Nontipa Supanchaiyamat ◽  
Andrew J. Hunt ◽  
Yuvarat Ngernyen ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Orbitrap Mass Spectrometry ◽  
By Products

Rainwater Dissolved Organic Carbon: Characterization of Surface Active Substances by Electrochemical Method

2007 ◽  
Vol 19 (19-20) ◽  
pp. 2077-2084 ◽  
Author(s):  
Božena Ćosović ◽  
Palma Orlović Leko ◽  
Zlatica Kozarac
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Electrochemical Method ◽  
Surface Active ◽  
Active Substances
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