Seasonal and spatial trends in primary and secondary organic carbon concentrations in southeast Texas

2004 ◽  
Vol 38 (20) ◽  
pp. 3225-3239 ◽  
Author(s):  
Matthew Russell ◽  
David T. Allen
Keyword(s):  
Organic Carbon ◽  
Spatial Trends ◽  
Southeast Texas ◽  
Secondary Organic Carbon ◽  
Carbon Concentrations

scholarly journals Decreasing concentrations of carbonaceous aerosols in China from 2003 to 2013

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan Cheng ◽  
Judith C. Chow ◽  
John G. Watson ◽  
Jiamao Zhou ◽  
Suixin Liu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Coal Combustion ◽  
Elemental Carbon ◽  
Total Carbon ◽  
Carbonaceous Aerosols ◽  
Carbon Reduction ◽  
Northern Cities ◽  
Secondary Organic Carbon ◽  
Emission Changes ◽  
Carbon Concentrations

AbstractCarbonaceous aerosols were characterized in 19 Chinese cities during winter and summer of 2013. Measurements of organic carbon (OC) and elemental carbon (EC) levels were compared with those from 14 corresponding cities sampled in 2003 to evaluate effects of emission changes over a decade. Average winter and summer OC and EC decreased by 32% and 17%, respectively, from 2003 to 2013, corresponding to nationwide emission control policies implemented since 2006. The extent of carbon reduction varied by season and by location. Larger reductions were found for secondary organic carbon (SOC, 49%) than primary organic carbon (POC, 25%). PM2.5 mass and total carbon concentrations were three to four times higher during winter than summer especially in the northern cities that use coal combustion for heating.

scholarly journals Oxygen consumption during mineralization of organic compounds in water samples from a small sub-tropical reservoir (Brazil)

2003 ◽  
Vol 46 (4) ◽  
pp. 723-729 ◽  
Author(s):  
Marcela Bianchessi da Cunha-Santino ◽  
Irineu Bianchini Júnior
Keyword(s):  
Oxygen Consumption ◽  
Organic Carbon ◽  
Organic Compounds ◽  
Tannic Acid ◽  
Theoretical Calculations ◽  
Tropical Reservoir ◽  
First Order ◽  
First Order Kinetics ◽  
Mineralization Processes ◽  
Carbon Concentrations

Assays were carried out to evaluate the oxygen consumption resulting from mineralization of different organic compounds: glucose, sucrose, starch, tannic acid, lysine and glycine. The compounds were added to 1 l of water sample from Monjolinho Reservoir. Dissolved oxygen and dissolved organic carbon were monitored during 20 days and the results were fitted to first order kinetics model. During the 20 days of experiments, the oxygen consumption varied from 4.5 mg.l-1 (tannic acid) to 71.5 mg.l-1 (glucose). The highest deoxygenation rate (kD) was observed for mineralization of tannic acid (0.321 day-1) followed by glycine, starch, lysine, sucrose and glucose (0.1004, 0.0504, 0.0486, 0.0251 and 0.0158 day-1, respectively). From theoretical calculations and oxygen and carbon concentrations we obtained the stoichiometry of the mineralization processes. Stoichiometric values varied from 0.17 (tannic acid) to 2.55 (sucrose).

Predicting soil organic carbon concentrations in a low relief landscape, eastern Iran

2018 ◽  
Vol 15 ◽  
pp. e00195 ◽  
Author(s):  
Mohammad Reza Pahlavan-Rad ◽  
Khodadad Dahmardeh ◽  
Colby Brungard
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Eastern Iran ◽  
Carbon Concentrations
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