Understanding global carbon cycle is critical to uncover the mechanisms of global warming and remediate its adverse ef fects on human activities.Organic carbon in marine sediments is an indispensable part of the globa...Understanding global carbon cycle is critical to uncover the mechanisms of global warming and remediate its adverse ef fects on human activities.Organic carbon in marine sediments is an indispensable part of the global carbon reservoir in global carbon cycling.Evaluating such a reservoir calls for quantitative studies of marine carbon burial,which closely depend on quantifying total organic carbon and black carbon in marine sediment cores and subsequently on obtaining their high-resolution temporal sequences.However,the conventional methods for detecting the contents of total organic carbon or black carbon cannot resolve the following specific difficulties,i.e.,(1)a very limited amount of each subsample versus the diverse analytical items,(2) a low and fluctuating recovery rate of total organic carbon or black carbon versus the reproducibility of carbon data,and(3)a large number of subsamples versus the rapid batch measurements.In this work,(i)adopting the customized disposable ceramic crucibles with the microporecontrolled ability,(ii)developing self-made or customized facilities for the procedures of acidification and chemothermal oxidization,and(iii)optimizing procedures and carbon-sulfur analyzer,we have built a novel Wang-Xu-Yuan method(the WXY method)for measuring the contents of total organic carbon or black carbon in marine sediment cores,which includes the procedures of pretreatment,weighing,acidification,chemothermal oxidation and quantification;and can fully meet the requirements of establishing their highresolution temporal sequences,whatever in the recovery,experimental efficiency,accuracy and reliability of the measurements,and homogeneity of samples.In particular,the usage of disposable ceramic crucibles leads to evidently simplify the experimental scenario,which further results in the very high recovery rates for total organic carbon and black carbon.This new technique may provide a significant support for revealing the mechanism of carbon burial and evaluating the capacity of marine carbon accumulation and sequestration.展开更多
Aiming at the characteristics of carbon black,a new method of controlling the black smoke from the industrial coal-burning ceramic kilns by wetting was brought forward.The carbon black in the flue of coal-burning cera...Aiming at the characteristics of carbon black,a new method of controlling the black smoke from the industrial coal-burning ceramic kilns by wetting was brought forward.The carbon black in the flue of coal-burning ceramic kiln was collected for the experiments,and its physical and chemical properties were studied in detail.In order to change the sedimentation and wettabil-ity state of the carbon black,the complex solution of the coagulant and surfactant was applied.After a series of orthogonal experiments,the complex solutions with bet-ter effects were chosen.Then,the sedimentation percent-age of carbon black treated by the selected complex solutions was measured.The optimized complex solutions included Na 2 SO 4(100 mmol/L),sodium dodecylbenzene-sulfonate(SDBS)(1.2 mmol/L)and polyacrylamide(PAM)(40 mg/L).After carbon black was absorbed,the complex solutions were clear and colorless.The complex solutions can be recycled,and the sedimentation percent-age of carbon black is 94%.展开更多
基金Supported by the National Basic Research Program of China(973 Program)(No.2012CB956004)the Fundamental Research Funds for the Central Universities(No.16lgjc22)
文摘Understanding global carbon cycle is critical to uncover the mechanisms of global warming and remediate its adverse ef fects on human activities.Organic carbon in marine sediments is an indispensable part of the global carbon reservoir in global carbon cycling.Evaluating such a reservoir calls for quantitative studies of marine carbon burial,which closely depend on quantifying total organic carbon and black carbon in marine sediment cores and subsequently on obtaining their high-resolution temporal sequences.However,the conventional methods for detecting the contents of total organic carbon or black carbon cannot resolve the following specific difficulties,i.e.,(1)a very limited amount of each subsample versus the diverse analytical items,(2) a low and fluctuating recovery rate of total organic carbon or black carbon versus the reproducibility of carbon data,and(3)a large number of subsamples versus the rapid batch measurements.In this work,(i)adopting the customized disposable ceramic crucibles with the microporecontrolled ability,(ii)developing self-made or customized facilities for the procedures of acidification and chemothermal oxidization,and(iii)optimizing procedures and carbon-sulfur analyzer,we have built a novel Wang-Xu-Yuan method(the WXY method)for measuring the contents of total organic carbon or black carbon in marine sediment cores,which includes the procedures of pretreatment,weighing,acidification,chemothermal oxidation and quantification;and can fully meet the requirements of establishing their highresolution temporal sequences,whatever in the recovery,experimental efficiency,accuracy and reliability of the measurements,and homogeneity of samples.In particular,the usage of disposable ceramic crucibles leads to evidently simplify the experimental scenario,which further results in the very high recovery rates for total organic carbon and black carbon.This new technique may provide a significant support for revealing the mechanism of carbon burial and evaluating the capacity of marine carbon accumulation and sequestration.
基金This work was supported by the Trans-Century Training Program Foundation for the Talent of China(Grant No.NCET-04-0769)the Key Program of the Ministry of Education of China(Grant No.105126)the Key Program of the Natural Science Foundation of Hunan Province,China(Grant No.03JJY2002).
文摘Aiming at the characteristics of carbon black,a new method of controlling the black smoke from the industrial coal-burning ceramic kilns by wetting was brought forward.The carbon black in the flue of coal-burning ceramic kiln was collected for the experiments,and its physical and chemical properties were studied in detail.In order to change the sedimentation and wettabil-ity state of the carbon black,the complex solution of the coagulant and surfactant was applied.After a series of orthogonal experiments,the complex solutions with bet-ter effects were chosen.Then,the sedimentation percent-age of carbon black treated by the selected complex solutions was measured.The optimized complex solutions included Na 2 SO 4(100 mmol/L),sodium dodecylbenzene-sulfonate(SDBS)(1.2 mmol/L)and polyacrylamide(PAM)(40 mg/L).After carbon black was absorbed,the complex solutions were clear and colorless.The complex solutions can be recycled,and the sedimentation percent-age of carbon black is 94%.
