scholarly journals Influence of High Relative Humidity on Secondary Organic Carbon: Observations at a Background Site in East China

2019 ◽  
Vol 33 (5) ◽  
pp. 905-913 ◽  
Author(s):  
Linlin Liang ◽  
Guenter Engling ◽  
Yuan Cheng ◽  
Xiaoye Zhang ◽  
Junying Sun ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Organic Carbon ◽  
High Relative Humidity ◽  
East China ◽  
Background Site ◽  
Secondary Organic Carbon

scholarly journals An investigation on hygroscopic properties of 15 black carbon (BC) from different carbon sources: Roles of organic and inorganic components

2020 ◽  
Author(s):  
Minli Wang ◽  
Yiqun Chen ◽  
Heyun Fu ◽  
Xiaolei Qu ◽  
Bengang Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
Relative Humidity ◽  
Organic Carbon ◽  
Black Carbon ◽  
Water Uptake ◽  
Carbon Sources ◽  
High Relative Humidity ◽  
Gravimetric Analysis ◽  
Hygroscopic Properties ◽  
Kinetics Of

Abstract. The hygroscopic behavior of black carbon (BC) has a significant impact on global and regional climate change. However, the mechanism and factors controlling the hygroscopicity of BC from different carbon sources are not well understood. Here, we systematically measured the equilibrium and kinetics of water uptake by 15 different BC (10 herb-derived BC, 2 wood-derived BC, and 3 soot) using gravimetric water vapor sorption method combined with in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). In the gravimetric analysis, the sorption/desorption equilibrium isotherms were measured under continuous-stepwise water vapor pressure conditions, while the kinetics was measured at a variety of humidity levels obtained by different saturated aqueous salt solutions. The equilibrium water uptake of the BC pool at high relative humidity (> 80 %) positively correlated to the dissolved mineral content (0.01–13.0 wt %) (R2 = 0.86, P = 0.0001) as well as the content of the thermogravimetrically analyzed organic carbon (OCTGA, 4.48–15.25 wt %) (R2 = 0.52, P = 0.002) and the alkali-extracted organic carbon (OCAE, 0.14–8.39 wt %) (R2 = 0.80, P = 0.0001). In contrast, no positive correlation was obtained with the content of total organic carbon or elemental carbon. Among the major soluble ionic constituents, chloride and ammonium were each correlated with the equilibrium water uptake at high relative humidity. Compared with the herbal BC and soot, the woody BC had much lower equilibrium water uptake, especially at high relative humidity, likely due to the very low dissolved material content and OC content. The DRIFTS analysis provided generally consistent results at low relative humidity. The kinetics of water uptake (measured by pseudo-second order rate constant) correlated to the content of OCTGA and OCAE as well as the content of chloride and ammonium at low relative humidity (33 %), but to the porosity of bulk BC at high relative humidity (94 %). This was the first study to show that BC of different types and sources has greatly varying hygroscopic properties.

scholarly journals An investigation on hygroscopic properties of 15 black carbon (BC)-containing particles from different carbon sources: roles of organic and inorganic components

2020 ◽  
Vol 20 (13) ◽  
pp. 7941-7954
Author(s):  
Minli Wang ◽  
Yiqun Chen ◽  
Heyun Fu ◽  
Xiaolei Qu ◽  
Bengang Li ◽  
...  
Keyword(s):  
Water Vapor ◽  
Relative Humidity ◽  
Organic Carbon ◽  
Black Carbon ◽  
Water Uptake ◽  
Mineral Content ◽  
Carbon Sources ◽  
High Relative Humidity ◽  
Hygroscopic Properties ◽  
Kinetics Of

Abstract. The hygroscopic behavior of black carbon (BC)-containing particles (BCPs) has a significant impact on global and regional climate change. However, the mechanism and factors controlling the hygroscopicity of BCPs from different carbon sources are not well understood. Here, we systematically measured the equilibrium and kinetics of water uptake by 15 different BCPs (10 herb-derived BCPs, 2 wood-derived BCPs, and 3 soot-type BCPs) using a gravimetric water vapor sorption method combined with in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). In the gravimetric analysis, the sorption–desorption equilibrium isotherms were measured under continuous-stepwise water vapor pressure conditions, while the kinetics was measured at a variety of humidity levels obtained by different saturated aqueous salt solutions. The equilibrium water uptake of the tested group of BCPs at high relative humidity (>80 %) positively correlated to the dissolved mineral content (0.01–13.0 wt %) (R2=0.86, P=0.0001), the content of the thermogravimetrically analyzed organic carbon (OCTGA, 4.48–15.25 wt %) (R2=0.52, P=0.002), and the content of the alkali-extracted organic carbon (OCAE, 0.14–8.39 wt %) (R2=0.80, P=0.0001). In contrast, no positive correlation was obtained with the content of total organic carbon or elemental carbon. Among the major soluble ionic constituents, chloride and ammonium were each correlated with the equilibrium water uptake at high relative humidity. Compared with the herbal BCPs and soot, the woody BCPs had much lower equilibrium water uptake, especially at high relative humidity, likely due to the very low dissolved mineral content and OC content. The DRIFTS analysis provided generally consistent results at low relative humidity. The kinetics of water uptake (measured by pseudo-second-order rate constant) correlated to the content of OCTGA and OCAE as well as the content of chloride and ammonium at low relative humidity (33 %) but to the porosity of BCPs at high relative humidity (94 %). This was the first study to show that BCPs of different types and sources had greatly varying hygroscopic properties.

Persistence of nosocomial bacteria on 2 biocidal fabrics based on silver under conditions of high relative humidity

2014 ◽  
Vol 42 (8) ◽  
pp. 879-884 ◽  
Author(s):  
Rosa López-Gigosos ◽  
Alberto Mariscal ◽  
Mario Gutierrez-Bedmar ◽  
Eloisa Mariscal-Lopez ◽  
Joaquín Fernández-Crehuet
Keyword(s):  
Relative Humidity ◽  
High Relative Humidity

scholarly journals Method for Improving the Collecting Performance of Iodine Samplers under High Relative Humidity

1973 ◽  
Vol 10 (5) ◽  
pp. 292-300 ◽  
Author(s):  
Mitsuo NARITOMI ◽  
Yoshikazu YOSHIDA ◽  
Seiji FUKUDA
Keyword(s):  
Relative Humidity ◽  
High Relative Humidity

Coupled effect of ambient high relative humidity and varying temperature marine environment on corrosion of reinforced concrete

2012 ◽  
Vol 28 (1) ◽  
pp. 670-679 ◽  
Author(s):  
Abdulrahman Alhozaimy ◽  
Raja Rizwan Hussain ◽  
Rajeh Al-Zaid ◽  
Abdulaziz Al-Negheimish
Keyword(s):  
Reinforced Concrete ◽  
Relative Humidity ◽  
Marine Environment ◽  
High Relative Humidity ◽  
Coupled Effect

Electrostatics demonstrations at high relative humidity

1984 ◽  
Vol 52 (1) ◽  
pp. 86-86 ◽  
Author(s):  
William Lichten ◽  
Paul McGrath
Keyword(s):  
Relative Humidity ◽  
High Relative Humidity
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