Comparison of Two Filter-Based Reflectance Methods to Measure the Light Absorption by Atmospheric Aerosols

Aryal, Rudra; Terman, P. A.; Voss, Kenneth J.

doi:10.1175/jtech-d-13-00131.1

Cited by 7 publications

(6 citation statements)

References 32 publications

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“…In the extended Table 3. Temperature steps and residence times for the NIOSH870 protocol (Panteliadis et al, 2015;Birch and Cary, 1996). technique (Wonaschütz et al, 2009) the sphere is illuminated with a halogen light source equipped with three interference filters (450, 550 and 650 nm) and the wavelength-dependent light signal is recorded with a photodiode.…”

Section: Cast Burning Conditions Black Brownmentioning

confidence: 99%

“…Absorbance spectra where calculated with the Kubelka-Munk equation (Kubelka and Munk, 1931) from the measured reflectance spectra. Although the Kubelka-Munk theory was developed originally for powder samples, its applicability to aerosol filter samples was shown by Aryal et al (2014).…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

“…Different thermal-optical measurement protocols vary in height and duration of the individual temperature steps, particularly in the maximum temperature of the inert (He) mode -maximum temperatures between 580 • C (IMPROVE A, Chow et al, 2004) and 870 • C (NIOSH870, Panteliadis et al, 2015;Birch and Cary, 1996). This leads to different charring behaviors of OC.…”

Section: Introductionmentioning

confidence: 99%

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Structural changes of CAST soot during a thermal–optical measurement protocol

et al. 2019

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Abstract. Thermal–optical measurement techniques are widely used to classify carbonaceous material. The results of different methods for total carbon are comparable but can vary by >44 % for elemental carbon. One major cause of variation is the formation of pyrolyzed carbon during the heating process which occurs mainly in samples with a high amount of brown carbon (BrC). In this study the structural changes of two different CAST (combustion aerosol standard) aerosol samples caused by the heating procedure in a thermal–optical instrument were investigated with UV–VIS and Raman spectroscopy, the integrating-sphere technique (IS) and transmission electron microscopy. All analysis techniques showed significant structural changes for BrC-rich samples at the highest temperature level (870 ∘C) in helium. The structure of the heated BrC-rich sample resembles the structure of an unheated BrC-poor sample. Heating the BrC-rich sample to 870 ∘C increases the graphitic domain size within the material from 1.6 to 2 nm. Although the Raman spectra unambiguously show this increase in ordering only at the highest temperature step, UV–VIS and IS analyses show a continuous change in the optical properties also at lower temperatures. The sample with a negligible amount of BrC, however, did not show any significant structural changes during the whole heating procedure.

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Section: Cast Burning Conditions Black Brownmentioning

confidence: 99%

Section: Uv-vis Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural changes of CAST soot during a thermal–optical measurement protocol

et al. 2019

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“…Different thermal-optical measurement protocols vary in height and duration of the individual temperature steps, particularly in the maximum temperature of the inert (He) mode (maximum temperatures between 580°C (IMPROVE A, Chow et al, 2004) and 870°C (NIOSH870, Panteliadis et al, 2015;Birch and Cary, 1996)). This leads to different charring behaviours of OC.…”

Section: Introductionmentioning

confidence: 99%

Structural changes of CAST soot during a thermal-optical measurement protocol

Haller¹,

Rentenberger²,

Meyer³

et al. 2019

Preprint

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Thermal-optical measurement techniques are widely used to classify carbonaceous material. The results of different methods for total carbon are comparable, but can vary by >44% for elemental carbon. One major cause of variation is the formation 10 of pyrolyzed carbon during the heating process which occurs mainly in samples with a high amount of brown carbon (BrC).In this study the structural changes of two different CAST aerosol samples caused by the heating procedure in a thermaloptical instrument were investigated with UV-VIS and Raman spectroscopy, the Integrating Sphere technique and transmission electron microscopy. All analysis techniques showed significant structural changes for BrC rich samples at the highest temperature level (870°C) in helium. The structure of the heated BrC-rich sample resembles the structure of an 15 unheated BrC-poor sample. Heating the BrC rich sample to 870°C increases the graphitic domain size within the material from 1.6 nm to 2 nm. Although the Raman spectra unambiguously show this increase of ordering only at the highest temperature step, UV-VIS and IS analyses show a continuous change of the optical properties also at lower temperatures.The sample with a negligible amount of BrC, however, did not show any significant structural changes during the whole heating procedure.

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“…The particles of this size range have a long residence time in the atmosphere and therefore can spread over long distances, affecting both human health and the quality of the atmospheric environment. PM2.5 is the main cause of haze and is the top atmospheric pollutant leading to air pollution (Aryal et al 2014;Cropper et al 2013;Chang and Tsai 2003). Currently, methods for monitoring atmospheric PM concentrations mainly include the weighing method, the oscillatingmicrobalance method, and the β ray method (Giorio et al 2013;Takahashi et al 2008;Chueinta and Hopke 2001).…”

Section: Introductionmentioning

confidence: 99%

A method for monitoring mass concentration of black carbon particulate matter using photothermal interferometry

Wang

2015

Environ Sci Pollut Res

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A method for measurements of mass concentration of black carbon particulate matter (PM) is proposed based on photothermal interferometry (PTI). A folded Jamin photothermal interferometer was used with a laser irradiation of particles deposited on a filter paper. The black carbon PM deposited on the filter paper was regarded as a film while the quartz filter paper was regarded as a substrate to establish a mathematical model for measuring the mass concentration of PM using a photothermal method. The photothermal interferometry system was calibrated and used to measure the atmospheric PM concentration corresponding to different dust-treated filter paper. The measurements were compared to those obtained using β ray method and were found consistent. This method can be particularly relevant to polluted atmospheres where PM is dominated by black carbon.

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Comparison of Two Filter-Based Reflectance Methods to Measure the Light Absorption by Atmospheric Aerosols

Cited by 7 publications

References 32 publications

Structural changes of CAST soot during a thermal–optical measurement protocol

Structural changes of CAST soot during a thermal–optical measurement protocol

Structural changes of CAST soot during a thermal-optical measurement protocol

A method for monitoring mass concentration of black carbon particulate matter using photothermal interferometry

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