Measurement of carbonaceous aerosols: validation of a thermal gravimetric method and its comparison with a thermal optical transmittance method

2004 ◽  
Vol 77 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Della Wai-mei Sin ◽  
Wai-hong Fung ◽  
Ya-yin Choi ◽  
Chi-ho Lam ◽  
Yiu-chung Wong
Keyword(s):  
Gravimetric Method ◽  
Optical Transmittance ◽  
Carbonaceous Aerosols ◽  
Thermal Gravimetric

scholarly journals The Measurement of Wood in Construction Dust Samples: A Furnace Based Thermal Gravimetric Approach

2019 ◽  
Vol 63 (9) ◽  
pp. 1070-1080
Author(s):  
Peter Stacey ◽  
Andrew Simpson ◽  
Susan Hambling
Keyword(s):  
Mineral Dust ◽  
Limit Of Detection ◽  
Rietveld Method ◽  
Gravimetric Method ◽  
Wood Dust ◽  
Thermal Gravimetric ◽  
Construction Sites ◽  
Quartz Fibre ◽  
Median Proportion ◽  
Inhalable Dust

Abstract A furnace-based thermal gravimetric method was developed to measure wood in inhalable construction dust. The application of this method showed that reliance on the inhalable concentrations alone may substantially overestimate carpenters’ exposures to wood dust at construction worksites. Test samples were prepared by collecting aerosols of gypsum, calcite, quartz, concrete, and wood dust onto quartz fibre filters using the Button inhalable sampler. The average difference between the measured and loaded mass of wood is 2% over the whole analytical range. Ninety percent of thermogravimetric measurements on all test samples (n = 35) were 13% or less. The limit of detection was measured as 0.065 mg. The thermal gravimetric method was applied to samples collected from four new build construction sites and one shop fitting worksite. The workplace inhalable wood dust results ranged from 15% to 104% of the total inhalable dust values. In addition, an x-ray diffraction (XRD) Rietveld method was applied as a complimentary approach to explain the composition of the remaining inhalable dust. Most combined thermal gravimetric and XRD measurements were within 10% of the total inhalable dust mass values, determined gravimetrically. Ninety-five percent were within 26%. The median proportion of mineral dust containing gypsum, calcite, quartz, dolomite, or rutile was 30%. The proportion of mineral dust on individual filters varied considerably.

scholarly journals On the quantification of atmospheric carbonate carbon by thermal/optical analysis protocols

2010 ◽  
Vol 3 (6) ◽  
pp. 5375-5409 ◽  
Author(s):  
A. Karanasiou ◽  
E. Diapouli ◽  
M. Viana ◽  
A. Alastuey ◽  
X. Querol ◽  
...  
Keyword(s):  
Atmospheric Aerosols ◽  
Atmospheric Chemistry ◽  
Carbonaceous Material ◽  
Optical Transmittance ◽  
Precise Determination ◽  
European Countries ◽  
Maximum Temperature ◽  
Analytical Determination ◽  
Carbonaceous Aerosols ◽  
Carbonate Carbon

Abstract. Carbonaceous species, usually classified into two categories, organic carbon (OC) and elemental carbon (EC), constitute an important component of the atmospheric aerosol. Carbonate carbon (CC), or inorganic carbon, another constituent of carbonaceous material, is often not considered in many atmospheric chemistry studies. The reason for this may be its low contribution to fine particle mass in most areas studied, along with the difficulties in its analytical determination in atmospheric aerosols. The objective of this study was the quantification of atmospheric carbonate concentrations using the thermal optical transmittance method (Sunset Laboratory, Inc.). Three different temperature protocols (two modified NIOSH protocols and the EUSAAR-2 protocol) were tested on filter samples containing known amounts of CC. Moreover, the performance of the two most widely used protocols across European countries (NIOSH and EUSAAR-2) was also checked on two different instruments namely the semi-continuous OCEC analyzer and the laboratory OCEC analyzer. NIOSH-840 thermal protocol (NIOSH protocol with a maximum temperature of 840 °C in the He-mode) can be used for the detection and quantification of atmospheric carbonate concentrations. CC was determined in ambient PM10 and PM2.5 samples From Athens and Barcelona by using the NIOSH-840 thermal protocol. The results confirm that in South European countries CC may constitute a significant fraction of carbonaceous aerosols (~15%), thus it should not be neglected. However, the NIOSH-840 protocol seems to overestimate the OC concentrations when compared to the EUSAAR-2 protocol. The results suggest that during dust episodes, common for the Southern Europe, the analytical laboratories could use the NIOSH-840 protocol as a suitable method for the carbonate determination and manually integrate the sharp peak that appears in the maximum temperature step in the inert mode. Afterwards, carbonate should be evaporated by a fumigation method and one could then apply the EUSAAR-2 protocol for the precise determination of OC and EC fractions.

ANALISIS FISIKA KIMIA DARI KERANG DARA (Anadara granosa) YANG BERASAL DARI KAYUTANYO KAB. BANGGAI The Analysis of physical chemical from dara shells (Anadara granosa) origin from Kayutanyo, Kab.Banggai

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
SULASMI ANGGO
Keyword(s):  
Protein Content ◽  
Water Content ◽  
Water Solubility ◽  
Gravimetric Method ◽  
Fat Content ◽  
Carbohydrate Content ◽  
Dust Content ◽  
Total Dust ◽  
Physical Chemical ◽  
Anadara Granosa

The Analysis of physical chemical from dara shells (Anadara granosa) origin from Kayutanyo, kab. Banggai, has been conducted.Dara shell meat is sleaned and dried and after that powered with blender. Determine % rendement, water bonding capacity and index water solubility with Anderson method, coarse fat content with gravimetric method and carbohydrate method with “bye difference” decrease method.The result of analysis showed rendement value is 24,35%, water bonding capacity is 1,6248 gram/ml, index water solubility is 0,202 gram/ml, water content is 79,0045%, total dust content is 1,072%, coarse protein content is 2,25%, coarse fat content is 8,47%, carbohydrate content is 9,2035%. Keyword : Dara shells, (Anadara granosa), analysis physical chemical

Thermal gravimetric analysis of in-situ crosslinked nanocellulose whiskers • poly(methyl vinyl ether-co-maleic acid) • polyethylene glycol

TAPPI Journal ◽  
2011 ◽  
Vol 10 (4) ◽  
pp. 29-33
Author(s):  
LEE A. GOETZ ◽  
AJI P. MATHEW ◽  
KRISTIINA OKSMAN ◽  
ARTHUR J. RAGAUSKAS
Keyword(s):  
Thermal Stability ◽  
Polyethylene Glycol ◽  
Vinyl Ether ◽  
Thermal Gravimetric Analysis ◽  
Maleic Acid ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Methyl Vinyl ◽  
Methyl Vinyl Ether

The thermal stability and decomposition of in-situ crosslinked nanocellulose whiskers – poly(methyl vinyl ether-co-maleic acid) – polyethylene glycol formulations (PMVEMA-PEG), (25%, 50%, and 75% whiskers) – were investigated using thermal gravimetric analysis (TGA) methods. The thermal degradation behavior of the films varied according to the percent cellulose whiskers in each formulation. The presence of cellulose whiskers increased the thermal stability of the PMVEMA-PEG matrix.

Contribution of brown carbon and lensing to the direct radiative effect of carbonaceous aerosols from biomass and biofuel burning emissions

2015 ◽  
pp. n/a-n/a ◽  
Author(s):  
Rawad Saleh ◽  
Marguerite Marks ◽  
Jinhyok Heo ◽  
Peter J. Adams ◽  
Neil M. Donahue ◽  
...  
Keyword(s):  
Carbonaceous Aerosols ◽  
Radiative Effect ◽  
Brown Carbon

PREPARATION AND CHARACTERIZATION OF POLYVINYL ALCOHOL THIN FILMS FOR ORGANIC THIN FILM TRANSISTORS AND BIOMEDICAL APPLICATIONS

2018 ◽  
Vol 5 (2) ◽  
pp. 16-18
Author(s):  
Chandar Shekar B ◽  
Ranjit Kumar R ◽  
Dinesh K.P.B ◽  
Sulana Sundar C ◽  
Sunnitha S ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Thin Film Transistors ◽  
Gravimetric Method ◽  
Dip Coating ◽  
Organic Thin Film Transistors ◽  
Poly Vinyl Alcohol ◽  
Organic Thin Film ◽  
Glass Substrates ◽  
Coating Method

Thin films of poly vinyl alcohol (PVA) were prepared on pre-cleaned glass substrates by Dip Coating Method. FTIR spectrum was used to identify the functional groups present in the prepared films. The vibrational peaks observed at 1260 cm-1 and 851 cm-1 are assigned to C–C stretching and CH rocking of PVA.The characteristic band appearing at 1432 cm-1 is assigned to C–H bend of CH2 of PVA. The thickness of the prepared thin films were measured by using an electronic thickness measuring instrument (Tesatronic-TTD20) and cross checked by gravimetric method. XRD spectra indicated the amorphous nature of the films.Surface morphology of the coated films was studied by scanning electron microscope (SEM). The surface revealed no pits and pin holes on the surface. The observed surface morphology indicated that these films could be used as dielectric layer in organic thin film transistors and as drug delivery system for wound healing.

Adsorption and corrosion inhibition characteristics of two medicinal molecules

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Half Life ◽  
Thermodynamic Data ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Corrosive Environment ◽  
Corrosion Inhibition Efficiency

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

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