Determination Method for Gaseous and Particulate Polynuclear Aromatics by using Quartz Fiber Filter and Adsorbent.

Abstract. HO2 uptake coefficients for ambient aerosol particles, collected on quartz fiber filter using a high-volume air sampler in China, were measured using an aerosol flow tube coupled with a chemical conversion/laser-induced fluorescence technique at 760 Torr and 298 K, with a relative humidity of 75%. Aerosol particles were regenerated with an atomizer using the water extracts from the aerosol particles. Over 10 samples, the measured HO2 uptake coefficients for the aerosol particles at the Mt. Tai site were ranged from 0.13 to 0.34, while those at the Mt. Mang site were in the range of 0.09–0.40. These values are generally larger than those previously reported for single-component particles, suggesting that reactions with the minor components such as metal ions and organics in the particle could contribute to the HO2 uptake. A box model calculation suggested that the heterogeneous loss of HO2 by ambient particles could significantly affect atmospheric HOx concentrations and chemistry.

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Performance of a Quartz Fiber Filter Operating in the Filtration of Gases at High Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.591-593.821 ◽

2008 ◽

Vol 591-593 ◽

pp. 821-826 ◽

Cited By ~ 1

Author(s):

G.M.C. Silva ◽

E.A. Moreira ◽

M.D.M. Innocentini ◽

José Renato Coury

Keyword(s):

Pressure Drop ◽

Collection Efficiency ◽

Average Diameter ◽

Effective Diameter ◽

Gas Temperature ◽

Gas Velocity ◽

Permeability Constant ◽

Quartz Fiber Filter ◽

Superficial Gas Velocity ◽

Fiber Filter

Experimental results describing the pressure drop and collection efficiency of a quartz micro-fiber filter are presented in this study. The filter utilized had a porosity of 0.698 and mean fiber diameter of 1.1!m. For the tests performed, the filter was a disk with an effective diameter of 3 cm. The permeability tests of the filters were measured by varying the superficial gas velocity from 0.013 to 1.49m/s and the temperature from 26.5 to 666oC. The collection efficiency tests were accomplished for temperatures ranging from ambient to 700oC at a filtration velocity of 0.05 m/s. The test powder utilized was a phosphate rock concentrate with a density 2973 kg/m3 and average diameter of 4.6!m. The permeability test results showed that, for the same gas velocity, the pressure drop increased with the gas temperature. This dependence was reflected in the measured values of the permeability constant, k1, which increased with temperature. The experimental points were well fitted by a linear correlation. The filtration tests also showed a clear dependence between filter efficiency and test temperature: smaller filter efficiencies were obtained as the gas temperature was increased.

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Study on determination method of phthalates from indoor air by gas chromatograph tandem mass spectrometry technique (GC/MS)

VNU Journal of Science Natural Sciences and Technology ◽

10.25073/2588-1140/vnunst.4484 ◽

2017 ◽

Vol 33 (2) ◽

Author(s):

Tri Tran

Keyword(s):

Gas Phase ◽

Indoor Air ◽

Polyurethane Foams ◽

Determination Method ◽

Air Samples ◽

Mass Spectrometry Technique ◽

Quartz Fiber Filter ◽

Spectrometry Technique ◽

Standard Solution

In this report, the determination method of phthalates in indoor air has been studied. For air samples, the particulate phase was kept on a quartz fiber filter and the gas phase was collected on two polyurethane foams (PUFs) by a low speed pump during a period of 12 to 24 h. The target compounds were extracted from filter and PUFs by mixture of dichlomethane and n-hexane and performed on a GS/MS system. The method quantification limit of siloxane in the air samples ranged from 1 to 3 ng/m3, the linear range of standard solution was from 1 to 1000 ng/mL. The recoveries of method ranged from 67,9% to 117% with a RSD < 9% for both of analysis and surrogate compounds. The optimized method was applied for determination of siloxane in indoor air collected from Hanoi, Vietnam.

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