methods of air sampling and analysis download free

methods of air sampling and analysis download free

Sumiita Singhal is currently reading it Sep 06, Tharunkumar added it Mar 26, Ananda Luthfiany added it Jun 24, Jyotirmoy Dey marked it as to-read Sep 07, Thao Nguyen marked it as to-read Jun 01, Sutapa Bhowmik marked it as to-read Jul 17, Anh marked it as to-read Jul 28, Dennis Sheila marked it as to-read Sep 04, Sutadi added it Sep 15, John Alberto added it Oct 03, Tungkim Duong marked it as to-read Oct 27, Madhukar Surve marked it as to-read Dec 13, Khanh Nguyen marked it as to-read Aug 23, Ttttrang73 marked it as to-read Apr 21, Le Ngoc marked it as to-read May 11, Denuded and nondenuded samples of organic carbon were highly correlated 0.

Detailed measurements of organic compounds coupled with accurate thermodynamic models that explain gas particle-phase relationships are necessary for measuring different aerosol compositions in various environments. Carbon, a large component of PM 30 to 40 percent , is often divided into several fractions, most commonly organic carbon and elemental carbon. Elemental carbon, the black, light-absorbing fraction, is measured by many.

Some of the more detailed carbon fractions have been found to represent different source contributions Chow et al. Fung et al. This comparison showed that different carbon analysis methods can vary markedly as a function of the composition and concentration of the sample. Both protocols sample air through quartz-fiber filters. Punches from these filters are then submitted for analysis Chow et al.

The two methods differ in terms of combustion temperatures, analysis durations, and optical monitoring. When the cross-sections of the filter punches were examined: 1 charring was found throughout the filter, either from adsorbed organic vapors during sampling or adsorbed vaporized particles during analysis or liquid organic particles; 2 elemental carbon near the filter surface evolves earlier than some of the charred organic carbon embedded in the filters during thermal analysis; and 3 charred organic carbon attenuates red laser light more efficiently than elemental carbon Chow et al.

Many operating parameters can individually or collectively cause variations of up to 30 percent in test results. These include differences in combustion atmospheres, temperature ramping rates, and temperature plateaus. Unfortunately, no systematic research is being done to resolve these discrepancies.

Such research should include: 1 a review and evaluation of the published literature, much of which is not in the air-quality journals; 2 documentation of the method used, especially for thermal evolution carbon comparisons with different combustion temperatures, residence times, ramp rates, and optical-pyrolysis corrections; 3 establishment of standards for different sources of black carbon e. The dashed line indicates the correspondence.

Source: Chow et al. China is a large, diverse country with many local, urban, regional, and international pollution problems for which there are no simple solutions. In this paper we have presented some possible starting points for PM monitoring and assessments. Chen, L. Chow, W. Arnott, H. Journal of Aerosol Science. In press. Chow, J. Measurement methods to determine compliance with ambient air quality standards for suspended particles. Journal of the Air and Waste Management Association 45 5 : — Landsberger and M.

Amsterdam: Gordon and Breach Science. Review of PM 2. Energy and Fuels 16 2 : — Watson, L. Pritchett, W. Pierson, C. Frazier, and R. Atmospheric Environment 27A 8 : — Watson, M. Green, D. Lowenthal, D. DuBois, S. Kohl, R.

Egami, J. Gillies, C. Rogers, C. Frazier, and W. Journal of the Air and Waste Management Association 49 6 : — Watson, D. Crow, D. Lowenthal, and T. Merrifield, T. Aerosol Science and Technology 34 1 : 23— Engelbrecht, J. Watson, W.

Wilson, N. Frank, and T. Article Views Altmetric -. Citations PDF KB. Note: In lieu of an abstract, this is the article's first page.

Cited By. This article is cited by 14 publications. Rao and Jeffrey L. Massima Mouele, Olanrewaju Ojo. Fatoba, Omotola Babajide, Kassim O. Badmus, Leslie F. Privacy Policy Cookie Notice Terms and Conditions WorldCat is the world's largest library catalog, helping you find library materials online. Don't have an account? Your Web browser is not enabled for JavaScript.

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