Study on the Vegetative Detritus Contribution to Beijing Urban PM<sub>2.5</sub> Using Cellulose as a Marker

Yi DING; Ting ZHANG; Shu-ping DONG; Xian-de LIU; Han-dong LIANG

Rock and Mineral Analysis > 2013 > 32(5): 738-746.

Yi DING, Ting ZHANG, Shu-ping DONG, Xian-de LIU, Han-dong LIANG. Study on the Vegetative Detritus Contribution to Beijing Urban PM_2.5 Using Cellulose as a Marker[J]. Rock and Mineral Analysis, 2013, 32(5): 738-746.

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Study on the Vegetative Detritus Contribution to Beijing Urban PM_2.5 Using Cellulose as a Marker

1.
College of Geosciences and Surveying Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
2.
National Research Center for Environmental Analysis and Measurements, Beijing 100029, China
3.
Chinese Research Academy of Environmental Sciences, Beijing 100012, China

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Received Date: May 08, 2013
Accepted Date: June 10, 2013
Published Date: September 30, 2013

Abstract

ABSTRACT

PM_2.5 pollution raises environmental concern in China and other countries worldwide. The marker technique is regarded as a reliable tool for atmospheric aerosol source tracing. Cellulose can be used as a marker to identify and evaluate vegetative detritus emission to primary aerosols. An analytical method for cellulose in the PM_2.5 has been modified because of its low content in PM_2.5 and the relative high procedure blank. The method combines an enzymatic cellulose hydrolysis procedure and a GOD-phenol-4-aminoantipyrene determination of formed glucose. The key parameters of the method were optimized as a delignification condition, temperature for cellulose enzymatic hydrolysis, amount of enzyme, pH value and hydrolysis reaction time. The method meets the requirements of cellulose determination of PM_2.5 with a detection limit of 0.26 μg/m³. A procedure blank of 36.5 μg glucose was obtained which is significantly lower than 53.8 μg for the previous method. Cellulose in 23 Beijing urban PM_2.5 collected from May 15th to June 28th, 2012 were analyzed. The detection rate of cellulose is 96%. The results show that the cellulose concentration in Beijing PM_2.5 is (0.573±0.17) μg/m³. The vegetative detritus contribution is 1.37%±0.65% of PM_2.5 mass concentration, or 4.4% in average and 9.2% in the maximum of PM_2.5 organic carbon, indicating vegetative detritus is a major contributor of urban aerosol organic carbon and has to be considered in source attribution studies. This method provides a new technique for urban atmospheric PM_2.5 source identification.
- atmospheric PM_2.5,
- marker,
- cellulose determination,
- vegetative detritus emission

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