Quantitative Determination of Free Radical Content in Coal by Standard Curve Method

Chinese Journal of Magnetic Resonance ›› 2011, Vol. 28 ›› Issue (2): 259-264.

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Quantitative Determination of Free Radical Content in Coal by Standard Curve Method

ZHENG Rong-Ping¹, PAN Tie-Ying^1*, SHI Xin-Mei¹, ZHOU Li-Fang¹, LIU Rui-Min², ZHANG De-Xiang², GAO Jin-Sheng²

1. Analysis and Research Center, East China University of Science and Technology, Shanghai 200237, China；
2. College of Resource and Environment Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2010-09-22 Revised:2010-10-12 Online:2011-06-05 Published:2011-06-05
Supported by:
国家自然科学基金资助项目（20576039）, 国家高技术研究发展计划资助项目(“863”计划)（2006AA05Z314）和国家重点基础研究发展计划资助项目（2011CB201304）.

Abstract

Abstract:

Free radicals play important roles in the metamorphic process, spontaneous combustion, pyrolysis and liquefacton of coal. Accurate quantitative determination of the free radical content in coal is important in studying the mechanism of coal pyrolysis and liquefaction. In this work, the stability and repeatability of quantitative measurement of total free radicals in coal by ESR method were investigated. With a standard curve method, the RSD of both stability and repeatability were less than 4%. The linearity of the method was in the range of 6.12×10¹⁵~1.47×10¹⁷, and correlation coefficient above 0.99.

Key words: ESR, standard curve method, free radical, coal

CLC Number:

O482.53

ZHENG Rong-Ping, PAN Tie-Ying, SHI Xin-Mei, ZHOU Li-Fang, LIU Rui-Min, ZHANG De-Xiang, GAO Jin-Sheng . Quantitative Determination of Free Radical Content in Coal by Standard Curve Method[J]. Chinese Journal of Magnetic Resonance, 2011, 28(2): 259-264.

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Quantitative Determination of Free Radical Content in Coal by Standard Curve Method

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