中文摘要：

自由基在煤变质过程、煤自燃反应及煤热解和液化中发挥着重要作用,准确测量煤中自由基总量对于研究上述煤的反应机理具有一定的理论意义.由于单点法测量煤中自由基含量的准确度及精确度不够,该文通过考察ESR测定自由基含量的稳定性和重复性,尝试建立了标准曲线方法测定煤中的自由基含量,得到了满意的结果.稳定性实验的相对标准偏差（RSD）〈4%,重复性实验的相对准偏差（RSD）〈3%,自由基含量在本实验范围（6.12×1015~1.47×1017）内线性关系良好,相关系数〉0.99.实验结果表明,该方法对煤中自由基含量测定有很好的精密度和准确性.

英文摘要：

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.