对热光反射法测量黑碳的误差校正

A non-negligible bias of the thermaloptical reflectance method in carbon measurement and its correction

通过对3种不同类型样品的黑碳测量,获取热光反射法测量黑碳时的误差校正方法,得到3点结论:截距的产生可能和仪器有关,但不是系统误差,和样品特性有关,与样品量无关;对气溶胶样品来说,所测碳含量与样品量有很好的线性相关关系,截距产生的误差对结果的影响不容忽视,采用不同样品量求结果与样品量线性相关直线斜率的方式获得黑碳是有必要的;截距产生的误差对样品中黑碳含量的测量有影响,但不影响其在序列上的变化趋势.

Three different type samples were chosen to measure the BC content by the TOR method and the conclusions were that the the intercept of regression line between the BC content and the sample mass might be relative with the instrument and the sample characteristics. Any systematic error that occourred had no nothing to do with the sample mass; for aerosol samples, there were good relationships between the BC content and the sample mass. The error caused by the intercept could not be neglected. So it was necessary to use the slope of regression line between the BC content and the sample mass as the BC content result and the intercept might influence the BC results;it did not affect the trend in the sequence.