摘要
对原来用元素分析仪测定大气颗粒物样品中有机碳、元素碳的方法[1 ] 进行改进 ,将差减法间接测定元素碳改为一步直接测定元素碳。有机碳、元素碳的测量标准偏差的平均值分别为 0 35 %、0 34% ,提高了元素碳的测量精度 ,同时避免了误差传递 ,解决了差减法测定元素碳时出现负值的情况。
The method for organic carbon(OC) and element carbon(EC) determination in particle matter(PM) was established by using Elemental Analyzer,the MT_5 CHN elements analyzer produced by Yanaco,Japan.The OC was determined directly at 450℃;the same sample was measured once more at 950℃,the EC value was thus obtained.The average of standard deviation in measurement of EC is 0.34%,and OC is 0.35%.by using laboratory standard samples of mixed two carbon species the accuracy of the method was (evaluated.)This method was compared with thermal_optical method based on Sunset instrument in the inter_laboratory comparison activities.
出处
《中国环境监测》
CAS
CSCD
北大核心
2004年第3期20-23,共4页
Environmental Monitoring in China
关键词
元素分析
颗粒物
元素碳
直接测定
elemental analysis
particle
element carbon
determined directly
