利用VarioELⅢ型元素分析仪测定了碳纤维中氮、碳和氢的含量。优化的试验条件为:称样量2.1~2.4 mg,加氧时间120s,燃烧管温度980 ℃。选用乙酰苯胺计算当天校正因子,方法用于碳纤维和石墨样品分析,含碳量在88.05%~99.46%之间,而在绝大多数样品中氮和氢的质量分数都小于0.30%。

Contents of nitrogen, carbon and hydrogen in carbon fiber were determined by the Vario EL Ⅲ elemental analyzer. The optimized experimental conditions were as follows: ① amount of sample: 2.1-2.4 mg; ② time of oxygen dosing: 120 s; ③ temperature of combustion tube: 980 ℃. Acetanilide was used to calculate the daily factor. The developed method could be applied to samples of carbon fiber and graphite, giving the contents of carbon in the range of 88.05%-99.46% with less than 0.30% of nitrogen and hydrogen in most of the samples.