高频燃烧-红外吸收法测定金属铪中 碳含量研究

称取0.5 g金属铪样品置于瓷坩埚中，加入0.3 g纯铁和1.5 g钨锡粒助熔剂，设定高频燃烧红外碳分析功率为80%，吹扫和延迟时间均为10 s，比较水平为2，以钢铁碳标准物质样单点校准设备，绘制校准曲线，并用标准物质验证曲线准确性，建立金属铪中碳含量的测定方法，测量范围为0.001%~0.040%。采用该方法对2个厂家的金属铪中碳含量进行测定，测定结果的相对标准偏差不大于8%，在2个金属铪样品中加入钢铁碳标样进行加标回收试验，回收率在85%~106%之间。

Carbon Determination in Hafniummetal by High Frequency Combustion Infrared Absorption Method

0.5 g of sample, 0.3 g of pure iron and 1.0 g of tungsten-tin particles were added into the crucible. The instrumental parameters were set as follows:the high frequency poweris 80%, both the purge and delay time is 10 s, and the comparator level is 2. The single-point calibration curve was established using the standard sample of carbon in steel and it was confirmed by another standard sample. As a result, the determination method of carbon in hafniummetal by high frequency combustion-infrared absorption method was established, with the determination range of 0.001%~0.040%. The proposed method was applied to the determination of carbon in two kinds of hafniummetal samples from different companies. The relative standard deviations (RSD) of determination results were not larger than 8%. In addition, standard sample of steel was added to two samples of hafnium metal to carry out recovery tests. The results show that the recovery rate was between 85% and 106%.