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%.