称取0.05 g 试样在520 ℃高温下灼烧30 min,除去石墨中的有机碳,然后用硝酸(1+1)处理,除去碳酸盐,加3g碳硫分析专用混合助熔剂,在高频红外碳硫仪上测定固定碳含量.与间接定碳法和非水滴定容量法进行对比试验,测定结果吻合较好.经国家一级标准物质(GBW03118、GBW03119和GBW03120)和石墨矿样品验证,方法的准确度为-0.11%~0.04%,精密度为0.52%~1.81%(RSD%,n=12),符合DZ/T0130-2016《地质矿产实验室测试质量管理规范(岩石矿物样品化学成分分析)》的要求.%A 0.05 g sample was burned at 520℃ for 30 min,to remove the organic carbon in graphite.Then the carbonates were removed with nitric acid(1+1) and by the addition of 3 g of the carbon and sulfur analytical special mixed flux, the fixed carbon content was measured on the high frequency infrared carbon sulfur instrument. The method is simple, rapid, accurate,and reliable. The method is in good agreement with the indirect carbon fixation and non-aqueous titration volumetric methods. National standard reference materials (GBW03118, GBW03119 and GBW03120) and graphite ore samples were used to verify the method,the accuracy ranged from -0.11% to 0.04%, the precision was 0.52%~1.81% (RSD%, n = 12), these indicators were in line with the DZ/T0130-2016《geological laboratory testing quality management specification (analysis of rock and mineral samples chemical composition)》requirements.
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