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This paper established a high-temperature infrared method to determine the total carbon in nuclear grade boron carbide. The optimal experimental conditions were determined by studying the testing temperature，sample weight，selection of flux，and flux coverage method. At the same time, accuracy，precision，detection limit and quantification limit of the method were determined. The results show that the optimal testing temperature is 1 400 ℃，which not only ensures the release of total carbon but also extends the service life of the instrument. The optimal sample weight is 20-30 mg. Tin particles has the best melting effect，and boron carbide has the highest carbon release efficiency. The best coverage method was found to be 0.4 g tin particle + boron carbide + 0.6 g tin particle，and the carbon in boron carbide was totally released. The high-temperature infrared method for determining total carbon in nuclear grade boron carbide is good in accuracy and precision，the test results of boron carbide certified reference material are all within the uncertainty range of the certified value, while the RSD is<1.5 %, and the detection limit of the method is 0.001 9 %. This method is simple and fast，it can meet the requirements for measuring total carbon in nuclear grade boron carbide.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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