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Aiming at the problems of low pre-treatment efficiency and significant mass spectrometry interference in the determination of rare earth elements in coal-related samples, a method for the determination of rare earth elements in coal and fly ash samples by high-temperature and high-pressure microwave digestion-ICP-MS in a mixed acid system of HNO3-HF-HClO4-H2SO4 was established. The effects of pre-treatment methods, sample weight, digestion system and mass spectrometry interference on the determination results were investigated. The results show that the linear correlation coefficients of the calibration curves are all greater than 0.999 6, the detection limits are 0.003 7~0.042 μg/g, the relative standard deviations (RSD, n=11) of the determination results of each element are all within 5.85%, the recoveries of standard addition are 95.0%~107.2%, and the relative errors are all less than 6.95%. The method has high accuracy and good stability, which greatly improves the determination efficiency.
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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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