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| 煤质样品中汞的直接测定 |
| Direct Determination of Mercury in Coal Samples |
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| DOI： |
| 中文关键词: 汞 DMA-80型直接测汞仪 冷原子吸收光谱法 煤质样品 |
| 英文关键词: Mercury DMA-80 Direct mercury technology CAAS Coal samples |
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| 中文摘要: |
| 采用DMA-80型直接测汞仪测定煤中汞含量，样品经过筛（100目）预处理，干燥温度和时间分别为200 ℃和30 s，分解温度和时间分别为650 ℃和90 s，基体元素对测定无明显干扰。方法在高质量浓度（0.200 mg/L～10.0 mg/L）和低质量浓度（0.400 μg/L～200 μg/L）范围内均线性良好，对0.100 g煤质样品的最低检出限为0.4 μg/kg，平行测定的RSD＜5%，加标回收率＞97%，与原子荧光法的测定结果相一致。 |
| 英文摘要: |
| DMA-80 direct mercury technology was applied to determine the concentration of mercury in coal samples.The sample was pretreated with a 100 mesh sieve before analysis.The optimized conditions of drying temperature and time are 200 ℃and 30 s,and decomposition temperature and time are 650 ℃and 90 s,respectively.There is no obvious interference of matrix elements on mercury analysis.The method shows good linearity in both higher concentration (0.200 mg/L～10.0 mg/L) and lower concentration (0.400 μg/L～200 μg/L) of mercury.For 0.100 g coal sample,the detection limit of 0.4 μg/kg was obtained.RSD of parallel determination is less than 5%,and the spiked recovery is more than 97%.The analytical results are in good agreement with the values measured by atomic fluorescence spectrometry. |
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