Detection of uranium in industrial and mines samples by microwave plasma torch mass spectrometry.
Detection of uranium in industrial and mines samples by microwave plasma torch mass spectrometry.
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DOI：
10.1002/jms.3741
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发表时间：
2016-02
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影响因子：
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通讯作者：
Yi Li;Meiling Yang;Rong Sun;Tao Zhong;Huanwen Chen
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文献类型：
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作者：
Yi Li;Meiling Yang;Rong Sun;Tao Zhong;Huanwen Chen
微波等离子体炬（MPT）作为原子发射光谱法的传统光源，已被广泛使用的离子阱质谱仪用作各种地下水样品中铀的灵敏检测的环境电离源。在负离子检测模式下获得的全扫描质谱中，铀信号以硝酸铀酰络合物（例如[UO 2（NO3）3 ]（-））为特征，其在串联质谱实验中产生特征片段，使得无需样品预处理即可可靠地检测水样中的痕量铀。在最佳实验条件下，该方法的线性范围为10-1000 μg·l（-1），检出限为31.03 ng·l（-1）。在100 µg·l（-1）浓度下，给定样品的相对标准偏差（RSD）值为2.1-5.8%。方法已用于实际矿井水中铀的直接测定，回收率为90.94-112.36%。单个样品的分析在30 s内完成，显示出该方法具有提高通量的痕量铀的灵敏检测的有前途的潜力。
Microwave plasma torch (MPT), traditionally used as the light source for atomic emission spectrophotometry, has been employed as the ambient ionization source for sensitive detection of uranium in various ground water samples with widely available ion trap mass spectrometer. In the full-scan mass spectra obtained in the negative ion detection mode, uranium signal was featured by the uranyl nitrate complexes (e.g. [UO2 (NO3 )3 ](-) ), which yielded characteristic fragments in the tandem mass spectrometry experiments, allowing confident detection of trace uranium in water samples without sample pretreatment. Under the optimal experimental conditions, the calibration curves were linearly responded within the concentration levels ranged in 10-1000 µg·l(-1) , with the limit of detection (LOD) of 31.03 ng·l(-1) . The relative standard deviations (RSD) values were 2.1-5.8% for the given samples at 100 µg·l(-1) . The newly established method has been applied to direct detection of uranium in practical mine water samples, providing reasonable recoveries 90.94-112.36% for all the samples tested. The analysis of a single sample was completed within 30 s, showing a promising potential of the method for sensitive detection of trace uranium with improved throughput.