DIRECT DETECTION OF TRACE LEVELS OF URANIUM BY LASER-INDUCED KINETIC PHOSPHORIMETRY
DIRECT DETECTION OF TRACE LEVELS OF URANIUM BY LASER-INDUCED KINETIC PHOSPHORIMETRY
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DOI：
10.1021/ac00037a020
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发表时间：
1992-07-01
影响因子：
7.4
通讯作者：
MILLER, AG
中科院分区：
文献类型：
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作者：
BRINA, R;MILLER, AG
室温下动力学磷光法测定水溶液中铀酰离子的检出限为1 ng/L，与铀的检出限在5 mg/L范围内呈线性关系。该方法快速、准确，大多数实际样品无需分离前处理。在生物样品的分析中，需要用硝酸/过氧化氢湿法灰化，以便在检出限附近进行测量。铀浓度高于0.1mU·g/L的样品的相对标准偏差通常低于5%。在铀酰离子磷光的动力学分析中，考虑了影响铀酰离子磷光量子产率的因素，例如对存在于基质中的物种的猝灭。
The kinetic phosphorimetric determination of uranyl ion in aqueous solutions at room temperature yielded a detection limit for UO22+ of 1 ng/L. The response to uranium is linear from the detection limit up to 5 mg/L. The method is fast and accurate, with no separative pretreatment needed for most of the real samples investigated. In the analysis of biological samples, wet-ashing with HNO3/H2O2 is required for measurements near the detection limit. Samples with uranium concentrations higher than 0.1-mu-g/L gave relative standard deviations typically below 5%. Factors affecting the quantum yield of the uranyl ion phosphorescence, e.g. quenching from species present in the matrix, are accounted for in the kinetic analysis of the uranyl phosphorescence.