Serious interference of dissolved organic compounds in the laser induced fluorimetric determination of uranium in water: a selective & sensitive method for the laser induced fluorimetric determination of uranium in water,Analytical Methods

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Serious interference of dissolved organic compounds in the laser induced fluorimetric determination of uranium in water: a selective & sensitive method for the laser induced fluorimetric determination of uranium in water
Analytical Methods ( IF 2.7 ) Pub Date : 2020/01/10 , DOI: 10.1039/c9ay02225b
P. K. Tarafder _{1,

2,

3,

4,

5} , R. K. Mondal _{1,

2,

3,

4,

5} , G. Chakrapani _{1,

2,

3,

5,

6}

Affiliation

In this report, serious negative interference of Dissolved Organic Compounds (DOCs) in the laser/LED fluorimetric determination of uranium in natural and waste waters has been amply demonstrated. The experiments exploring the effects of the concentration of individual DOCs on the fluorescence intensity of a fixed concentration of uranium(VI) were designed involving about 15 different DOCs, mostly being the degradation products of humic acid and lignin, and the corresponding results obtained were compared with the results obtained by applying the method to a host of (about 500) real natural water samples sampled from areas of diverse geological and environmental settings. The results were compared with those obtained by other standard methods. In most cases, the fluorescence signal increases substantially on destruction of the DOCs present in the water samples studied, depending on the contents of the DOCs and their respective complexing abilities. Woefully, determination of low contents of uranium in some of the natural water samples by the hitherto recommended/prescribed LIF or LED fluorimetric methods often entails a great deal of difficulty in the interpretation of analytical results obtained, in spite of the metal ion (uranium) being actually present in them in significant quantities. Based on the above study, an improved LIF/LED fluorimetric method has been developed, which is robust and highly effective for accurate and precise determination of uranium(VI) in any type of water sample.

中文翻译：

激光诱导荧光测定水中铀的过程中溶解有机化合物的严重干扰：激光诱导荧光测定水中铀的选择性和灵敏方法

在此报告中，已充分证明了溶解有机化合物（DOC）在激光/ LED荧光法测定天然废水和废水中的铀时会产生严重的负面干扰。探索单个DOC浓度对固定浓度铀（VI的荧光强度）影响的实验）设计了约15种不同的DOC，主要是腐殖酸和木质素的降解产物，并将获得的相应结果与通过将该方法应用于从区域采样的大量（约500份）真实天然水样获得的结果进行了比较不同的地质和环境环境。将结果与通过其他标准方法获得的结果进行比较。在大多数情况下，荧光信号随所研究的水样中存在的DOC的破坏而显着增加，具体取决于DOC的含量及其各自的络合能力。真可悲尽管迄今实际使用的是金属离子（铀），但通过迄今推荐的/规定的LIF或LED荧光法测定某些天然水样中的低铀含量，通常仍难以解释所获得的分析结果大量存在。在上述研究的基础上，开发了一种改进的LIF / LED荧光法，该方法鲁棒且高效，可以准确，准确地测定铀（VI）在任何类型的水样中。

更新日期：2020-02-13

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