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Influence of Gamma Irradiation on Uranium Determination by Arsenazo III in the Presence of Fe(II)/Fe(III)

Influence of Gamma Irradiation on Uranium Determination by Arsenazo III in the Presence of Fe(II)/Fe(III)

Zhong Zheng, Mingliang Kang, Chunli Wang, Chunli Liu, Bernd Grambow, Lara Duro, Tomo Suzuki-Muresan

Chemosphere. 2014 Jul;107:373-378.

PMID: 24485811

Abstract:

Arsenazo III is a widely used reagent for the concentration measurement of uranium and other actinides in aqueous samples. This study indicates that, for routine aqueous samples, due to the strong complexing ability with Arsenazo III, Fe(III) can significantly decrease the UV-Vis absorbance of the U(VI)-Arsenazo III complex, whereas the influence of Fe(II) on the absorbance is negligible. However, when Fe(II) is present in a gamma-irradiated U(VI) aqueous sample, it can give rise to the Fenton reaction, which produces oxidizing radicals that decompose the subsequently added Arsenazo III, leading to a sharp decrease in the absorbance of the U(VI)-Arsenazo III complex. The decrease in absorbance depends on the iron content and irradiation dose. Furthermore, the oxidizing radicals from the Fenton reaction induced by gamma irradiation can be continually produced. Even if the irradiated solution has been aged for more than one month in the absence of light at room temperature and without the exclusion of oxygen, the reactivity of the radicals did not decrease toward the subsequently added Arsenazo III. This finding demonstrates that the presence of Fe(II) in gamma-irradiated U(VI) aqueous samples can lead to incorrect U(VI) measurement using the Arsenazo III method, and a new method needs to be developed for the quantitative determination of U(VI) in the presence of gamma radiation and ferrous iron.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1668004	Arsenazo III		1668-00-4	Price

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