Uranium Analysis Using Luminescence Enhancing Oxidant
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Solution Overview
Problem
Current uranium analysis methods require complex and time-consuming pre-treatment processes to convert uranium in lower oxidation states to uranium(VI) and remove interfering materials, which complicates the detection of uranium concentrations, especially in samples with reductive metal ions or organic/inorganic materials.
Innovation Solution
A method involving the use of an oxidant composition, such as hydrogen peroxide or monopersulfate, is added to the sample to oxidize uranium(IV) to uranium(VI) and neutralize interfering materials, allowing for direct measurement of luminescence intensity or attenuation using laser-induced luminescence spectroscopy, followed by a standard addition method to calculate uranium concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex pre-treatment processes are used to convert uranium in lower oxidation states to uranium(VI) and remove interfering materials, then measurement precision is improved, but device complexity and analysis time increase
Solution Approach 1:
The patent changes the oxidation state parameter of uranium from lower oxidation states (IV, III) to VI using an oxidant, which enables direct luminescence measurement without complex pre-treatment. This parameter change simplifies the measurement process while maintaining accuracy by ensuring uranium is in the measurable oxidation state.
Solution Approach 2:
The patent introduces an oxidant as an intermediary substance that facilitates the conversion of uranium in lower oxidation states to uranium(VI). This intermediary enables the measurement process to work with complex samples without requiring complex pre-treatment procedures, thus reducing device complexity while maintaining measurement precision.
2Measurement precision
If complex pre-treatment processes are used to convert uranium in lower oxidation states to uranium(VI) and remove interfering materials, then measurement precision is improved, but analysis time increases
Solution Approach 1:
By changing the oxidation state parameter through the addition of an oxidant, the patent enables direct luminescence measurement without time-consuming pre-treatment steps. This parameter change reduces analysis time while maintaining measurement precision by ensuring uranium is in the measurable oxidation state.
Solution Approach 2:
The patent performs the oxidation action preliminarily by adding an oxidant before measurement, which converts uranium in lower oxidation states to VI in advance. This preliminary action simplifies subsequent measurement and reduces overall analysis time compared to complex multi-step pre-treatment processes.
3Measurement precision
If luminescence intensity measurement is used for uranium quantification, then measurement precision is improved, but the presence of reductive metal ions and organic/inorganic materials interferes with measurement
Solution Approach 1:
The patent converts the harmful interference from reductive metal ions and organic/inorganic materials into a beneficial effect by using an oxidant to oxidize these interfering substances. This transformation eliminates their harmful luminescence quenching effect while maintaining measurement precision through oxidized uranium(VI) luminescence measurement.
Solution Approach 2:
The oxidant acts as an intermediary that protects uranium luminescence measurement from interference by oxidizing reductive metal ions and organic/inorganic materials. This intermediary substance eliminates harmful factors while allowing accurate luminescence intensity measurement of uranium(VI).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the pre-treatment process, reduces analysis time, and enhances the accuracy of uranium concentration determination by increasing luminescence lifetime and intensity, enabling rapid and precise measurement of uranium concentrations in various samples.
Implementation Method 1
adding an oxidant composition to a detection target sample to oxidize uranium(IV) to uranium(VI)
Implementation Method 2
laser-induced luminescence spectroscopy
Implementation Method 3
Uranium(VI) (oxidation number: 6+) exhibits strong emission when the pulse laser is irradiated
Data Source
AI summary
According to the present invention, there is provided a method of determining a concentration of uranium including: a) a primary measuring step of measuring luminescence intensity or luminescence attenuation of uranium (VI) of an oxidant added sample obtained by adding an oxidant composition to a detection target sample; b) a secondary measuring step of adding different volumes of standard solution containing uranium (VI) having a predetermined concentration to a plurality of oxidant added samples, respectively, and then measuring luminescence intensity or luminescence attenuation of uranium (VI) contained in each standard solution added sample; and c) a calculating step of calculating a concentration of uranium (VI) contained in the detection target sample by a standard addition method based on the primary and secondary measurements. With the method for determining a concentration of uranium according to the present invention, the concentration of uranium may be further rapidly and accurately analyzed.