Novel ion exchange chromatography method for nca arsenic separation.

Area of Science:

• Radiochemistry
• Analytical Chemistry
• Nuclear Chemistry

Background:

• Isotope separation is crucial for nuclear research and applications.
• Germanium dioxide (GeO₂) is a common target material for producing arsenic isotopes.
• Efficient and high-purity separation methods are needed for radiochemical studies.

Purpose of the Study:

• To develop and validate a method for isolating the neutron-deficient isotope ⁷⁷As from reactor-irradiated ^natGeO₂.
• To verify the oxidation state of ⁷⁷As during the separation process.
• To assess the applicability of the method for separating other arsenic isotopes, such as ⁷⁴As.

Main Methods:

• High-performance liquid chromatography (HPLC) using an anion exchange column.
• Thin layer chromatography for oxidation state verification.
• Gamma measurements for radionuclidic purity assessment.

Main Results:

• The developed HPLC method successfully isolated ⁷⁷As from reactor-irradiated ^natGeO₂.
• The oxidation state of ⁷⁷As was confirmed during the separation.
• A high radionuclidic purity of 99.91% was achieved for the separated ⁷⁷As fraction.
• The method was also effective for separating ⁷⁴As from cyclotron-irradiated ^natGeO₂.

Conclusions:

• An efficient and high-purity method for ⁷⁷As separation from ^natGeO₂ was established using HPLC.
• The method's versatility was demonstrated by its successful application to ⁷⁴As separation.
• This technique provides a valuable tool for obtaining high-purity arsenic isotopes for research.