The present invention provides a method of purifying .sup.68Ge/.sup.68Ga generator produced .sup.68Ga from Fe (III). The invention further relates to an automated system within an existing Gallea Synthia prototype that provides purification .sup.68Ga from various cations and preconcentrations of .sup.68Ga. In general, the present invention further depicts the use of an automated system for the production of .sup.68Ga-radiolabelled PET tracers with high specific radioactivity and a kit for purifying .sup.68Ge/.sup.68Ga generator produced .sup.68Ga from Fe (III).

The present invention provides a method of purifying .sup.68Ge/.sup.68Ga generator produced .sup.68Ga from Fe (III). The invention further relates to an automated system within an existing Gallea Synthia prototype that provides purification .sup.68Ga from various cations and preconcentrations of .sup.68Ga. In general, the present invention further depicts the use of an automated system for the production of .sup.68Ga-radiolabelled PET tracers with high specific radioactivity and a kit for purifying .sup.68Ge/.sup.68Ga generator produced .sup.68Ga from Fe (III).

Provided is method of extracting and separating gallium by emulsion liquid membrane. The method of extracting and separating gallium by emulsion liquid membrane includes preparation of the emulsion liquid membrane, extraction and deextraction. By establishing a proper emulsion liquid membrane system, gallium is selectively extracted from the gallium leaching solution. In the scheme of the present disclosure, chosen factors are optimized through fractional fractorial design and central composite design so as to obtain an optimal processing scheme. The influences of gallium solution/emulsion volume ratio, extractant concentration, H.sub.2SO.sub.4 concentration, emulsion stirring duration and emulsion stirring speed on the gallium extraction rate are studied, and efficient enrichment of gallium is achieved. Besides, reproducibility of the emulsion liquid membrane is also studied, and after demulsification, the separated oil is used again for experiments, without obvious difference from newly prepared emulsion liquid membrane.

Methods of synthesizing colloidal ternary Group III-V nanocrystals are provided. Also provided are the colloidal ternary Group III-V nanocrystals made using the methods. In the methods, molten inorganic salts are used as high temperature solvents to carry out cation exchange reactions that convert binary nanocrystals into ternary nanocrystals.