Selective Preconcentration of Gold from Ore Samples

Area of Science:

• Analytical Chemistry
• Environmental Science
• Materials Science

Background:

• Gold analysis in ore samples requires efficient preconcentration techniques.
• Selective chelating agents and solid sorbents are crucial for accurate metal determination.
• Existing methods may lack selectivity or require complex interference removal.

Purpose of the Study:

• To develop a simple and selective method for gold preconcentration in ore samples.
• To investigate the sorption behavior of gold using DEBT-impregnated Amberlite XAD-16 resin.
• To determine gold concentrations with high accuracy and a significant preconcentration factor.

Main Methods:

• Utilizing N, N-diethyl-N"-benzoylthiourea (DEBT) as a chelating agent and Amberlite XAD-16 as a solid sorbent.
• Optimizing batch and column processes for gold sorption and elution.
• Employing flame atomic absorption spectrometry (FAAS) for quantitative gold analysis.

Main Results:

• The DEBT-impregnated resin exhibited a gold ion capacity of 33.48 mg g^-1.
• Optimized conditions allowed for the determination of gold at 0.015 μg mL^-1 with a preconcentration factor of 6.7.
• Validation using certified reference materials yielded satisfactory results with a relative standard deviation (RSD) of 7.6%.

Conclusions:

• The developed method is simple, selective, and effective for gold preconcentration in ore samples.
• The method eliminates the need for interference elimination processes, simplifying analysis.
• This approach offers a reliable tool for accurate gold determination in geological materials.