Abstract:

The gold content in the ore is usually determinated by atomic absorption or volumetric method using the aqua regia dissolution method to generate gold chloride acid firstly,whose stability easily affected by temperature,acidity,concentration external conditions and container adsorption.In this paper，the method using gold chloride sodium instead of gold chloride acid for the determination of gold in ore content was developed.The standard solution prepared by the method was placed for three or four months still not turn to lower reduction.In this method,gold was enriched by activated carbon adsorption column，dissolved in aqua regia，and then gold chloride of sodium was prepared by adding the saturated sodium chloride solution.The determination of gold content was processed using the atomic absorption method in the Hitachi Z-2000 atomic absorption spectrophotometer.The experiments showed that the method is reliable，and owns small error and good stability.Depended on the absolute determination sensitivity of 0.025 μg/g and measuring range of 0.04～1 000 μg/g，this method was suitable for the gold determination in large quantities of geological ore samples.

Key words: Activated carbon adsorption, Auric sodium chloride, Atomic absorption, Gold