Testing the leaching solution once or twice a day is adequate. Monitoring the difference in gold content between rich and poor solutions indicates the adsorption by the activated carbon; a significant difference suggests effective adsorption.
The leaching solution should be tested diligently, with tests conducted 1-2 times daily for pH, reagent concentration, and gold-silver content. The remaining capacity of the activated carbon for adsorption can be determined by the gold content in the poor solution after passing through the activated carbon. If the gold content in the poor solution is high, it indicates that the activated carbon is saturated and should be replaced promptly.