This standard applies to the determination of trace copper ions in edible salt, industrial salt and Miscellaneous salt products, and the determination range is 0.02 mg/kg to 2.0 mg/kg. Determination by flame Atomic absirption spectropho-tometry, AAS, after treating the sample with a complexing agent, copper ions were extracted with methyl isobutyl ketone and measured at 324.8 nm wavelength. The standard provides detailed instructions on reagent preparation, Sample Handling and determination procedures to ensure the accuracy of the results.