GB/T 21933.3-2008 Determination of cobalt content in ferronickel by flame atomic absorption spectroscopy (AAS). First, the ferronickel sample is processed to make the cobalt element enter the solution. Using the Flame atomization device to atomize the cobalt, the absorption degree of cobalt atoms to specific wavelengths of light is measured by Light spectrum instrument, that is, Absorbance. According to the pre-constructed cobalt element standard Linear dispersion, the cobalt content is accurately calculated by Absorbance. The standard strictly regulates key links such as Sample Handling, instrument operation, and measurement environment, providing a reliable method for mass detection of ferronickel products, helping to control the cobalt content and ensure that the performance of ferronickel products meets relevant requirements.