GB/T 24992-2010 "Paper, board and pulps - Determination of arsenic content" specifies the hydride generation atomic fluorescence spectrometry method and the silver salt colorimetric method for determining arsenic content in paper, board, and pulps. The former is suitable for trace arsenic, while the latter is applicable to lower arsenic content. After digestion treatment of the sample, the absorbance or fluorescence intensity is measured according to the method. Standards such as GB/T 450 and GB/T 462 are referenced to standardize operations and calculations, ensuring accurate results.