The ISO 10716:2022 standard specifies a method for the determination of alkali retention in paper and Cardboard. This method is suitable for products containing alkaline pigments or Miscellaneous alkaline substances, which are often used to improve the acid resistance of paper. Alkali retention is an important indicator of the chemical stability of paper, reflecting its resistance to degradation in acidic environments. By measuring alkali retention, the service life and preservation performance of paper and Cardboard can be evaluated, especially in the field of long-term preservation such as archives and books.