GB/T 12910 - 2023 Determination of titanium dioxide content in focused paper and Cardboard. The standard specifies the whole process from sample collection, processing to determination, covering Spectrophotometric method, spectrophotometry and other applicable detection methods, and clearly explains the selection of instruments and equipment, reagents, operation steps and data processing. Titanium dioxide content affects the whiteness, opacity and other performance of paper and Cardboard. This standard provides a unified determination method for the paper industry and related testing institutions, helping enterprises to accurately control the mass of products, ensure that paper products meet market demand, and promote the standardization and standardization of testing work in the paper and Cardboard industry.