This standard specifies the determination methods of leachable harmful substances in wall materials, including the determination methods of heavy metals elements, hexavalent chromium, anion, ph value, soluble total solids, chemical oxygen demand and formaldehyde. This standard is applicable to the determination of harmful substances in wall materials, covering the extraction and determination methods of various harmful substances, ensuring the compliance of materials in terms of safety and environmental protection. A number of national standards for chemical analysis and laboratory instrument use are cited, ensuring the scientificity and accuracy of the determination methods, such as the preparation of GB/T 601 chemical reagent standard titration solution, etc. The application of these standards ensures the Reliability and Comparability of the determination results of leachable harmful substances in wall materials, and provides effective technical support for product quality control.