指定组件的性质和特性以及相应的测试方法。描述水溶性酸、盐含量和可萃取含量（干物质和水含量）的测定以及结果的表达。

Specifies the nature and properties of the components together with the corresponding test methods. Describes the determination of water-soluble acids, the salt content, and the extractable content (dry matter and water content) as well as the expression of results.