Conclusion After impurity removal and concentration by two kind of membrane, Yinhuang medicinal broth lose a little ingredient, so the selection of membrane system is reasonable.
结论银黄水煎液经两种膜除杂、浓缩后，整体成分损失少，膜系统选择合理。
2
From such 3 aspects as temperature, concentration and impurity, the corrosion causes of stainless steel in WPA are discussed for the selection of materials.