Do you want to ask what the salt ion concentration of ce-sds is? The ce-sds salt ion concentration is 0.1%-0.5%. ce-sds, sodium dodecyl sulfate, is an anionic surfactant. Usually 10% (w/v) concentration, alkaline solution storage, working concentration is usually 0.1%-0.5%. Solubility is lower in high-salt solutions or solutions with high chaotropic sequence. Therefore, guanidine salts (such as the protein denaturant guanidine thiocyanate) cannot be mixed with ce-sds, otherwise it will cause precipitation of ce-sds.