3Buck R P,Rondinini S,Covington A K,et al.Measurement of pH-Definition,standards and procedures[J].Pure Appl Chem,2002,74(11):2169-2200.
4Bates R G,Durst R A.Definition of pH scales,standard reference values,measurement of pH and related terminology[J].Pure & Appl Chem,1985,57(3):531-542.