Selectivity of Glass electrode HG+M(sol)+M G+H(sol)(6r-11) ndt ka M (6-13) k: selectivity coefficient eolass =k+.0591lg(au++ka+) (6-14) E如m=K+00591!(am+∑kan)Selectivity of Glass electrode H +G - +M+ (sol) M+ G - + H + (sol)  + = + H M  k k: selectivity coefficient = + 0.0591lg( + + + ) glass H M E K  k = + 0.0591lg( + + + ) mi H i glass E K  k  (6-13) (6-14) (6r-11)