ig a m(oH)pH(p158 18 Ia aMoH)16 Zi 14 Pb 12 10 86420 e 8101214 pH5 0 2 4 6 8 10 12 14 16 18 0 2 4 6 8 10 12 14 pH Al FeIII Bi Zn Pb Cd Cu FeII lg α M(OH) ～pH (p158) lg α M(OH)