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A new method is suggested for determining the stability constant of ternary surface complexes (TSC) at liquid-solid interfaces in natural water. Its basic principle is based on the rule of left-right shift (RLRS) of S-shaped curve, from which the peak-type curve of E(%) with the concentration of organic matter is obtained. The peak-type curve is further used to obtain the (ksAM/kSM) values by using respectively the method of equality of E(%) when [H2A] = [H2A]0 (1) and the method of [H2A]max (2). From the known KSM,the stability constant KSAM of liquid-solid interfacial ternary surface complexes can be obtained.