探讨了电位滴定(PT)法测定的零电荷点的物理意义,认为是零净电荷点(ZPNC).并对零净电荷点PH(pH_(ZPNC)),零可变电荷点pH(pH_(ZPVC)),永久电荷密度(σ_P),可变电荷密度(σ_V)和净电荷密度(σ_T)之间的关系进行了理论分析.用PT法测定了氢氧化铝镁纳米颗粒的pH_(ZPNC)和σp,探讨了电解质浓度和pH对各电化学性质的影响规律.另外,还考察了CO_3~(2-)对PT法测定结果的影响. The physical significance of the zero charge point measured by the potentiometric titration (PT) method was discussed and considered to be zero net charge point (ZPNC). The effects of zero charge point pH (pH_ (ZPNC) ZPVC), the permanent charge density (σ_P), the variable charge density (σ_V) and the net charge density (σ_T) were investigated theoretically.The pH_ (ZPNC) And σp, the influence of electrolyte concentration and pH on the electrochemical properties was also discussed.In addition, the effect of CO_3 ~ (2-) on the determination of PT was also investigated.