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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(pHZPNC),零可变电荷点pH(pHzpvc),永久电荷密度(σp),可变电荷密度(σv)和净电荷密度(σT)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pHzpvc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CO32-对PT法测定结果的影响.“,”In this paper, the physical meaning of zero point of charge measured by acid-base potentiometric titration (PT) is discussed and it is considered to be zero point of net charge (ZPNC). The interrelations of ZPNC (pHZPNC), zero point of variable charge (PHZPVC), permanent charge density (σp), variable charge density (σy) and total net surface charge density (σT) are theoretically analyzed. The pHZPNC and σp of the nanoparticles of aluminum - magnesium hydroxide are determined by PT method. Effects of electrolyte and pH on various electrochemical parameters are investigated. In addition, effect of CO32- on the results obtained via PT method is also studied.