The effective surface charge of col oidal particles is an important parameter for calculating inter-particle interaction potentials. In this study, we investigated the effective charge of seven kinds of polystyrene particles having different diameters and surface charges. Two methods, conductivity-number density relationships and conductometric titration, were used to measure the effective charges. The results obtained from the two different methods show smal variations of 7% . The effective charges were also calculated from empirical formulas and found to be twice as large as the experimental values, indicating these formulas cannot be universal y applied to al col oidal dispersions.% 胶体溶液中带电胶粒的有效电荷是计算粒子间相互作用势的一个重要参数。在本文中用电导率-粒子数密度关系法和电导滴定法分别研究了七种粒径及表面带电情况均不相同的聚苯乙烯粒子，结果显示两种测量方法得到的有效电荷数值具有较好的一致性，误差在7%以内。同时发现，经验公式计算的有效电荷差不多是实验值的2倍，表明文献中的经验公式对于本文所研究的胶体粒子体系不适用。
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