To find appropriate evaluation method which is used to evaluate the scale performance of inhibitor is important to select out reverse osmosis inhibitor（ROI） with excellent performance.Conductivity method is used to evaluate the effectivity of three kinds of ROI and the solution volume of Na2CO3 consumed when the conductance mutation of the solution occur with different content of ROI is discussed.Then the relative supersaturation of CaCO3 is calculated.The performance of different kind of ROI and the best concentration of ROI are evaluated by the curve of relative supersaturation of CaCO3-ROI concentration.%选择合适的评定方法评价阻垢剂的阻垢性能对快速筛选性能优良的反渗透阻垢剂具有十分重要的意义。文章采用电导率法评定了三种反渗透阻垢剂的性能,研究了不同加药浓度下试验溶液的电导率发生突变时消耗的Na2CO3溶液的体积,并求解CaCO3的相对过饱和度;根据CaCO3的相对过饱和度与各阻垢剂浓度之间的关系曲线,评价了它们的阻垢性能优劣以及最佳加药浓度。
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