本文采用硫氰酸钾络合比色法，探讨了几种表面活性剂对Fe3+测定的作用。结果表明，非离子型表面活性剂曲拉通X－100，吐温-20均有极大的增效作用，而几种阴离子型表面活性剂则产生“褪色”效果。加入适量的曲拉通X－100时，测定的灵敏度及稳定性均较佳，其摩耳吸光系数高达6．02×105，较对照提高79．2％。在该条件下，测定的检出限为2．5μg，相关系数r=0．9992，相对标准偏差为3．4％，添加标准铁4．0～15．0μg，回收率为96．3％～105.9％，完全达到检测的要求。 In this paper, potassium thiocyanate complex colorimetric method to explore the effect of several surfactants on the determination of Fe3 +. The results showed that nonionic surfactant Triton X-100, Tween-20 have a great synergistic effect, while several anionic surfactants have a “fade” effect. When the appropriate amount of Triton X-100 was added, its sensitivity and stability were better, its Moore absorption coefficient was as high as 6.02 × 105, 79.2% higher than the control. Under these conditions, the detection limit was 2.5μg, the correlation coefficient was 0.9992, the relative standard deviation was 3.4%, the standard iron was 4.0-15.0μg, the recovery was 96.3% ~ 105.9%, fully meet the testing requirements.