用蒸馏水为萃取剂萃取出聚丙烯腈纤维中的DMSO,然后用紫外分光光度法测定其含量。测定的最佳线性浓度为:4．5× 10-10～1．6×10-9mol／L,DMSO最大吸收波长为208 nm, 检测限为1．9×10-9 mol/L,相关系数为0．999 8,相对标准偏差小于0．5％;与其它常用的测定方法相比,解决了从纤维中分离DMSO的难题,具有简便、快速、准确和低成本的特点。 DMSO in polyacrylonitrile fiber was extracted with distilled water as extractant and its content was determined by UV spectrophotometry. The optimum linear concentration was 4.5 × 10-10 ~ 1.6 × 10-9mol / L, the maximum absorption wavelength of DMSO was 208 nm, the detection limit was 1.9 × 10-9 mol / L, and the correlation coefficient Is 0.999 8. The relative standard deviation is less than 0.5%. Compared with other commonly used determination methods, the problem of separating DMSO from fibers is solved. The method is simple, rapid, accurate and low-cost.