Single-drop microextraction (SDME) and hollow-fiber membrane microextraction (HFME) belong to methods of the liquid-phase microextraction preconcentration of organic compounds. These methods are characterized by the low consumption of organic solvents, high preconcentration factors, simplicity, low cost, ease of combination with various chromatographic methods; processes of preconcentration and sample injection are combined in a single device. Since the emergence of SDME (1996) and HFME (1999), a large number of versions have been developed that differ in the preconcentration technique, nature of the extractants used, and combinations with methods for the subsequent determination of the preconcentrated substances. The popularity of these methods among the analysts is evidenced by many reviews that we have summarized in this publication.

单滴微萃取（SDME）和中空纤维膜微萃取（HFME）属于液相微萃取预浓缩有机化合物的方法。这些方法的特点是有机溶剂消耗量低，预浓缩系数高，操作简单，成本低，易于与各种色谱方法结合；预浓缩和进样过程结合在一个设备中。自 SDME（1996 年）和 HFME（1999 年）出现以来，已经开发了大量版本，它们在预浓缩技术、所用萃取剂的性质以及与随后确定预浓缩物质的方法的组合方面有所不同。我们在本出版物中总结的许多评论证明了这些方法在分析师中的流行。