Green analytical chemistry principles should be followed, as much as possible, and particularly during the development of analytical sample preparation methods. In the past few years, outstanding materials such as ionic liquids, metal-organic frameworks, carbonaceous materials, molecularly imprinted materials, and many others, have been introduced in a wide variety of miniaturized techniques in order to reduce the amount of solvents and sorbents required during the analytical sample preparation step while pursuing more efficient extraction methods. Among them, magnetic nanomaterials (MNMs) have gained special attention due to their versatile properties. Mainly, their ability to be separated from the sample matrix using an external magnetic field (thus enormously simplifying the entire process) and their easy combination with other materials, which implies the inclusion of a countless number of different functionalities, highly specific in some cases. Therefore, MNMs can be used as sorbents or as magnetic support for other materials which do not have magnetic properties, the latter permiting their combination with novel materials. The greenness of these magnetic sorbents in miniaturized extractions techniques is generally demonstrated in terms of their ease of separation and amount of sorbent required, while the nature of the material itself is left unnoticed. However, the synthesis of MNMs is not always as green as their applications, and the resulting MNMs are not always as safe as desired. Is the analytical sample preparation field ready for using green magnetic nanomaterials? This review offers an overview, from a green analytical chemistry perspective, of the current state of the use of MNMs as sorbents in microextraction strategies, their preparation, and the analytical performance offered, together with a critical discussion on where efforts should go.

应尽可能遵循绿色分析化学原理，尤其是在分析样品制备方法的开发过程中。在过去的几年中，杰出的材料，例如离子液体，金属有机骨架，碳质材料，分子印迹材料以及许多其他材料，已被引入各种小型化技术中，以减少所需的溶剂和吸附剂的数量。在分析样品制备步骤中，同时寻求更有效的提取方法。其中，磁性纳米材料（MNMs）由于具有多种用途而倍受关注。主要是通过外部磁场将它们与样品基质分离的能力（从而大大简化了整个过程），并且易于与其他材料组合，这意味着要包含无数种不同的功能，在某些情况下这些功能是高度特定的。因此，MNM可用作其他不具有磁性的材料的吸附剂或磁性载体，后者允许它们与新型材料结合。这些磁性吸附剂在微型化萃取技术中的绿色通常是根据其易于分离和所需吸附剂的量来证明的，而材料本身的性质却并未引起人们的注意。但是，MNM的合成并不总是像其应用程序那样绿色，并且生成的MNM也不总是像所需的那样安全。分析样品制备领域是否准备好使用绿色磁性纳米材料？这篇评论从绿色分析化学的角度提供了概述，