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Polypropylene hollow fibers (PPHFs) are usually applied for HF liquid-phase microextraction and have proved effective in various applications. By modifying PPHFs with sorbents, they can be used for solid-phase microextraction, and the method is novel, efficient and economical. This article mainly reviews the modification of PPHFs using carbon nanotubes, graphene, ceramic metal oxides and self-synthesized...
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