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In this paper, we describe a facile approach—using silicate fibers immobilized with Eu(III) ions [Eu(III) fibers] as affinity probes—to rapidly sense tetracycline (TC) in complex samples. The fabrication of the Eu(III) fibers is straightforward: Simply immerse a silicate fiber into a glass tube containing Eu(III) and irradiate with microwaves (power, 900 W) for 30 s. The Eu(III) fibers selectively...