Facile preparation of stainless steel microextraction fiber via in situ growth of metal–organic framework UiO-66 and its application to sensitive analysis of polycyclic musks

A functional stainless steel microextraction fiber easily prepared by in situ growing metal–organic framework UiO-66 was presented and used for high-performance analysis of polycyclic musks. Via the robust Ag-SH bonding reaction, mercaptoacetic acid was easily anchored on Ag film to provide carboxyl group on the stainless steel fiber, then in situ grown UiO-66 was fulfilled via the coordination reaction between Zr 4+ and carboxyl group. Good characteristics including large surface area, high thermal stability, and good adsorption property were achieved. Sensitive detection limits (0.015–0.040 ng/L) were achieved for polycyclic musks by coupling with gas chromatography with mass spectrometry, and it could be stable enough for 150 extraction cycles without a significant loss of extraction efficiency. Compared with the classical commercial fibers, 2.2–11.4 times higher enhancement factors were shown. Applied to the analysis of fortified river water samples, five typical polycyclic musks were well detected with the recoveries of 90.2–101.8%, respectively. It showed a facile approach for preparing stainless steel microextraction fiber via chemically bonding in situ grown metal–organic framework for high-performance enrichment.