Modified stainless steel wires with superwettability for highly efficient in-tube solid-phase microextraction

Construction of different surface wettability is meaningful for the interaction between the sorbent sur-face and target components. In the current study, four kinds of stainless-steel wires (SSWs) with different hydrophobic/hydrophilic property were prepared and used as the absorbents to enrich the target com-pounds with different polarity. Comparative extraction of six non-polar polycyclic aromatic hydrocarbons (PAHs) and six polar estrogens was carried out by in-tube solid phase microextraction (IT-SPME). The re-sults showed that two SSWs with the superhydrophobic surfaces exhibited high extraction capacity to the non-polar PAHs with the superior enrichment factor (EF) in the range of 29-672 and 57-744, respectively. In contrast, the superhydrophilic SSWs demonstrated higher enrichment efficiency for the polar estrogens than other hydrophobic SSWs. On the basis of optimized conditions, a validated analysis method was es-tablished using six PAHs as model analytes for IT-SPME-HPLC. Acceptable linear ranges (0.5-10 mu g L -1) and low detection limits (0.0 056-0.32 mu g L -1) were achieved using the superhydrophobic wire modi-fied by perfluorooctyl trichlorosilane (FOTS). The relative recoveries spiked at 2, 5 and 10 mu g L -1 in the lake water samples were in the range of 81.5%-113.7%. The relative standard deviation (RSD) of intraday ( <= 0.8%, n = 3) and interday ( <= 5.3%, n = 3) tests demonstrated the good extraction repeatability for the same extraction tube. Satisfactory repeatability for the preparation of extraction tubes ( n = 3) was also obtained with the RSD values in the range of 3.6%-8.0%. (c) 2023 Elsevier B.V. All rights reserved.