Attapulgite modified magnetic metal-organic frameworks for magnetic solid phase extraction and determinations of benzoylurea insecticides in tea infusions.

摘要: Abstract Herein, we developed a novel magnetic solid phase extraction method based on attapulgite-modified metal-organic frameworks (ATP@Fe3O4@ZIF-8), and this could be used for the determination of benzoylureas when it was coupled with high-performance liquid chromatography. The established validated in terms linearity (2.5–500 μg L−1, correlation coefficient (R2) > 0.9994), accuracy (with satisfactory recovery 88.29–95.99%) precision relative standard deviation (RSD) less than 8%). In addition, enrichment factors (EF) ranged from 63.6 to 72.2. Limit detection (LOD) limit quantitation (LOQ) were 0.7–3.2 μg L−1 2.3–10.7 μg L−1, respectively. Moreover, there hardly any noticeable loss efficiency undergoes five cycles. Finally, successfully six different tea infusions determined recoveries 78.8 114.3%.