3 years ago

Subcritical water extraction combined with molecular imprinting technology for sample preparation in the detection of triazine herbicides

A selective, environmentally friendly, and cost-effective sample extraction method based on a combination of subcritical water extraction (SWE) and molecularly imprinted solid-phase extraction (MISPE) was developed for the determination of eight triazine herbicides in soil samples by liquid chromatography-tandem mass spectrometry (LC–MS/MS). In SWE, the highest extraction yields of triazine herbicides were obtained under 150°C for 15min using 20% ethanol as the organic modifier. Addition of MIP during SWE increased the extraction efficiency, and using MIP as a selective SPE sorbent improved the enrichment capability. Soil samples were treated with the optimized extraction MIP/SWE-MISPE method and analyzed by LC–MS/MS. The novel technique was then applied to soil samples for the determination of triazine herbicides, and better recoveries (78.9%–101%) were obtained compared with using SWE-MISPE (30%–67%). Moreover, this newly developed method displayed good linearity (R2 >0.99) and precision (2.7–9.8%), and low enough detection limits (0.4–3.3μgkg−1). This combination of SWE and MIP technology is a simple, effective and promising method to selectively extract class-specific compounds in complex samples.

Publisher URL: www.sciencedirect.com/science

DOI: S0021967317308440

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