Thermosensitive polymer assisted metal–organic framework for the determination of phenoxy carboxylic acid herbicides in environmental water samples

A simple and efficient method for the determination of five phenoxy carboxylic acid herbicides (PCAs) in environmental water samples was developed based on thermosensitive polymer assisted metal–organic framework as the adsorbent for micro-solid phase extraction. Under the optimized working conditions, the linearity was in the concentration ranges of 5–300 μg L −1 with a determination coefficient higher than 0.9980, respectively. The limits of detection and limits of quantification were in the range of 0.34–0.55 μg L −1 and 1.13–1.83 μg L −1 , respectively. The intra-day and inter-day precision were in the range of 0.7–3.4 % and 2.6–3.5 %, respectively. The method was applied successfully to analyze PCAs in environmental water samples. The satisfactory relative recoveries (92.7 %–117.8 %) for the spiked samples in environmental water samples were achieved which demonstrated the proposed method has a potential application for the trace determination of PCAs from complex matrix. Besides, the developed method is proved to be simple, environmentally friendly and inexpensive.