Low-cost and convenient ballpoint tip-protected liquid-phase microextraction for sensitive analysis of organic molecules in water samples
2017; Elsevier BV; Volume: 1006; Linguagem: Inglês
10.1016/j.aca.2017.12.037
ISSN1873-4324
AutoresBaocheng Ji, Bing Xia, Xianpeng Fu, Lei Shan, Ye Ye, Yan Zhou,
Tópico(s)Analytical Chemistry and Chromatography
ResumoSimplification and miniaturization in analytical procedures are highly preferred by analysts and other researchers. In this study, a low-cost, convenient and efficient liquid-phase microextraction method, termed ballpoint tip-protected liquid-phase microextraction (BT-LPME), was established. The bullet-shaped BT possessed a hollow cavity of several microliters for solvent storage and an opening tail for solute extraction. Magnetic field-induced BT spinning significantly accelerated the extraction process. By virtue of the adhesion between a stainless steel sheath and an organic solvent, along with cave protection, finely stable storage of extractant was achieved even under high spinning speeds (>1000 rpm). The BT-LPME performance was evaluated by extracting five polycyclic aromatic hydrocarbons (PAHs) from aqueous solution, followed by gas chromatography-mass spectrometry (GCMS) analysis. Compared to static single drop microextraction (SDME), the BT-LPME method provided higher enrichments (128–173-fold) for the five PAHs. Good linearities (from 0.01∼0.05 μg L−1 to 50 μg L−1) with a regression coefficient (r2) ≥0.9993, as well as low limits of detection (LODs, 0.002–0.011 μg L−1) and limits of quantification (LOQs, 0.007–0.023 μg L−1), were obtained. Relative recoveries varied from 92.3% to 103.4% at three spiked levels of 0.1, 1 and 10 μg L−1. The BT-LPME technique was also successfully applied to the enrichment of other organic compounds, such as organophosphorus compounds, organochlorines and triazines.
Referência(s)