An in-needle solid-phase microextraction device packed with etched steel wires for polycyclic aromatic hydrocarbons enrichment in water samples.

A novel, low-cost and effective in-needle solid phase micro-extraction device was developed for the enrichment of trace polycyclic aromatic hydrocarbons in water samples. The in-needle solid phase micro-extraction device could be easily assembled by inserting hydrofluoric acid-etched wires, which were used as adsorbent, into a 22-gauge needle tube within spring supporters. Compared with the commercial solid phase micro-extraction fiber, the developed device has higher efficiency for the extraction of 4-6 rings of polycyclic aromatic hydrocarbons from water samples using the optimized extraction conditions. With gas chromatography equipped with a flame ionization detector, the limits of detection for the 4-6 rings of polycyclic aromatic hydrocarbons ranged from 0.0020 to 0.0067 ng/mL. The RSDs for one needle and needle-to-needle extractions were in the range of 5.2-9.9% (n = 5) and 3.4-12.3% (n = 5), respectively. The spiked recoveries of the polycyclic aromatic hydrocarbons in tap water samples ranged from 73.2% to 95.4%. This in-needle solid phase micro-extraction device could be a good field sampler because of less sample lose in longer store time. This article is protected by copyright. All rights reserved.