State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, Hubei, China.
School of Environmental Studies, China University of Geosciences, Wuhan, 430074, Hubei, China.
Anal Bioanal Chem. 2021 May;413(11):3005-3015. doi: 10.1007/s00216-021-03236-4. Epub 2021 Mar 24.
Exploring commercial and inexpensive sorbents for extraction of organic pollutants is still an active area of research. Ultrahigh molecular weight polyethylene sieve plate (UMPESP) is a commercially available, low-cost, and porous frit, which has been widely used in solid-phase extraction cartridges to fix the filling materials. In this work, UMPESP was investigated for the extraction of polycyclic aromatic hydrocarbons (PAHs) from water samples. The desorption and sorption efficiencies of UMPESP were first evaluated and compared with two previously reported sorbents, low-density polyethylene plastic pellet (LDPEP) and silicone rod (SR). The comparative results showed that quantitative desorption of analytes from UMPESP, which could be easily achieved with 2 × 1.5 mL n-hexane, was more effective than that of LDPEP (>6 × 1.5 mL n-hexane) and comparable to that of SR. Additionally, shorter equilibrium time was rendered by UMPESP (shaking for 120 min) compared with SR (>480 min), due to the porous structure and larger surface area of the former. Different parameters that affect the extraction efficiency, including organic modifier, ionic strength, and pH value, were then studied. The optimized method coupled with gas chromatography-mass spectrometry afforded good linearity in a concentration range of 10-5000 ng L (except acenaphthene in the range of 25-5000 ng L) with coefficients of determination ranging from 0.9957 to 0.9995 and relative standard deviations below 13.8%. The limits of detection and quantification were 0.04-3.35 ng L and 0.13-11.16 ng L, respectively. Finally, the method was successfully applied to determine PAHs in real water samples, and the results showed no statistically significant difference with the concentrations derived from liquid-liquid extraction.
探索用于提取有机污染物的商业且廉价的吸附剂仍然是一个活跃的研究领域。超高相对分子质量聚乙烯筛板（UMPESP）是一种市售的、低成本的多孔 frit，已广泛用于固相萃取小柱中固定填充材料。在这项工作中，研究了 UMPESP 从水样中萃取多环芳烃（PAHs）的性能。首先评估并比较了 UMPESP 的解吸和吸附效率，与两种之前报道的吸附剂（低密度聚乙烯塑料颗粒（LDPEP）和硅树脂棒（SR））进行了比较。比较结果表明，从 UMPESP 上定量解吸分析物，用 2 × 1.5 mL 正己烷即可轻松实现，比 LDPEP（> 6 × 1.5 mL 正己烷）更有效，与 SR 相当。此外，由于前者具有多孔结构和更大的表面积，因此 UMPESP （摇动 120 分钟）达到平衡的时间更短，而 SR 则需要更长的时间（> 480 分钟）。然后研究了影响萃取效率的不同参数，包括有机溶剂添加剂、离子强度和 pH 值。优化后的方法与气相色谱-质谱联用，在 10-5000 ng L 浓度范围内（除苊在 25-5000 ng L 范围内）得到了良好的线性，相关系数范围为 0.9957 至 0.9995，相对标准偏差低于 13.8%。检出限和定量限分别为 0.04-3.35 ng L 和 0.13-11.16 ng L。最后，该方法成功应用于实际水样中 PAHs 的测定，结果与液液萃取得到的浓度无统计学显著差异。
