背景:液晶单体(LCM)已被归类为新兴的有机污染物。有效的分离和提取是确定的关键步骤,然后了解环境水域中LCMs的发生和分布。然而,报道的样品制备技术仍然遭受一些困境,例如使用大量的有机溶剂,提取能力低,繁琐的操作程序和昂贵的萃取塔的使用。为了规避缺点,新的提取形式和吸附剂,减少有机溶剂的消耗,对于LCM的分析,应开发出优越的提取性能和低成本。
结果:使用1H,1H,2H,2H-丙烯酸十七氟癸酯和9-乙烯基蒽作为混合功能单体,通过一锅法水热技术制备了任务特异性磁性吸附剂(TSMA),用于在磁固相萃取(MSPE)格式下高效捕获LCM。由于官能团丰富,开发的TSMA/MSPE对LCM具有令人满意的捕获性能。获得了令人满意的富集因子(132-212)和高吸附容量(18mg/g)。此外,通过密度泛函理论计算和吸附动力学和吸附等温线实验相结合的方法研究了吸附机理。在有利的条件下,通过将TSMA/MSPE与配备二极管阵列检测器(DAD)的HPLC相结合,建立了一种灵敏可靠的监测环境水域中研究LCM的方法。检测限和加标回收率分别为0.0025-0.0061μg/L和81.0-112%,分别。最后,所开发的方法用于监测九龙江北溪流域的LCMs水位。
■当前的研究为快速有效地捕获痕量LCM提供了一种新的吸附剂。此外,一个敏感的,建立了可靠的反干扰监测方法,用于实际水域中痕量LCMs的监测。此外,首先,内容,根据所开发的方法,研究了北溪流域LCM的发生和分布。
BACKGROUND: Liquid crystal monomers (LCMs) have been classified as emerging organic pollutants. Efficient isolation and extraction is a critical step in the determination, and then knowing the occurrence and distribution of LCMs in environmental waters. However, the reported sample preparation techniques still suffer some dilemmas such as using large amount of organic solvent, low extraction capacity, tedious operation procedure and employment of expensive extraction column. To circumvent the disadvantages, new extraction format and adsorbent with quickness, less consumption of organic solvent, superior extraction performance and low cost should be developed for the analysis of LCMs.
RESULTS: Using 1H,1H,2H,2H-heptadecafluorodecyl acrylate and 9-vinylanthracene as mixed functional monomers, a task specific magnetic adsorbent (TSMA) was prepared by one-pot hydrothermal technique for the highly efficient capture of LCMs under magnetic solid phase extraction (MSPE) format. Due to the abundant functional groups, the developed TSMA/MSPE presented satisfactory capture performance towards LCMs. Satisfactory enrichment factors (132-212) and high adsorption capacity (18 mg/g) were obtained. Additionally, the relevant adsorption mechanism was studied by the combination of density functional theory calculation and experiments about adsorption kinetics and adsorption isotherm. Under the beneficial conditions, a sensitive and reliable method for the monitoring of studied LCMs in environmental waters was established by the combination of TSMA/MSPE with HPLC equipped with diode array detector (DAD). The achieved limits of detection and spiked recoveries were 0.0025-0.0061 μg/L and 81.0-112 %, respectively. Finally, the developed method was employed to monitor LCMs levels in the North Creek watershed of Jiulong River.
UNASSIGNED: The current study provided a new adsorbent for quick and efficient capture of LCMs at trace levels. In addition, a sensitive, reliable and anti-intereference method for the monitoring of trace LCMs in actual waters was established. Moreover, for the first, the contents, occurrence and distribution of LCMs in North Creek watershed was investigated based on the developed method.