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A serial PFASs sorption technique coupled with adapted high volume direct aqueous injection LCMS method

机译:串联PFASs吸附技术与适应的大体积直接水相注入LCMS方法结合

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摘要

Per- and polyfluoroalkyl substances (PFAS) are ubiquitous global environmental contaminants, environmentally persistent, mobile, can bioaccumulate and are toxic. Increasing emphasis is placed on the immobilisation and removal of PFAS from contaminated environmental matrices such as: potable water, surface water, groundwater, wastewater, sediments and soils (Dauchy et al., 2017; Cao et al., 2019; Hepburn et al., 2019). To achieve this, development of PFAS sorbents is increasingly undertaken (Du et al., 2014). Sorption studies are used to observe the interaction of sorbent and sorbate, but have two key limitations when undertaking sorption experiments for PFAS (1) the experimental protocol and (2) analytical techniques. The current batch sorption methods approached recommended by OECD Guideline 106 (OECD, 2000) are problematic, firstly, due to large sample numbers and PFAS specific laboratory difficulties, including near ubiquitous background PFAS contamination. Secondly, PFAS analytical techniques currently require solid-phase extraction (SPE) to be employed, which is slow and expensive, prior to instrumental analysis with liquid chromatography-mass spectrometry (LC-MS). A suitable alternative approach is needed to mitigate the drawbacks of current methodologies whilst catering for the high sample throughput required by benchtop trials characterising the sorption behaviour of PFAS - sorbent pairings.
机译:全氟烷基物质和多氟烷基物质(PFAS)是普遍存在的全球环境污染物,在环境上持久,易移动,可生物蓄积并有毒。越来越重视从污染的环境基质中固定和去除PFAS,例如:饮用水,地表水,地下水,废水,沉积物和土壤(Dauchy等人,2017; Cao等人,2019; Hepburn等人。 ,2019)。为实现这一目标,越来越多地开发PFAS吸附剂(Du等,2014)。吸附研究用于观察吸附剂和被吸附物的相互作用,但是在进行PFAS吸附实验时有两个主要局限性(1)实验方案和(2)分析技术。经合组织准则106(经合组织,2000年)建议采用的当前分批吸附方法存在问题,首先是由于样品数量大和PFAS特定的实验室困难,包括普遍存在的背景PFAS污染。其次,PFAS分析技术目前要求采用液相萃取-质谱(LC-MS)进行仪器分析之前,固相萃取(SPE)既缓慢又昂贵。需要一种合适的替代方法来减轻当前方法的弊端,同时满足表征PFAS-吸附剂对吸附行为的台式试验所需的高样品通量。

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