Assessing strategies to measure hidden per- and polyfluoroalkyl substances (PFAS) in groundwater and to evaluate adsorption remediation efficiencies [0.03%]
评估地下水测量隐蔽的全氟和多氟烷基物质(PFAS)策略及评价吸附修复效率的方法
Osmar Menezes,Kartika Srivastava,Bianca Ferreira et al.
Osmar Menezes et al.
We analyzed total oxidizable precursors (TOP) via TOP assay followed by LC-MS/MS, and total organic fluorine (TOF) via combustion ion chromatography (CIC). Results were compared with those from LC-MS/MS analysis of 25 individual PFAS (∑PFAS25), representing the non-hidden PFAS fraction.
Combining Advanced Analytical Methodologies to Uncover Suspect PFAS and Fluorinated Pharmaceutical Contributions to Extractable Organic Fluorine in Human Serum (Tromsø Study) [0.03%]
结合先进分析方法揭示疑似PFAS和含氟药物对人类血清可提取有机氟的贡献（ Tromsø研究）
Lara Cioni,Vladimir Nikiforov,Jonathan P Benskin et al.
Lara Cioni et al.
We combined multiple analytical techniques (direct infusion Fourier transform ion cyclotron resonance mass spectrometry, liquid chromatography-Orbitrap-high-resolution mass spectrometry, and total oxidizable precursors assay) in a three-step suspect screening process which aimed at unequivocal suspect
Are Geotextiles Silent Contributors of Ultrashort Chain PFASs to the Environment? [0.03%]
纺织品是极短链PFAS环境输入的隐形来源吗？
Elissar Mikhael,Abdelmalek Bouazza,Will P Gates et al.
Elissar Mikhael et al.
"PFAS total" parameters comprising total fluorine (TF) and total oxidizable precursors (TOPs) indicate that no significant precursor mass nor untargeted intermediates were present in geotextiles.
Hunting the missing fluorine in aqueous film-forming foams containing per- and polyfluoroalkyl substances [0.03%]
含全氟和多氟烷基物质的成膜泡沫中缺失氟原子的追踪研究
Min Liu,Caitlin M Glover,Gabriel Munoz et al.
Min Liu et al.
As a result of identifying new compounds, LC-HRMS was fully able to capture the oxidizable precursors determined by TOP assay in all tested fluorotelomer (FT) AFFFs, while unknown compounds still constituted a significant fraction (19-53 mol%) in most electrochemical fluorination (ECF) AFFFs.
Fluorine Mass Balance, including Total Fluorine, Extractable Organic Fluorine, Oxidizable Precursors, and Target Per- and Polyfluoroalkyl Substances, in Pooled Human Serum from the Tromsø Population in 1986, 2007, and 2015 [0.03%]
来自 Tromsø 地区人群的混合人血清中总氟、可提取的有机氟、氧化前体以及目标全氟和多氟烷基物质在 1986 年，2007 年及 2015 年的质量守恒分析
Lara Cioni,Merle Plassmann,Jonathan P Benskin et al.
Lara Cioni et al.
Here, we address this problem by applying a comprehensive fluorine mass balance (FMB) approach, including total fluorine (TF), extractable organic fluorine (EOF), total oxidizable precursors (TOP), and selected target PFAS, to human serum samples collected over a period of 28 years (1986, 2007, and 2015
Further Insight into Extractable (Organo)fluorine Mass Balance Analysis of Tap Water from Shanghai, China [0.03%]
中国上海自来水可提取（ organo）氟质量平衡分析的进一步见解
Enmiao Jiao,Pontus Larsson,Qi Wang et al.
Enmiao Jiao et al.
In this study, tap water samples (n = 39) from Shanghai were collected to assess the levels of EF/EOF, 35 target PFAS, two inorganic fluorinated anions (tetrafluoroborate (BF4-) and hexafluorophosphate (PF6-)), and novel PFAS through suspect screening and potential oxidizable precursors through oxidative
Occurrences and fates of per- and polyfluoralkyl substances in textile dyeing wastewater along full-scale treatment processes [0.03%]
基于全尺寸处理工艺的纺织印染废水中含氟污染物的发生与归宿研究
Yuqian Jia,Chao Shan,Wanyi Fu et al.
Yuqian Jia et al.
The total oxidizable precursors (TOP) assay revealed that the total concentration of PFASs was increased by 2.3-4.1 times after oxidation, accompanied by formation of terminal perfluoroalkyl acids (PFAAs) and degradation of emerging alternatives to various extents.
Legacy perfluoroalkyl acids and their oxidizable precursors in plasma samples of Norwegian women [0.03%]
挪威妇女血浆中的全氟烷基酸及其可氧化前体物质的痕迹分析
Ana Carolina M F Coêlho,Lara Cioni,Wendy Van Dreunen et al.
Ana Carolina M F Coêlho et al.
Humans are exposed to perfluoroalkyl acids (PFAA) mainly through direct pathways, such as diet and drinking water, but indirect exposure also occurs when PFAA precursors break down to form legacy PFAA. Exposure to PFAA precursors raises par...
Transport and transformation of perfluoroalkyl acids, isomer profiles, novel alternatives and unknown precursors from factories to dinner plates in China: New insights into crop bioaccumulation prediction and risk assessment [0.03%]
中国全氟烷基酸、异构体分布、新型替代物和未知前体从工厂到餐桌的传输、转化及作物生物积累预测与风险评估的新见解
Shun Liu,Zhaoyang Liu,Wenfeng Tan et al.
Shun Liu et al.
After a total oxidizable precursors (TOP) assay, incremental perfluoroalkyl carboxylic acids (PFCAs) were massively found (325-5940 ng/g) in edible vegetable parts. Besides, precursor degradation and volatilization loss of PFASs was firstly confirmed during vegetable cooking.
Lara Cioni,Vladimir Nikiforov,Ana Carolina M F Coêlho et al.
Lara Cioni et al.
A promising tool is the total oxidizable precursors (TOP) assay to look for precursors by oxidation to perfluoroalkyl acids (PFAA). The TOP assay was originally developed for large volumes of water and had to be adapted for 250 μL of human serum....As some precursors are not fully converted to PFAA, the TOP assay can only provide semi-quantitative estimates of oxidizable precursors in human serum.
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