Publications by authors named "L U Yeung"

Introduction: Population risk for neural tube defects (NTDs) can be determined using red blood cell (RBC) folate. However, a paucity of biomarker and surveillance data among non-lactating, non-pregnant women of reproductive age (NPWRA) from Africa limits accurate assessment. Our study assessed folate and vitamin B12 status among non-lactating NPWRA and predicted population risk of NTDs in Tanzania.

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Per- and polyfluoroalkyl substances (PFAS)-containing firefighting foam have been used in stationary fire suppression systems for several decades. However, there is a lack of research on how to decontaminate PFAS-contaminated infrastructure and evaluate treatment efficiency. This study assessed the removal of PFAS from stainless steel pipe surfaces using different cleaning agents (tap water, methanol, and aqueous solutions containing 10 and 20 wt % of butyl carbitol (BC)) at different temperatures (20 °C, 40 °C, and 70 °C).

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Despite advancements in high-resolution screening techniques, the identification of novel perfluoroalkyl and polyfluoroalkyl substances (PFAS) remains challenging without prior structural information. In view of this, we proposed and implemented a new data-driven algorithm to calculate spectral similarity among PFAS, facilitating the generation of molecular networks to screen for unknown compounds. Using this approach, 81 PFAS across 12 distinct classes were identified in soil samples collected near an industrial park in Shandong Province, China, including the first reported occurrence of 12 iodine-substituted PFAS.

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Article Synopsis
  • * Researchers detected 36 types of PFAS in the surface snow of the Arctic island of Spitsbergen during 2019, indicating widespread contamination, especially from local sources with some levels up to 54 times higher in populated areas.
  • * The study found that seasonal changes in sunlight significantly affect the formation and deposition of certain PFAS, suggesting that photochemical processes are key in the Arctic atmosphere's pollution dynamics.
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Article Synopsis
  • PFASs are a group of man-made chemicals, and ultrashort-chain PFAAs have become a focus due to their environmental impact and prevalence.
  • A literature database from 1990 to 2024 reveals that these ultrashort-chain PFAAs, particularly TFA, are widely found in various environments and often at higher concentrations than longer-chain PFASs.
  • The review also indicates that ultrashort-chain PFAAs are present in many living organisms, including humans, and emphasizes the need for research and regulation due to their increasing significance in environmental health discussions.
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