The occurrence and distribution of perfluoroalkyl substances in indoor dust in Taiwan

  • 徐 靖雅

Student thesis: Doctoral Thesis

Abstract

Perfluoroalkyl substances (PFAS) are often used as surfactants due to the unique physical and chemical characteristics of the fluorocarbon bonds in the structure They are also widely used in surface treatment for commercial purposes Therefore PFAS may exist in indoor dust and pose risk to the human body In this study in order to understand the concentration and distribution of various PFAS in indoor dust in Taiwan six PFAS belonging to perfluoralkyl acids (PFAAs) (perfluorobutyric acid (PFBA) perfluorohexanoic acid (PFHxA) perfluorohexane sulfonate (PFHxS) perfluorooctanoic acid (PFOA) perfluoro-octane sulfonate (PFOS) and perfluorononanoic acid (PFNA)) were selected as the target compounds for investigation The dust from the high space low space and floor of different types of rooms was collected to explore the effect of space height and type space on the concentration of PFAAs in the dust Assess the adult risk of PFAAs concentration in dust and explore the factors that affect the cumulative concentration The results showed that the average concentration of total PFAAs in the dust of high space (n=20) low space (n=10) and floor (n=21) were 380 9±337 3 367 9±130 5 and 171 1±111 8 μg/kg dust dw respectively Among six PFAAs investigated PFOS was the main species with the highest concentration (251 6±190 5 286 6±133 5 and 53 7±57 0 μg/kg dust dw) and detection frequency The PFAAs concentrations was similar in high space and low space which could be used to indicate the suspended PFAAs pollution situation and adult exposure The concentration was highest in the laboratory and lowest in the classroom Only ingesting PFAAs through indoor dust was not harmful to adults The moisture content beryllium barium chromium manganese and zinc of high space dust the moisture content of low space dust and the nickel of ground dust were highly positively correlated with the PFAAs accumulated in the dust (r>0 7)
Date of Award2021
Original languageEnglish
SupervisorWan-Ru Chen (Supervisor)

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