Journal
CHEMOSPHERE
Volume 129, Issue -, Pages 46-53Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2014.11.036
Keywords
PFAA; Fluoropolymers; Release; Sources; Mechanism
Categories
Funding
- EU project PERFOOD [KBBE-227525]
- European Union
- SolisTV, Germany
Ask authors/readers for more resources
Polytetrafluoroethylene (PTFE) has been widely discussed as a source of perfluorooctanoic acid (PFOA), which has been used in the production of fluoropolymers. PTFE may also contain unintended perfluoroalkyl carboxylic acids (PFCAs) caused by thermolysis of PTFE, which has been observed at temperatures above 300 degrees C. Common PTFE coated food contact materials and consumer goods are operated at temperatures above 200 degrees C. However, knowledge on possible emissions of PFCAs is limited. Therefore, it was the aim of this study to investigate and evaluate the emission of PFCAs from PTFE coated products with both, normal use and overheating scenarios. Four pans, claimed to be PFOA free, and nine consumer products were investigated. At normal use conditions (<230 degrees C), emissions from PTFE surfaces were trapped for 1 h. Overheating scenarios (>260 degrees C) recorded emissions during a 30 min heating of empty pans on a stove. Emissions were analyzed by LC-ESI-MS. Results indicate the emission of PFCAs, whereas no perfluorinated sulfonic acids were traced. At normal use conditions total emissions of PFCAs accounted for 4.75 ng per hour. Overheated pans, however, released far higher amounts with up to 12190 ng PFCAs per hour at 370 degrees C. Dominating contributors where PFBA and PFOA at normal use and PFBA and PFPeA during overheating. Temperature seems to be the main factor controlling the emission of PFCAs. A worst case estimation of human exposure revealed that emissions of PFCAs from heated PTFE surfaces would be far below the TDI of 1500 ng PFOA per kg body weight. (C) 2014 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available