Study on the Air Environmental Impact of the Aqueous Film-Formimg Foam
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概要
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The aqueous film-forming foams (AFFFs) are used for massive conflagration such as industrial fire and petroleum fire because of their efficient fire control. In this study, in order to analyze the combustion products of them, the flow type reactor was designed and combustion experiment carried out. Chemicals were extracted from generated powder dust to distillated water by ultrasound and analyzed by using LC-MS. And combustion product gases were trapped by tedler-bag and analyzed by using GC-MS. Perfluorooctane sulfonate and perfluorooctane acid were detected form powder dust, and other polycyclic aromatics were also detected. Hydrogen fluoride and sulfur dioxide were detected from combustion product gas. In case of combustion of the fluorochemical surfactants, perfluorooctane sulfonate, perfluorooctane acid, hydrogen fluoride and sulfur dioxide were also detected. Therefore, there is the possibility of generating perfluorooctane sulfonate (C<SUB>8</SUB>HF<SUB>17</SUB>SO<SUB>3</SUB>) and perfluorooctane acid (C<SUB>8</SUB>HF<SUB>15</SUB>O<SUB>2</SUB>) from fluorochemical surfactants in the AFFFs. Perfluorooctane sulfonate and perfluorooctane acid have been used all over the world, mainly as water repellent agents, fluorochemical surfactants, coating agents etc. However they are environmental contaminants because of their stability, bio-accumulativeness, and long-term persistence in the ecological environment. At the present day, they are diffused all over the world (PFOS problem). Fluorochemical surfactants are key compounds in the aqueousfilm-forming foam (AFFF) formulations. The combustion of AFFFs may become cause of PFOS problem.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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