Formation of Dioxins on Metals during Soldering Process
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概要
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The point which exceeded an environmental standard for water quality of 1pg-TEQ/<I>l</I>by the Dioxins environmental pollution survey at river in Kanagawa prefecture had been found. In our following survey, the emission of Dioxins from the soldering process in a factory was confirmed.<BR>Dioxins were generated in<I>de novo</I>synthesis while some organic compounds were pyrolyzed in coexistence of metals during soldering process. This study investigated the conditions of Dioxins formation in soldering process using an experimental tubular furnace. Soldering was usually performed in the use of a flux containing compounds, hydrocarbon and chloride ion in supply. A large amount of Dioxins was especially formed under coexist of iron or copper with aromatic hydrocarbon and inorganic chloride ion. The increase of the amount of organic compounds and hydrogen chloride, and the increase of surface area of copper advanced the formation of Dioxins. It was made clear that Dioxins were generated in the process of the coexistence of metals as the catalyst, hydrocarbon and chloride ion, and the temperature up from room temperature, like the soldering process.
- 日本環境化学会の論文
日本環境化学会 | 論文
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