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ID 52905
フルテキストURL
著者
Mori, Izumi C. Institute of Plant Science and Resources, Okayama University
Arias-Barreiro, Carlos R. Institute of Plant Science and Resources, Okayama University
Koutsaftis, Apostolos Institute of Plant Science and Resources, Okayama University
Ogo, Atsushi Institute of Plant Science and Resources, Okayama University
Kawano, Tomonori School of International Environmental Science, The University of Kitakyushu
Yoshizuka, Kazuharu School of International Environmental Science, The University of Kitakyushu
Inayat-Hussain, Salmaan H. Faculty of Health Sciences, Univerisiti Kebangsaan Malaysia
Aoyama, Isao Institute of Plant Science and Resources, Okayama University
抄録
The aquatic ecotoxicity of chemicals involved in the manufacturing process of thin film transistor liquid crystal displays was assessed with a battery of four selected acute toxicity bioassays. We focused on tetramethylammonium hydroxide (TMAH, CAS No. 75-59-2), a widely utilized etchant. The toxicity of TMAH was low when tested in the 72 h-algal growth inhibition test (Pseudokirchneriellia subcapitata, EC50 = 360 mg L−1) and the Microtox® test (Vibrio fischeri, IC50 = 6.4 g L−1). In contrast, the 24 h-microcrustacean immobilization and the 96 h-fish mortality tests showed relatively higher toxicity (Daphnia magna, EC50 = 32 mg L−1 and Oryzias latipes, LC50 = 154 mg L−1). Isobologram and mixture toxicity index analyses revealed apparent synergism of the mixture of TMAH and potassium iodide when examined with the D. magna immobilization test. The synergistic action was unique to iodide over other halide salts i.e. fluoride, chloride and bromide. Quaternary ammonium ions with longer alkyl chains such as tetraethylammonium and tetrabutylammonium were more toxic than TMAH in the D. magna immobilization test.
キーワード
Tetramethylammonium hydroxide
Potassium iodide
Aquatic toxicity
Synergism
D. magna
Semiconductor wastewater
発行日
2015-02
出版物タイトル
Chemosphere
120巻
出版者
Elsevier Ltd.
開始ページ
299
終了ページ
304
ISSN
0045-6535
NCID
AA00603442
資料タイプ
学術雑誌論文
言語
English
著作権者
© 2014 Elsevier Ltd. All rights reserved.
論文のバージョン
author
査読
有り
DOI