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ID 52905
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Author
Arias-Barreiro, Carlos R.
Koutsaftis, Apostolos
Ogo, Atsushi
Kawano, Tomonori
Yoshizuka, Kazuharu
Inayat-Hussain, Salmaan H.
Aoyama, Isao
Abstract
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.
Keywords
Tetramethylammonium hydroxide
Potassium iodide
Aquatic toxicity
Synergism
D. magna
Semiconductor wastewater
Published Date
2015-02
Publication Title
Chemosphere
Volume
volume120
Publisher
Elsevier Ltd.
Start Page
299
End Page
304
ISSN
0045-6535
NCID
AA00603442
Content Type
Journal Article
language
英語
Copyright Holders
© 2014 Elsevier Ltd. All rights reserved.
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author
Refereed
True
DOI