Large Decrease in Acute Aquatic Toxicity of Linear Alkylbenzene Sulfonate in Hard Water and Seawater by Adding Adsorbent
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- Oya Masaru
- Department of Environmental Sciences, Faculty of Education and Human Sciences, Yokohama National University
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- Takemoto Yuka
- Graduate School of Environment and Information Sciences, Yokohama National University
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- Ishikawa Yusuke
- Graduate School of Environment and Information Sciences, Yokohama National University
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説明
LAS (Linear Alkylbenzene Sulphonate) shows relatively high aquatic toxicity in hard freshwater or seawater. In this paper, we studied the effect of adsorbent on the aquatic toxicity of LAS in hard freshwater and seawater. Daphnia magna and Artemia salina were used for acute aquatic toxicity test in freshwater and seawater, respectively. Kaolin was used as a model adsorbent and toxic surface tension (γtox) was used as an indicator of toxic condition. Results showed that the values of γtox of LAS to D. magna and A. salina were about 45-55 mN/m and 35-40 mN/m, respectively. Surface tension of LAS solution decreased and its aquatic toxicity increased with increasing the water hardness or the salinity. By adding adsorbent into the solutions, the surface activity and the aquatic toxicity were decreased greatly, and the effect of water hardness or salinity on surface tension and aquatic toxicity were removed. That is to say, the surface tension curve of soft freshwater corresponds with that of hard freshwater containing adsorbent and the surface tension curve at low salinity corresponds with that obtained for high salinity solutions containing the adsorbent. Therefore, our experimental data leads to the conclusion that the relatively high aquatic toxicity of LAS in concentrated solution of inorganic salts disappears in the presence of adsorbents. This is an important viewpoint in conducting environmental risk assessment of surfactants.<br>
収録刊行物
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- Journal of Oleo Science
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Journal of Oleo Science 57 (1), 15-21, 2008
公益社団法人 日本油化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679069721472
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- NII論文ID
- 130000055444
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- NII書誌ID
- AA11503337
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- ISSN
- 13473352
- 13458957
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- NDL書誌ID
- 9304344
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可