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Photolysis- and Dissolved Organic Matter-Induced Toxicity of Triclocarban to Daphnia magna
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2017-10-10 00:00:00 , DOI: 10.1021/acs.estlett.7b00429
Katie A. Albanese 1 , Roman P. Lanno 2 , Christopher M. Hadad 3 , Yu-Ping Chin 4
Affiliation  

Triclocarban (TCC) is a common antimicrobial compound used in soaps and other household products and is found globally in many surface waters. This study investigated the acute toxicity of TCC and its photolyzed products to Daphnia magna using 50% 96-h lethal concentration (LC50) tests. The effects of dissolved organic matter (DOM) on the toxicity of TCC photoproducts to D. magna were also studied. Direct photolysis of TCC formed photoproducts that were significantly less toxic (LC50 value of 2.67 ± 0.6 μM) than the parent TCC compound (LC50 value of 0.087 ± 0.3 μM). In contrast, the indirect photolysis of TCC in the presence of DOM produced photoproducts that were significantly more toxic (LC50 value of 0.032 ± 0.015 μM). Chlorinated anilines and isocyanates, identified by mass spectrometry, were formed in the presence of DOM as indirect photolysis products of TCC and were shown to be partially responsible for the observed toxicity.

中文翻译:

光解和溶解的有机物诱导的三氯卡班对水蚤的毒性。

三氯卡班(TCC)是一种常见的抗菌化合物,用于肥皂和其他家用产品,并且在全球许多地表水中都发现了这种化合物。这项研究使用50%96-h致死浓度(LC 50)试验研究了TCC及其光解产物对大型蚤(Daphnia magna)的急性毒性。还研究了可溶性有机物(DOM)对TCC光产物对D. magna的毒性的影响。TCC的直接光解形成的光产品的毒性(LC 50值为2.67±0.6μM)明显低于母体TCC化合物(LC 50值为0.087±0.3μM)。相反,在存在DOM的情况下TCC的间接光解产生的光产物毒性更大(LC 50值为0.032±0.015μM)。通过质谱法鉴定的氯化苯胺和异氰酸酯是在DOM存在下作为TCC的间接光解产物而形成的,并被证明部分负责所观察到的毒性。
更新日期:2017-10-10
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