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首页> 外文期刊>Environmental toxicology and chemistry >PHOTOTOXICITY OF OIL SANDS-DERIVED POLYCYCLIC AROMATIC COMPOUNDS TO JAPANESE MEDAKA (ORYZIAS LATIPES) EMBRYOS
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PHOTOTOXICITY OF OIL SANDS-DERIVED POLYCYCLIC AROMATIC COMPOUNDS TO JAPANESE MEDAKA (ORYZIAS LATIPES) EMBRYOS

机译：油砂衍生的多环芳族化合物对日本产中草药（水稻）的光致毒性

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摘要

Alkylated polycyclic aromatic compounds (PACs), which are rich in dibenzothiophenes, are present in natural and reclaimed aquatic environments in the oil sands region of northern Alberta (Canada). An oil sands—derived PAC extract has been shown to induce signs of blue sac disease in Japanese medaka (Oryzias latipes) embryos. Information regarding exposure to and effects of oil sands PACs is available, but little of this information concerns the impact of modifying factors. The present study focuses on the effect of simulated solar radiation on oil sands-derived PAC toxicity to Japanese medaka embryos. Photomodification of the oil sands PAC extract caused reduced toxicity with an increase in the duration of ultraviolet (UV) exposure. Generally, mortality and developmental endpoints and, to a lesser extent, growth were affected by photomodification. Coexposures of the PAC mixture and UV caused slight increases in toxicity for mortality and embryonic developmental endpoints at the longest duration of UV exposure tested (16 h). Based on the modest phototoxicity of the oil sands PAC extract to Japanese medaka embryos, enhanced toxicity associated with UV irradiation may not be a concern for embryos of fish species that are common to the oil sands region. However, testing the effects of differing levels of UV irradiation on larval fish and invertebrates that may differ in their PAC bioaccumulation would improve our understanding concerning the importance of UV irradiation as a modifying factor in oil sands environmental risk assessment.
机译：富含二苯并噻吩的烷基化多环芳族化合物（PAC）存在于加拿大艾伯塔省北部油砂地区的自然和再生水生环境中。研究表明，油砂衍生的PAC提取物可在日本（Oryzias latipes）胚胎中诱发蓝囊病迹象。可获得有关油砂PAC暴露和影响的信息，但是这些信息很少涉及修改因素的影响。本研究的重点是模拟太阳辐射对油砂衍生的PAC对日本medaka胚胎的毒性作用。油砂PAC提取物的光改性导致毒性降低，并且紫外线（UV）暴露时间延长。通常，死亡率和发育终点以及较小程度的生长受光改性的影响。在最长的紫外线照射时间（16小时）下，PAC混合物和紫外线的共同暴露导致死亡率和胚胎发育终点的毒性略有增加。基于油砂PAC提取物对日本高胚胎的适度光毒性，对于油砂地区常见的鱼类而言，与紫外线辐射相关的增强毒性可能不是问题。但是，测试不同水平的紫外线照射对幼虫鱼和无脊椎动物的PAC生物蓄积可能不同的影响，将使我们对紫外线照射作为油砂环境风险评估中修饰因子的重要性的认识有所提高。

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