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首页> 外文期刊>Environmental toxicology and chemistry >Relating daily solar ultraviolet radiation dose in salt marsh-associated estuarine systems to laboratory assessments of photoactivated polycyclic aromatic hydrocarbon toxicity.
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Relating daily solar ultraviolet radiation dose in salt marsh-associated estuarine systems to laboratory assessments of photoactivated polycyclic aromatic hydrocarbon toxicity.

机译：将盐沼相关河口系统中的日太阳紫外线辐射剂量与光活化多环芳烃毒性的实验室评估联系起来。

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摘要

Estuaries of the southeastern United States not only serve an important nursery function but also are common repositories of polycyclic aromatic hydrocarbons (PAHs) derived from upland activities. Thus, these habitats may be at risk for PAH phototoxicity. To better characterize this risk, a daily survey of ultraviolet-A (UV-A; 320-400 nm) irradiance was performed at Leadenwah Creek (Wadmalaw Island, SC, USA) on June 27 and August 1, 2003. In addition, laboratory assays were completed using two light exposure regimes: One that was typical of historical phototoxicity assessments (continuous light [C-UV]), and a more environmentally realistic regime (ER-UV). On both survey days, irradiance at a depth of 10 cm exhibited a pattern generally similar to that observed at the surface, whereas irradiance at the bottom of the creek was a function of both tidal height and time of day. Total UV-A dose at a 10-cm depth on June 27 and August 1, 2003 was 4.37 and 4.78 J/cm2, respectively. Attenuation coefficients on both days varied as a function of tidal height. In the laboratory, larval grass shrimp (Palaemonetes pugio) exposed to an ER-UV regime for these habitats (photoperiod, 12:12-h light:dark; total daily UV-A dose, 4.40 J/cm2) exhibited a 2.5-fold decrease in toxicity compared with those exposed to the C-UV regime (photoperiod, 24:0-h light:dark; total daily UV dose, 1.50 J/cm2), despite a threefold higher UV dose in the ER-UV regime. The lower potency under the ER-UV regime likely is attributable to the presence of a 12-h dark period allowing for recovery. The consequences of these results are discussed in the context of habitat-specific UV-A dose and its relevance to future laboratory assessments of PAH phototoxicity.
机译：美国东南部的河口不仅起着重要的育苗功能，而且还是源自陆地活动的多环芳香烃（PAH）的常见储存库。因此，这些栖息地可能有PAH光毒性的风险。为了更好地描述这种风险，于2003年6月27日至8月1日在Leadenwah Creek（美国南卡罗来纳州瓦德马劳岛）进行了紫外线A（UV-A; 320-400 nm）辐照度的每日调查。此外，实验室使用两种曝光方案可以完成测定：一种是历史光毒性评估的典型特征（连续光[C-UV]），另一种是在环境上更现实的方案（ER-UV）。在两个调查日中，深度为10 cm的辐照都呈现出与表面观察到的大致相似的图案，而在小河底部的辐照则是潮高和一天中时间的函数。 2003年6月27日和8月1日在10厘米深处的总UV-A剂量分别为4.37和4.78 J / cm2。这两天的衰减系数随潮高变化。在实验室中，针对这些栖息地（光周期，12：12-h光照：黑暗；日总UV-A剂量为4.40 J / cm2）暴露于这些栖息地的ER-UV处理的幼虫草虾（Palaemonetes pugio）表现出2.5倍的光强与ER-UV方案相比，尽管暴露于C-UV方案（光周期，24：0-h光照：黑暗；每日总UV剂量，1.50 J / cm2），但毒性降低。 ER-UV方案下较低的效力可能归因于存在12小时的黑暗期，可以恢复。这些结果的后果将在特定于栖息地的UV-A剂量及其与未来实验室对PAH光毒性的评估中的相关性中进行讨论。

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