Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, SK, Canada.
Environ Sci Technol. 2012 Jan 3;46(1):486-93. doi: 10.1021/es202415g. Epub 2011 Nov 30.
Water soluble organic compounds (OCs), including naphthenic acids (NAs), are potentially toxic constituents of oil sands process-affected water (OSPW) that is generated during extraction of bitumen from Alberta oil sands. Ozonation can decrease concentrations of OCs in OSPW. However, effects of ozonated-OSPW on multicellular organisms are unknown. A 10-day and a chronic exposure of Chironomus dilutus to OSPW were conducted to assess effects on survival, growth, development, and behavior. Two separate batches of OSPW were treated with 30 or 80 mg ozone (O(3))/L. Wet body masses of larvae exposed to OSPW were 64 to 77% less than their respective controls (p < 0.001). However, both levels of ozonation significantly attenuated effects of OSPW on growth. Similarly, chronic exposure to untreated OSPW resulted in significantly less pupation than in the controls, with 31% and 71% less pupation of larvae exposed to the two batches of OSPW (p < 0.05). Emergence was significantly less for larvae exposed to OSPW, with 13% and 8% of larvae emerging, compared to 81% in controls (p < 0.0001). Both levels of ozonation of OSPW attenuated effects on emergence. These results suggest that OCs degraded by ozonation causes toxicity of OSPW toward C. dilutus, and that ozonation attenuates toxicity of OSPW.
水溶性有机化合物（OCs），包括环烷酸（NAs），是在艾伯塔省油砂中提取沥青时产生的油砂加工影响水（OSPW）中潜在的有毒成分。臭氧氧化可以降低 OSPW 中 OCs 的浓度。然而，臭氧氧化的 OSPW 对多细胞生物的影响尚不清楚。对摇蚊进行了为期 10 天和慢性暴露于 OSPW 的实验，以评估对生存、生长、发育和行为的影响。用 30 或 80 mg 臭氧（O3）/L 处理了两批单独的 OSPW。暴露于 OSPW 的幼虫的湿体重比其相应的对照减少了 64%至 77%（p < 0.001）。然而，两种臭氧氧化水平都显著减轻了 OSPW 对生长的影响。同样，未经处理的 OSPW 的慢性暴露导致化蛹明显减少，与对照相比，暴露于两批 OSPW 的幼虫的化蛹分别减少了 31%和 71%（p < 0.05）。与对照相比，暴露于 OSPW 的幼虫的羽化明显减少，有 13%和 8%的幼虫羽化，而对照的羽化率为 81%（p < 0.0001）。两种臭氧氧化水平都减轻了 OSPW 对羽化的影响。这些结果表明，臭氧氧化降解的 OCs 导致 OSPW 对摇蚊的毒性，而臭氧氧化减轻了 OSPW 的毒性。
