当前位置: X-MOL 学术Arch. Environ. Contam. Toxicol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Survival and Reproductive Effects in the Aquatic Invertebrate Ceriodaphnia dubia Exposed to Uranium Spiked Site Water Collected from Two Creeks in the Yukon, Canada.
Archives of Environmental Contamination and Toxicology ( IF 3.7 ) Pub Date : 2020-05-09 , DOI: 10.1007/s00244-020-00740-z
Jorgelina Muscatello 1 , David Flather 1 , Jennie Gjertsen 2
Affiliation  

This study evaluates aqueous uranium (U) toxicity in Ceriodaphnia dubia exposed to surface water collected from two creeks located in U-rich areas of Yukon, Canada. Water for toxicity testing was collected at two times of the year to represent water quality characteristics generally observed during open-water (high flows) and winter baseflow water (low flows) seasons. Collected water was transferred to the toxicological laboratory and spiked with U to achieve nominal concentrations of 50, 150, 350, 500, 650, 800, and 1000 µg U/L. Toxicity endpoints included lethal concentrations (LC50) for survival, in addition to no observed effect concentration (NOEC) and lowest observed effect concentration (LOEC) for reproduction. All derived toxicity endpoints were significantly higher than applicable Canadian water-quality guidelines for U (15 μg/L [Chronic] and 33 μg/L [Acute]). No effects on C. dubia survival were observed at LC50 concentrations > 799 μg U/L. Derived NOEC (381 μg U/L) and LOEC (524 μg U/L) values also were significantly above chronic water quality guidelines. The differences noted in the toxicity response between seasons were mainly due to the presence of toxicity ameliorating factors for U (i.e., dissolved organic carbon). These results highlight the high conservatism in applicable water-quality guidelines and the crucial need to consider site-specific water characteristics when deriving environmentally relevant, yet protective thresholds for uranium in aquatic environments.

中文翻译:

暴露于加拿大育空地区两条小溪中收集的铀尖峰水的水生无脊椎动物杜鹃鱼的生存和生殖作用。

这项研究评估了暴露于来自加拿大育空地区富含铀的两条小溪中收集的地表水的杜鹃中氧化铀的毒性。一年两次收集用于毒性测试的水,以表示通常在露天水(高流量)和冬季基流水(低流量)季节观察到的水质特征。收集的水被转移到毒理学实验室,并加有U,达到标称浓度50、150、350、500、650、800和1000 µg U / L。毒性终点包括存活的致死浓度(LC50),此外没有生殖效应的观察到的浓度(NOEC)和最低生殖作用的观察到的浓度(LOEC)。所有得出的毒性终点均显着高于适用的加拿大水质准则(U值为15μg/ L [慢性]和33μg/ L [急性])。当LC50浓度> 799μgU / L时,未观察到对C. dubia存活的影响。衍生的NOEC(381μgU / L)和LOEC(524μgU / L)值也大大高于慢性水质准则。不同季节之间在毒性反应中注意到的差异主要是由于存在针对U(即溶解的有机碳)的毒性改善因子。这些结果突显了适用的水质准则中的高度保守性,以及在得出与水有关的环境相关的铀保护阈值时,必须考虑特定地点的水质的关键需求。LC50浓度> 799μgU / L时,观察到杜比亚存活。衍生的NOEC(381μgU / L)和LOEC(524μgU / L)值也大大高于慢性水质准则。不同季节之间在毒性反应中注意到的差异主要是由于存在针对U(即溶解的有机碳)的毒性改善因子。这些结果突显了适用的水质准则中的高度保守性,以及在得出与水有关的环境相关的铀保护阈值时,必须考虑特定地点的水质的关键需求。LC50浓度> 799μgU / L时,观察到杜比亚存活。衍生的NOEC(381μgU / L)和LOEC(524μgU / L)值也大大高于慢性水质准则。不同季节之间在毒性反应中注意到的差异主要是由于存在针对U(即溶解的有机碳)的毒性改善因子。这些结果突显了适用的水质准则中的高度保守性,以及在得出与水有关的环境相关的铀保护阈值时,必须考虑特定地点的水质的关键需求。不同季节之间在毒性反应中注意到的差异主要是由于存在针对U(即溶解的有机碳)的毒性改善因子。这些结果突显了适用的水质准则中的高度保守性,以及在得出与水有关的环境相关的铀保护阈值时,必须考虑特定地点的水质的关键需求。不同季节之间在毒性反应中注意到的差异主要是由于存在针对U(即溶解的有机碳)的毒性改善因子。这些结果突显了适用的水质准则中的高度保守性,以及在得出与水有关的环境相关的铀保护阈值时,必须考虑特定地点的水质的关键需求。
更新日期:2020-05-09
down
wechat
bug