Chronic toxicity of silver nitrate to Ceriodaphnia dubia and Daphnia magna, and potential mitigating factors
Chronic toxicity of silver nitrate to Ceriodaphnia dubia and Daphnia magna, and potential mitigating factors
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DOI：
10.1016/j.aquatox.2007.03.022
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发表时间：
2007-08-15
影响因子：
4.5
通讯作者：
Kramer, James R.
中科院分区：
文献类型：
--
作者：
Naddy, Rami B.;Gorsuch, Joseph W.;Kramer, James R.
我们使用两种淡水枝角类生物--杜氏沼虾和大型水蚤，研究了银作为硝酸银的慢性毒性，为制定银的慢性环境水质标准提供了数据。对杜氏梭子蟹的初步研究表明，结果是不同的，这与食物和银之间的平衡时间有关。后续测试使用3h的平衡时间，以稳定溶解的Ag浓度和Ag+的毒性。结果单独(1个/杯，n=10)和批量(30个/室，n=2)，在使用相似的标准化平衡时间的情况下，得到了相似的结果。银对杜氏梭子蟹和大型梭子蟹的最大可接受毒性浓度分别为9.61mU/g和3.00mg·g/L。此外，还研究了银离子在以下两种环境中对杜氏沼虾的慢性毒性作用：(1)溶解有机碳(DOC)和(2)硫化物。当添加DOC0.4 mg/L时，毒性降低约50%，而添加硫化物(75.4 nM)时，毒性降低42%。然而，我们观察到全身钠水平的非统计下降，这是钠稳态的估计值。(C)2007 Elsevier B.V.保留所有权利。
We investigated the chronic toxicity of Ag, as silver nitrate, using two freshwater aquatic cladoceran species, Ceriodaphnia dubia and Daphnia magna, to generate data for the development of a chronic ambient water quality criterion for Ag. Preliminary studies with C. dubia showed variable results which were related to the equilibration time between food and silver. Follow-up testing was conducted using a 3 h equilibration time, which stabilized dissolved Ag concentrations and the toxicity of Ag+. Results with C. dubia conducted individually (1 per cup, n = 10) and in mass (30 per chamber, n = 2) gave similar results once similar standardized equilibration times were used. The maximum acceptable toxicant concentration (MATC) of Ag to C. dubia and D. magna was 9.61 and 3.00 mu g dissolved Ag/L, respectively. The chronic toxicity of Ag+ to C. dubia was also evaluated in the presence of: (1) dissolved organic carbon (DOC) and (2) sulfide. The addition of DOC (0.4 mg/L) resulted in a similar to 50% decrease in toxicity while the addition of sulfide (75.4 nM) deceased toxicity by 42%. Whole-body Ag concentration in D. magna was positively correlated with increased levels of Ag exposure, however; we observed a non-statistical decrease in whole-body Na levels, an estimator of sodium homeostasis. (c) 2007 Elsevier B.V. All rights reserved.