稀土元素镱和钕对大型溞的毒性效应研究
Toxic Effects of Rare Earth Element Ytterbium and Neodymium on Daphnia magna
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摘要: 考察典型稀土元素镱和钕对大型溞的急性和慢性毒性，结果表明，钕对大型溞的24 h半数致死浓度（LC50）为37.72 mg·L-1，95%的置信区间为30.49～58.56 mg·L-1；48 h-LC50为12.98 mg·L-1，95%的置信区间为10.56～15.84 mg·L-1。镱对大型溞的24 h和48 h的LC50分别为24.57 mg·L-1和7.91 mg·L-1，95%的置信区间分别为12.64～66.01 mg·L-1和6.73～10.39 mg·L-1。研究含钕暴露液对大型溞的21 d慢性毒性，发现大型溞的繁殖能力和正常生长能力均受到抑制，表现在蜕壳时间与产溞时间延长，产溞数量下降和内禀增长率降低。综合考虑分析得出钕元素对大型溞21 d的最低可观察效应浓度（LOEC）为0.3 mg·L-1，无可观察效应浓度（NOEC）为0.12 mg·L-1，95%的置信区间为0.08～0.14 mg·L-1。Abstract: Laboratory-scale acute and chronic toxicity tests of the model organism Daphnia magna exposed to ytterbium (Yb) and neodymium (Nd) as typical rare earth elements (REEs) were performed in order to determine the relationship between survival rate or reproduction performance and REEs concentrations. The experimental results showed that the 24 h- and 48 h-LC50 and their 95% confidence intervals (CIs) of Nd were calculated as 37.72 (30.49~58.56) mg·L-1 and 12.98 (10.56~15.84) mg·L-1, respectively. Moreover, the 24 h- and 48 h-LC50 and their 95% CIs of Yb were determined as 24.57 (12.64~66.01) mg·L-1 and 7.91 (6.73~10.39) mg·L-1, respectively. In chronic tests of Nd, the increased Nd concentrations delayed the time to first brood and reduced total reproduction of D. magna resulting in a decreased intrinsic rate of natural increase. Collectively, the lowest observed effect concentration (LOEC) of Nd after 21 d exposure is 0.3 mg·L-1 and the no observed effect concentration (NOEC) is 0.12 mg·L-1, with the corresponding 95% CI of 0.08~0.14 mg·L-1.
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Key words:
- neodymium /
- ytterbium /
- Daphnia magna /
- ecotoxicology
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