Nanoparticles' fate is amongst other parameters determined by the quantity and quality of natural organic matter (NOM). Consequently, the ecotoxicity of nanoparticles is modified, while only little information is available on the NOM characteristics triggering this interplay. This study systematically examined how NOM quantity and quality influences the acute ecotoxicity of titanium dioxide nanoparticles (nTiO2) towards Daphnia magna. Therefore, two nTiO2 products (A-100 and P25; ∼100 nm) were investigated in combination with seven NOM types of variable quality at four levels each (up to 4.00 mg total organic carbon/L). The results showed that - independent of the applied nTiO2 product and NOM type - nTiO2 ecotoxicity decreased up to a factor of >18 with increasing NOM concentration. More importantly, increasing levels of aromaticity and hydrophobicity of the NOM decreased the magnitude of toxic effects caused by nTiO2, which was again independent of the nTiO2 product tested. In the light of the ubiquitary presence of NOM, the ecotoxicological risk of nTiO2 in surface waters with high NOM loads is likely moderate. However, interactions of nTiO2 and NOM in combination with other natural or chemical stressors are not well-understood but seem to be fundamental for a reliable risk assessment of nanoparticles.

译文

:纳米颗粒的命运是由天然有机物(NOM)的数量和质量决定的其他参数。因此,纳米颗粒的生态毒性得到了改善,而关于触发这种相互作用的NOM特性的信息很少。这项研究系统地检查了NOM的数量和质量如何影响二氧化钛纳米颗粒(nTiO2)对水蚤的急性生态毒性。因此,研究了两种nTiO2产物(A-100和P25;约100μm),并结合了质量各不相同的7种NOM类型,每种水平为四个水平(总有机碳含量最高为4.00μmg/ L)。结果表明-随所施用的nTiO2产品和NOM类型的不同-随着NOM浓度的增加,nTiO2的生态毒性降低至> 18。更重要的是,NOM芳香性和疏水性水平的提高降低了由nTiO2引起的毒性作用的程度,这又与所测试的nTiO2产品无关。鉴于普遍存在NOM,在高NOM负荷的地表水中nTiO2的生态毒理学风险可能适中。但是,nTiO2和NOM与其他自然或化学应激源的相互作用尚不为人所理解,但对于纳米颗粒的可靠风险评估而言,这似乎是基础。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录