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Single-walled carbon nanotubes toxicity to the freshwater amphipod Hyalella azteca: influence of sediment and exposure duration

机译:单壁碳纳米管对淡水两栖动物透明质酸的毒性:沉淀物和暴露时间的影响

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Carbon nanomaterials are present in various industrial applications and therefore their release into the environment including freshwater ecosystem is expected to increase. The aim of the present study was to investigate the influence of several parameters on the toxicity of single-walled carbon nanotubes (SWCNT) to the freshwater amphipod, Hyalella azteca . The effect of period of exposure, sediment presence and possible impurities released during SWCNT preparation on survival and/or growth of such organism was evaluated. We measured a reduction of survival at concentrations ranging from 10 to 40 mg/L after 96-h exposure, while no mortality was observed with the same concentrations and in the presence of artificial sediment after 14 days of exposure. It is possible that SWCNT are adsorbed on the organic matter from the artificial sediment leading to a decrease of SWCNT bioavailability. The survival and growth toxicity tests revealed a stronger effect at 28 days compared to the 14 days of exposure, and full mortality of organisms at 1000 mg/L for both exposure times. The presence of SWCNT in the gut of survived organisms was observed. The present study demonstrates that the interaction with sediment should be considered when carbon nanotubes toxicity through water exposure is investigated.
机译:碳纳米材料存在于各种工业应用中,因此,它们向环境(包括淡水生态系统)的释放有望增加。本研究的目的是研究几个参数对单壁碳纳米管(SWCNT)对淡水两栖动物Hyalella azteca的毒性的影响。评估了暴露时间,沉积物的存在以及SWCNT制备过程中释放的可能杂质对此类生物的存活和/或生长的影响。我们测量了暴露96小时后浓度从10到40 mg / L的存活率降低,而暴露14天后在相同浓度和存在人工沉积物的情况下没有观察到死亡率。 SWCNT可能会从人造沉积物中吸附到有机物上,从而导致SWCNT生物利用度降低。存活和生长毒性测试显示,与暴露14天相比,暴露28天的效果更强,两次暴露时间下1000 mg / L的生物完全死亡。观察到存活的生物体肠道中存在SWCNT。本研究表明,当研究碳纳米管通过水接触的毒性时,应考虑与沉积物的相互作用。

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