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Influence of humic acids on zinc oxide nanoparticles and zinc chloride toxicity to Enchytraeus crypticus studied in agar based exposure media
Authors: Hrdá Kateřina | Konopáčová Eliška | Vrzáčková Inka | Pouzar Miloslav
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Scientific Papers of the University of Pardubice, Series A, Faculty of Chemical Technology
Page from-to: 187-196
Titles:
Language Name Abstract Keywords
cze Vliv huminových kyselin na toxicitu chloridu zinečnatého a nanočástic oxidu zinečnatého pro roupice Enchytraeus crypticus kultivované v agarových živných médiích Byl studován vliv různých zdrojů huminových kyselin (humát sodný, rašelina) na výslednou toxicitu ZnCl2 a nanočástic ZnO pro roupice Enchytraeus crypticus kultivované v agarových živných médiích. V případě ZnCl2 přídavek huminových kyselin vždy snížil výslednou toxicitu. V případě ZnO nanočástic přídavek humátu sodného pozorovanou toxicitu naopak zvýšil a snížení toxicity bylo pozorováno pouze po přidavku rašeliny. toxicita; nanočástice; rašelina; humát sodný; oxid zinečnatý; Enchytraeus
eng Influence of humic acids on zinc oxide nanoparticles and zinc chloride toxicity to Enchytraeus crypticus studied in agar based exposure media Composition of the exposure media always affects the properties of nanomaterials. In terrestrial ecotoxicology, the complex nature of the soil highly complicates the prediction of impacts of pollutants upon the environment. In our study, less complex agar-based exposure medium had been therefore used instead a soil. An acute toxicity of zinc oxide nanoparticle (ZnO-NPs, mean particle size diameter of 10 nm) powder and of water-soluble salt of zinc (ZnCl2) to annelid Enchytraeus crypticus were tested, while agar-based exposure medium was modified with two sources of humic acids (sodium humate, peat) in order to study the influence of soil component and its form on toxicity of zinc. In the case of ZnCl2, an addition of humic acid always reduced the toxicity. The respective values of LC50 were 13.2, 28.8, and 191 mg kg-1 for pure agar, agar with sodium humate, and agar with peat, respectively. On the contrary, the addition of sodium humate into an agar increased toxicity of ZnO NPs and the reduction in toxicity was observed only for the addition of a peat. The corresponding LC50 values then were 43.5 (pure agar), 15.8 (agar with sodium humate), and 304 (agar with peat) mg kg-1. toxicity; nanoparticles; peat; humic acids; zinc oxide; Enchytraeus; sodium humate

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