John Wiley & Sons, Ltd.

Mitigation of Cu(II) phytotoxicity to rice (Oryza sativa) in the presence of TiO2 and CeO2 nanoparticles combined with humic acid

0
Engineered nanoparticles (NPs) and natural organic matter (NOM) in the environment may interact with background contaminants such as heavy metals and modify their bioavailability and toxicity. In this work, the combined influences of two common NPs (TiO2 and CeO2) and humic acid (HA, as a model NOM) on Cu(II) phytotoxicity to rice were investigated by a 3‐day root elongation assay performed on filter paper media. The results showed that the adsorption coefficient of bare TiO2 and CeO2 NPs (100 mg/L) toward Cu2+ is 2.65 and 4.37 respectively at an initial concentration of 10 mg/L, suggesting that Cu(II) could be strongly adsorbed by NPs, while HA coated‐TiO2 and CeO2 NPs further enhanced the adsorption coefficient to 4.37 and 6.85, respectively. Meanwhile, compared with Cu alone treatment, the addition of bare TiO2, CeO2 NPs (1000 mg/L) increased the length of rice root by 32.5% and 39.0%, respectively; however, the presence of HA‐coated TiO2 and CeO2NPs increased the root length by 90.2% and 100.1%, respectively, which indicated that the mitigation effect of HA‐coated NPs on Cu(II) phytotoxicity was more visible than that of bare NPs. Our results demonstrated that co‐existence of NPs and HA significantly alleviated Cu(II) phytotoxicity due to decrease of bioavailable soluble Cu(II) concentration, which is helpful to better understand the potential behavior of NPs in the environment. This article is protected by copyright. All rights reserved

Customer comments

No comments were found for Mitigation of Cu(II) phytotoxicity to rice (Oryza sativa) in the presence of TiO2 and CeO2 nanoparticles combined with humic acid. Be the first to comment!