Toxicity evaluation of ZnO and TiO2 nanomaterials in hydroponic red bean (Vigna angularis) plant: Physiology, biochemistry and kinetic transport

Jahan, Shanaz and Alias, Yatimah and Bakar, Ahmad Farid Abu and Yusoff, Ismail (2018) Toxicity evaluation of ZnO and TiO2 nanomaterials in hydroponic red bean (Vigna angularis) plant: Physiology, biochemistry and kinetic transport. Journal of Environmental Sciences, 72. pp. 140-152. ISSN 1001-0742

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Official URL: https://doi.org/10.1016/j.jes.2017.12.022

Abstract

The toxicity and kinetic uptake potential of zinc oxide (ZnO) and titanium dioxide (TiO2) nanomaterials into the red bean (Vigna angularis) plant were investigated. The results obtained revealed that ZnO, due to its high dissolution and strong binding capacity, readily accumulated in the root tissues and significantly inhibited the physiological activity of the plant. However, TiO2 had a positive effect on plant physiology, resulting in promoted growth. The results of biochemical experiments implied that ZnO, through the generation of oxidative stress, significantly reduced the chlorophyll content, carotenoids and activity of stress-controlling enzymes. On the contrary, no negative biochemical impact was observed in plants treated with TiO2. For the kinetic uptake and transport study, we designed two exposure systems in which ZnO and TiO2 were exposed to red bean seedlings individually or in a mixture approach. The results showed that in single metal oxide treatments, the uptake and transport increased with increasing exposure period from one week to three weeks. However, in the metal oxide co-exposure treatment, due to complexation and competition among the particles, the uptake and transport were remarkably decreased. This suggested that the kinetic transport pattern of the metal oxide mixtures varied compared to those of its individual constituents.

Item Type: Article
Uncontrolled Keywords: Metal oxides; Physiological impacts; Biochemical impacts; Uptake kinetics; Translocation; Growth inhibition
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QE Geology
Divisions: Faculty of Science > Dept of Chemistry
Faculty of Science > Dept of Geology
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 05 Aug 2019 05:02
Last Modified: 05 Aug 2019 05:02
URI: http://eprints.um.edu.my/id/eprint/21767

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