Impact of nanoparticle surface charge and phosphate on the uptake of coexisting cerium oxide nanoparticles and cadmium by soybean (<i>Glycine max. (L.) merr</i>.) Hamidreza Sharifan Xiaoxuan Wang Xingmao Ma 10.6084/m9.figshare.9752360.v1 https://tandf.figshare.com/articles/journal_contribution/Impact_of_nanoparticle_surface_charge_and_phosphate_on_the_uptake_of_coexisting_cerium_oxide_nanoparticles_and_cadmium_by_soybean_i_Glycine_max_L_merr_i_/9752360 <p>Engineered nanoparticles (ENPs) often interact closely with coexisting environmental pollutants; however, the effect of their surface properties on such interactions in a plant system has not been examined. This study investigated the roles of ENP surface charge and growth media chemistry on the mutual effects of cerium oxide nanoparticles (CeO<sub>2</sub>NPs) and cadmium (Cd) on their plant uptake and accumulation in a hydroponic system. Soybean seedlings were exposed to five nanoparticle/Cd treatments including: 100 mg L<sup>−1</sup> CeO<sub>2</sub>NPs<sup>(+)</sup>; 100 mg L<sup>−1</sup> CeO<sub>2</sub>NPs<sup>(−)</sup>; 100 mg L<sup>−1</sup> CeO<sub>2</sub>NPs<sup>(+)</sup> + 1 mg L<sup>−1</sup> Cd; 100 mg L<sup>−1</sup> CeO<sub>2</sub>NPs<sup>(−)</sup> + 1 mg L<sup>−1</sup> Cd; and 1 mg L<sup>−1</sup> Cd only, in the presence or absence of 15 mg L<sup>−1</sup> phosphorous in the form of phosphate. After 4 days of exposure, concentrations of Cd and Ce in plant tissues were quantified by inductively coupled plasma-mass spectrometry. Roots exposed to CeO<sub>2</sub>NPs<sup>(+)</sup> contained 87% higher Ce than plants exposed to CeO<sub>2</sub>NPs<sup>(−)</sup>. Phosphate significantly increased the root concentration of Ce by 61% and 66% exposed to CeO<sub>2</sub>NPs<sup>(+)</sup> and CeO<sub>2</sub>NPs<sup>(−)</sup>, respectively. The mutual effect of CeO<sub>2</sub>NPs and Cd was also affected by phosphate, and the net effect of phosphate depended upon the surface charge of CeO<sub>2</sub>NPs.</p> 2019-08-30 12:26:42 Cadmium cerium oxide nanoparticles phosphorous surface charge soybean