{Reference Type}: Journal Article
{Title}: Do nanoplastics impact Pb up-taking by Hordeum vulgare L.?
{Author}: Ryzhenko N;Dutruch L;Tabo B;Pecheul G;Pattier M;Khatib I;Pédrot M;Gigault J;Cabello-Hurtado F;El Amrani A;Davranche M;
{Journal}: NanoImpact
{Volume}: 35
{Issue}: 0
{Year}: 2024 Jul 6
{Factor}: 6.038
{DOI}: 10.1016/j.impact.2024.100526
{Abstract}: Most studies on nanoplastics (NPs) focus on aquatic environments, overlooking their combined bioaccumulation with pollutants in terrestrial ecosystems. This study addresses a part of this gap by investigating how polystyrene nanoplastics (PS-NPs) affect the bioaccumulation and translocation of lead (Pb) in Hordeum vulgare L. plants. Using the RHIZOtest device for precise soil contamination control, we quantified PS-NPs (50 nm) in plant shoots via pyrolysis-gas chromatography/mass spectrometry (Py-GCMS) after plant KOH digestion. Our findings revealed that PS-NPs reduce Pb bioaccumulation and make adsorbed Pb onto PS-NPs less bioavailable to plants. For the highest Pb concentration, the Pb uptake index (PUI) followed the trend: Free Pb > NPs + Pb > Pb primary adsorbed by NPs, showing reduced Pb translocation to shoots in the presence of PS-NPs. Moreover, the presence of Pb decreased the bioavailability of PS-NPs probably in response to PS-NPs aggregation or modified charge. The PS-NPs concentrations in shoots range from 275.2 to 400 μg g-1, representing 3.9 to 5.75% of the total PS-NPs. This study highlights the intricate interactions between nanoplastics and metals in soil-plant systems and emphasizes the need for further research on their combined effects and potential risks to food safety.