Abstract— The widespread use of silver nanoparticles (Ag NPs) has facilitated their uninterrupted entry into various ecosystems. Nanoparticles are stabilized using a variety of approaches for various applications. The present study has investigated the uptake of polyvinylpyrrolidine (PVP) coated Ag NPs in a terrestrial system. Two insect (Acheta domesticus and Tenebrio molitor) and two plant species (Sorghum vulgare and Helianthus annuus) were used in the study. The effect of concentration and size of PVP-coated Ag NPs was investigated. The test species were maintained in soil spiked with 0, 1, 5, 25, 125, and 625 mg/kg PVP-coated 30-50 nm Ag NPs to test the effect of concentration of Ag NPs on uptake. Similarly, the test species were maintained in soil spiked with 25 mg/kg of 20, 30-50, and 50-80 nm PVP-coated Ag NPs to study the effect of size of nanoparticles on uptake. The PVP-coated Ag NPs were characterized using transmission electron microscopy, dynamic light scattering and powder X-ray diffraction techniques. The levels of silver in test samples were measured using inductively coupled plasma-optical emission spectroscopy. A concentration dependent increase in the levels of Ag in both the insect species was observed as a function of increasing concentrations of coated Ag NPs in soil. An increase in the levels of Ag as a function of increasing size of coated Ag NPs was observed with Acheta domesticus. No apparent trend was observed with Tenebrio molitor species. A concentration dependent increase in the levels of Ag in the roots of both the plants was observed as a function of increasing concentrations of coated Ag NPs in soil. Additionally, the translocation of Ag to other plant tissues was observed in Helianthus annuus, a dicot plant.
Keywords— Silver nanoparticles, polyvinylpyrrolidine, Acheta domesticus, Tenebrio molitor, Sorghum vulgare, Helianthus annuus, inductively coupled plasma-optical emission spectroscopy.
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