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Determination of Polystyrene Nanoparticles in Aqueous Solutions by Dual-Beam Thermal Lens Spectrometry
Summary
Researchers demonstrated that thermal lens spectrometry can detect polystyrene nanoparticles as small as 65 and 80 nanometers in water at very low concentrations, down to 0.0005 mg/L. The technique also revealed how increasing nanoparticle concentrations change the thermal properties of the water in a nonlinear way. The study suggests thermal lens spectrometry could be a sensitive, practical tool for monitoring nanoplastic contamination in aquatic environments.
Polymer micro- and nanoparticles, commonly known as microplastics, are significant environmental pollutants. Even low concentrations of microplastics can affect ecosystems and human health, underscoring the urgent need in detecting these particles in low concentrations while simultaneously assessing the physicochemical parameters of the studied systems. Thermal lens spectrometry (TLS) has effectively detected polystyrene particles measuring 65 and 80 nm within a concentration range of 0.0005–0.15 mg/L in their aqueous dispersions. The comprehensive TLS data also facilitated the evaluation of the thermal diffusivity of these solutions. An increase in the concentration of polystyrene nanoparticles in water results in a nonlinear change in thermal diffusivity.
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