Abstract
The neptunium sorption by different microplastic materials (MPs) has been studied in laboratory water and seawater samples, which had been previously traced with the Np-237 isotope. The microplastics used were polyethylene terephthalate (PET) and polyamide nylon (PN6), and the investigations included the pH effect and seawater composition on the sorption efficiency. The evaluation of the experimental data (Kd values) revealed that the sorption efficiency does not differ significantly from one microplastic to another and mainly the hydrolysis of Np(V) in alkaline conditions affects the sorption efficiency. In seawater the Kd values decline dramatically because of the increased ionic strength (salinity) and the occurrence of various cations (e.g. Ca2+, Fe2+), which effectively compete Np(V) sorption by the MPs.
Published Version
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