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Article Dans Une Revue AQUA — Water Infrastructure, Ecosystems and Society Année : 2023

How suitable is the gold-labelling method for the quantification of nanoplastics in natural water?

Résumé

Nanoplastics are detected in surface water, yet accurately quantifying their particle number concentrations remains a significant challenge. In this study, we tested the applicability of a gold-labelling method to quantify nanoplastics in natural organic matter (NOM) containing water matrices. Gelatin-coated gold nanoparticles (Au-gel NPs) form conjugates with nanoplastics via electrostatic interaction which produces peak signals which can be translated into particle number concentration using single-particle inductively coupled plasma-mass spectrometry (SP-ICP-MS). We used water samples with various NOM concentrations, with and without the addition of 1 Â 10 7 particle-1 nanoplastics. Our results indicate that nanoplastics in low NOM samples (,1 mg•C L À1) could be successfully quantified. However, in high NOM samples (.15 mg•C L À1), only 13-19% of added nanoplastics were successfully quantified. Further digestion to remove NOM yielded only 10% of spiked nanoplastics. This discrepancy in high NOM samples could likely be attributed to the competition between nanoplastics and NOM existing in the water sample to bind with Au-gel NPs. Our study highlights the suitability of the Au-gel labelling method for quantifying nanoplastics in low NOM water samples. Nevertheless, further optimization, including pre-digestion steps, is essential to apply this method for high NOM water samples effectively.
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hal-04408839 , version 1 (22-01-2024)

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Februriyana Pirade, Kim Maren Lompe, Javier Jiménez-Lamana, Sulalit Bandyopadhyay, Katharina Zürbes, et al.. How suitable is the gold-labelling method for the quantification of nanoplastics in natural water?. AQUA — Water Infrastructure, Ecosystems and Society, 2023, 72 (12), pp.2347 - 2357. ⟨10.2166/aqua.2023.278⟩. ⟨hal-04408839⟩
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