Humic acids modify the pulse size distributions in the characterization of plastic microparticles by Tunable Resistive Pulse Sensing

A - Papers appearing in refereed journals

Vazquez Juiz, M.L., Soto Gomez, D., Perez Rodriguez, P., Paradelo, M. and Lopez Periago, J. E. 2018. Humic acids modify the pulse size distributions in the characterization of plastic microparticles by Tunable Resistive Pulse Sensing. Journal of Contaminant Hydrology. 218, pp. 59-65. https://doi.org/10.1016/j.jconhyd.2018.10.008

AuthorsVazquez Juiz, M.L., Soto Gomez, D., Perez Rodriguez, P., Paradelo, M. and Lopez Periago, J. E.
Abstract

Tunable Resistive Pulse Sensing, TRPS, is an emerging technique used in quantification and measuring the size (particle-by-particle) of viruses, exosomes and engineered colloidal spheres in biological fluids. We study the features of TRPS to enhance size characterization and quantification of submicron-sized microplastics, also called plastic microparticles, MP, in freshwater environments. We report alterations on the detection of the resistive pulses in the TRPS caused by humic acids, HA, during the size measurement of polystyrene microspheres used as MP surrogate. We discuss the alteration of the electric field in the measuring channel of the TRPS apparatus induced by the passage of HA. TRPS is a fast and precise technique for counting and size determination of MP but needs the evaluation of the influence of the organic matter on the current blockades. We show that statistical clustering models of the magnitude distribution of the resistive pulses can help to detect and quantify changes in the pulse size distributions induced by flocculation of humic acids. Conclusions of this study indicate that TRPS can be a valuable tool to improve the knowledge of the MP fate in surface waters, in the vadose zone and groundwater

KeywordsColloid; Flocculation; Finite Gaussian Clustering; Humic Acids; Particle size; Microplastics; Tunable resistive pulse sensing; TRPS
Year of Publication2018
JournalJournal of Contaminant Hydrology
Journal citation218, pp. 59-65
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jconhyd.2018.10.008
Web address (URL)https://doi.org/10.1016/j.jconhyd.2018.10.008
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 1 (WP1) - Optimising nutrient flows and pools in the soil-plant-biota system
Output statusPublished
Publication dates
Online16 Oct 2018
Publication process dates
Accepted12 Oct 2018
PublisherElsevier Science Bv
Copyright licenseCC BY
ISSN0169-7722

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