<i>In situ</i> Detection of Microplastics: Single Microparticle‐electrode Impacts

Shimizu, K.; Sokolov, Stanislav V.; Kätelhön, Enno; Holter, Jennifer; Young, Neil P.; Compton, Richard G.

doi:10.1002/elan.201700213

Cited by 20 publications

(20 citation statements)

References 42 publications

(16 reference statements)

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“…The current spike in chronoamperogram was due to MP collision with the working electrode due to the reduction of oxygen in PE MP particles. Using this method, an excellent correlation was established between the frequency of the spikes and MP particle concentrations, with an R2 value of 0.96 (Shimizu et al, 2017). Overall, this method of detection provided a more reliable and accurate measurement of MP compared to conventional methods.…”

Section: Electrochemical Sensors For Microplasticsmentioning

confidence: 83%

“…(E) Optical microscopy images of the carbon fiber electrode in the absence and presence of MPs (left). The chronoamperogram (right) of the PE MPs (blue line) and in the absence of MPs (black line) (the inset provides an enlarged view of a transient current-time signal resulting from a collision event between MP and electrode (Shimizu et al, 2017). (F) Schematic of a device for continuous MP sorting based on MP electrophoretic mobilities, showing BPE across microchannel.…”

Section: Electrochemical Remediation Of Microplasticsmentioning

confidence: 99%

“…Particle impact electrochemistry has also been utilized in the detection of spherical PE MPs (1-22 µm) (Shimizu et al, 2017). The particle-electrode impact method is widely used to study particles suspended in solution.…”

Section: Electrochemical Sensors For Microplasticsmentioning

confidence: 99%

See 2 more Smart Citations

Emerging electrochemical tools for microplastics remediation and sensing

Martić

Tabobondung²,

Gao³

et al. 2022

Front. Sens.

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Microplastics (MPs) are a part of our daily lives and persist in the environment all across the globe. As a recently recognized emerging pollutant, there is a call to action to mitigate and monitor microplastics. Despite traditional remediation and characterization methodologies, MP-related challenges still exist. Electrochemical strategies for microplastic remediation have been reported in recent years, but very few reports exist on using electrochemical sensors for monitoring microplastics. Therefore, this minireview highlights the opportunities within the existing electrochemical remediation platforms towards sensor design and development, and elaborates on microplastic electrochemical sensors so far.

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Section: Electrochemical Sensors For Microplasticsmentioning

confidence: 83%

Section: Electrochemical Remediation Of Microplasticsmentioning

confidence: 99%

See 1 more Smart Citation

Emerging electrochemical tools for microplastics remediation and sensing

Martić

Tabobondung²,

Gao³

et al. 2022

Front. Sens.

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“…Electroanalytical techniques provide useful chemical-physical information in the study of micro and nanomaterials or nanoparticles [ 5 – 8 ], but have not been used together for pollutants adsorbed on them. Faradaic particle-electrode impact electrochemistry has been used to study polyethylene (PE) microparticles suspended in an aqueous solution using carbon-fiber microelectrodes, which allows identification, particle size distribution, and concentrations for microparticles of sizes 1–10 µm [ 9 ]. There is no posibility of direct faradaic electron transfer from the polyethylene particles themselves due to the fact that PE is an insulator, but cathodic current spikes are due to solubility of electroactive oxygen in PE microparticles.…”

Section: Introductionmentioning

confidence: 99%

Detection, quantification, and characterization of polystyrene microplastics and adsorbed bisphenol A contaminant using electroanalytical techniques

Vidal,

Midón,

Vidal

et al. 2023

Microchim Acta

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The potential applications of electroanalytical techniques for the quantification and size characterization of nonelectroactive polystyrene microplastics is reported, in addition to characterizing the kinetics of adsorption of bisphenol A on these polystyrene microparticles. The individual adsorption events of very diluted polystyrene microparticles dispersions on glassy-carbon microelectrodes produce the blocking of the charge transfer of a mediator (ferrocene-methanol) thus decreasing the current of the recorded chronoamperogram in a stepwise manner. The magnitude of the current steps are in the order of pA values and can be related to the diameter of the plastic microparticles in the size range 0.1 to 10 µm. The frequency of the current steps in the domain time used (120 s) allows to quantify the number concentration of these microparticles in the range 0.005 to 0.500 pM. Electrochemical impedance spectroscopy confirms the adsorption of the polystyrene microplastics on carbon microelectrodes (and to a lesser extent on platinum microelectrodes) under the same experimental conditions as above. On the other hand, the adsorbed microplastics become concentrators of other pollutants found in the environment. The sensitive differential-pulse voltammetry determination of bisphenol A (linear range 0.80–15.00 µM; detection limit 0.24 µM) was used together with a simple separation procedure for studying the adsorption of bisphenol A on polystyrene microparticles. The adsorption capacity (mg of bisphenol A retained per g of the polystyrene microplastics) decreased from approximately 5.7 to 0.8 mg g−1 with increasing dosages of polystyrene microparticles from 0.2 to 1.6 g l−1. The adsorption isotherms were modeled resulting in a monolayer of bisphenol A adsorbed on the microplastics (i.e., best fitted to a Langmuir model). Graphical abstract

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“…As a simple prototypical application, we show here that ultralow concentrations of positively charged microparticles can be detected via ORR-driven blockade impact electrochemistry. This approach is distinct from and complementary to an earlier study of detection based on oxygen-carrying microparticles . Plastic particles are of increasing concern as a health issue: they have been detected in drinking water, and their accumulation and toxicity have been studied in plants, plankton, algae, bacteria, and even in human blood .…”

Section: Introductionmentioning

confidence: 99%

Utilizing the Oxygen Reduction Reaction in Particle Impact Electrochemistry: A Step toward Mediator-Free Digital Electrochemical Sensors

Moazzenzade,

Huskens,

Lemay

2023

ACS Omega

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The current blockade particle impact method opens a route toward highly parallelized single-entity electrochemical assays. An important limitation is, however, that a redox mediator must be present in the sample, which can detrimentally interfere with molecular recognition processes. Dissolved O2 that is naturally present in aqueous solutions under ambient conditions can in principle serve as a suitable mediator via the oxygen reduction reaction (ORR). Here, we demonstrate the validity of this concept by performing current blockade experiments to capture and detect individual microparticles at Pt microelectrodes using solely the ORR. The readout modality is independent of the absolute O2 concentration, allowing operation under varying conditions. We further determine how the trajectories of individual microparticles are influenced by the combination of electrophoresis and electroosmotic flows and how these can be utilized to provide continuous detection of cationic particles in water for environmental monitoring.

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In situ Detection of Microplastics: Single Microparticle‐electrode Impacts

Cited by 20 publications

References 42 publications

Emerging electrochemical tools for microplastics remediation and sensing

Emerging electrochemical tools for microplastics remediation and sensing

Detection, quantification, and characterization of polystyrene microplastics and adsorbed bisphenol A contaminant using electroanalytical techniques

Utilizing the Oxygen Reduction Reaction in Particle Impact Electrochemistry: A Step toward Mediator-Free Digital Electrochemical Sensors

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