Hyperspectral imaging as an emerging tool to analyze microplastics: A systematic review and recommendations for future development

Microplastics and Nanoplastics

Table 2 Articles included in the systematic review. Some authors analyze plastic particles in environmental samples while others use spiked samples for the development of HSI methods. Size ranges given in μm were not always completely reported and thus some are reported as either a maximum or minimum size analyzed by the authors

Type of study/sample	MP size range collected/analyzed (μm)	Collection method/origin of particle	Sample clean-up/preparation	Reference
Seawater	300–500	Manta trawl	Size fractionation, enzymatic digestion, peroxide oxidation, filtration	[54]
	250–5000	Manta trawl	Visual selection	[55]
	> 63	Niskin bottle	Ethanol, peroxide oxidation, filtration	[56]
	> 333 (trawl) > 50 (pump)	Manta trawl and in-situ pump	Visual selection	[57]
	> 500	Manta trawl	No description given	[58]
Sand/soil	> 100	Quadrat sample	Size fractionated, collected in petri dish	[59]
Sand/soil	500–5000	Quadrat sample	Density separation, visual selection	[60]
Biota	100–1000	Purchase of fish from local market	Rinsing & scraping of intestinal tract, smear on Teflon plate	[61]
Methodology study	180–647,000	Pristine pellets purchased from manufacturer, collection of urban waste	Manually cut or milled into smaller particles	[62]
	< 2	Polymer matrix synthesized in lab	Photodegradation to produce nanoparticles	[63]
	200–3000	Pristine pellets purchased from manufacturer; local household items collected	Grinding and size fractionation by metal sieve or manual cutting	[64]
	200–3000	Manta trawl in seawater	Filtration of seawater samples	[64]
	100–5000	Pristine pellets and large plates purchased from manufacturer	Manually cut into smaller particles	[65]