Published:
siMPle: Systematic Identification of MicroPLastics in the Environment
siMPle is a freeware for the fast detection of microplatic materials in environmental samples. Its algorithm compares the IR spectra of the sample with each reference spectra in the database, then assigns a material to them along with a probability score. 
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Open-access FTIR Sepctra Library
The FTIR Sepctra Library is critical to detect the plastic particles in the environmental samples. Three useful and open-access IR libraries can be found in papers by Primpke et al. (2020) and Frond et al. (2021). 
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Reference Microplastics for Interlaboratory Calibration
Using proper Reference materials is one of key steps to facilitate comparability of microplastic (1 μm to 5 mm) measurements. Recent work has explored how to prepare reference microplastics for large-scale interlaboratory comparisons. You can find the papers by Oster et al. (2020), Martínez-Francés et al. (2023) and Seghers et al. (2022). 