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Computer-Assisted Analysis of Microplastics in Environmental Samples Based on μFTIR Imaging in Combination with
Benedikt Hufnagl1,2, Michael Stibi2, Heghnar Martirosyan3
1Institute of Chemical Technologies and Analytics, Vienna University of Technology, A 1060 Vienna, Austria.
Environmental Science & Technology Letters
|January 17, 2022
Summary
Automated microplastic analysis using random decision forests accurately identifies over 20 polymer types in complex environmental samples. This machine learning approach enhances speed and precision for scalable microplastic detection services.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Spectroscopy
Background:
- Automated microplastic analysis is crucial for scalable detection services.
- Current spectral library search methods have limitations in accuracy and robustness.
- Advanced machine learning approaches are needed for complex environmental samples.
Purpose of the Study:
- To develop and evaluate a model-based machine learning approach for analyzing microplastic spectroscopic data.
- To improve the accuracy, speed, and ease of use in microplastic identification.
- To assess the model's performance on large micro-Fourier transform infrared (FPA-μFTIR) datasets from environmental samples.
Main Methods:
- Utilized a model-based machine learning approach employing random decision forests.
- Applied the model to analyze large FPA-μFTIR datasets of environmental samples.
- Conducted Monte Carlo cross-validation to compute error rates like sensitivity, specificity, and precision.
Main Results:
- The random decision forest model successfully distinguished between over 20 different polymer types.
- The model demonstrated applicability to complex environmental matrices.
- Performance was validated across eight diverse datasets, showing robust identification capabilities.
Conclusions:
- Model-based machine learning, specifically random decision forests, offers a powerful and accurate method for microplastic analysis.
- This approach overcomes limitations of traditional spectral library searches for complex samples.
- The developed model supports scalable microplastic analysis services for non-research laboratories.
