Laser Direct Infrared Spectroscopy: A cutting-edge approach to microplastic detection in environmental samples
P. Chandran, S. Veerasingam
Abstract
Microplastic pollution has emerged as a significant global environmental concern, affecting marine, terrestrial, and atmospheric ecosystems. As microplastic contamination continues to intensify, the need for precise, efficient, and scalable detection method is growing. This review highlights recent advancements in microplastic detection technologies, with a particular focus on Laser Direct Infrared (LDIR) spectroscopy. Utilizing a Quantum Cascade Laser (QCL), LDIR offers rapid, sensitive, and automated detection capabilities. It significantly reduces analysis time compared to conventional techniques such as Fourier Transform Infrared (FTIR) and Raman spectroscopic techniques, making it ideal for large-scale environmental monitoring. Its ability to identify particles as small as 10 μm, combined with enhanced wavelength accuracy, positions LDIR as a promising tool for microplastic analysis across various environmental matrices. Despite some limitations, such as a narrower spectral range, LDIR's superior speed and precision make it a critical advancement for understanding and addressing the global microplastic crisis. • LDIR powered by QCL offers rapid and precise MP detection. • LDIR detects MP particles as small as 10 μm in seconds, unlike FTIR or Raman. • Automated LDIR processes large samples efficiently for high throughput. • LDIR scans multiple particles in environmental samples like water, sediment, & air. • LDIR overcomes conventional limits, advancing global MP research.