Crater-Spectrum Feature Fusion Method for Panax notoginseng Cadmium Detection Using Laser-Induced Breakdown...

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Environmental Science

Background:

• Panax notoginseng is a valuable herb with medicinal and dietary uses.
• Cadmium accumulation in P. notoginseng poses environmental and health risks.
• Accurate detection of cadmium is crucial for ensuring product safety.

Purpose of the Study:

• To develop a rapid and accurate method for detecting cadmium (Cd) in P. notoginseng.
• To reduce signal uncertainty in laser-induced breakdown spectroscopy (LIBS) for improved quantification.
• To validate a novel crater-spectrum feature fusion method for toxic metal detection.

Main Methods:

• Employed laser-induced breakdown spectroscopy (LIBS) for rapid Cd detection.
• Developed a crater-spectrum feature fusion method, including ablation crater morphology compensation and characteristic peak ratio correction (CPRC).
• Utilized multiple linear regression (MLR) and least-squares support vector machine (LSSVM) models for data analysis.

Main Results:

• Crater morphology compensation reduced RMSEP from 7.0233 to 5.4043 μg/g.
• CPRC pretreatment achieved an RMSEP of 3.4980 μg/g, with a limit of detection of 1.92 μg/g.
• The crater-spectrum feature fusion method with LSSVM yielded the lowest RMSEP of 2.8556 μg/g.

Conclusions:

• The crater-spectrum feature fusion method effectively reduces signal uncertainty for Cd detection in P. notoginseng.
• This method offers a promising approach for ensuring the quality and safety of agricultural products.
• The technique has potential for detecting other toxic metals in various matrices.