Organic matter removal in microplastic extraction from environmental samples: Challenges and methodological solutions

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• Accurate microplastic (MP) quantification in environmental samples is hindered by organic matter (OM) interference.
• OM can cause issues like reduced separation efficiency, filtration clogs, and signal overlap in analysis.
• Effective MP detection requires protocols that remove OM without altering MP properties.

Purpose of the Study:

• To review and discuss methodologies for digesting biogenic organic matter (OM) from environmental samples.
• To evaluate the impact of OM digestion methods on microplastic (MP) physicochemical properties.
• To identify optimized approaches for MP extraction and characterization.

Main Methods:

• Discussion of various OM digestion techniques: oxidative, acidic, alkaline, and enzymatic.
• Analysis of factors influencing digestion efficiency, including temperature and duration.
• Evaluation of the effects of digestion on MP surface chemistry and size distribution.

Main Results:

• Different digestion methods exhibit varied OM removal efficiencies.
• Combined approaches can enhance OM digestion while minimizing MP damage.
• Optimized digestion preserves polymer stability for accurate MP analysis.

Conclusions:

• Efficient OM removal is critical for reliable microplastic quantification and characterization.
• Careful selection and integration of digestion methods are necessary to preserve MP integrity.
• This work provides insights for developing robust protocols for diverse environmental matrices.