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Effects of Chemical Pretreatment on Natural Fibers Removal and Microplastics Integrity for Wastewater Characterization
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Researchers tested nine different chemical digestion protocols for removing natural fibers (like cotton and cellulose) from wastewater samples before counting microplastics, a critical step because natural fibers can look like synthetic particles and inflate counts. A sequential bleach-then-hydrogen-peroxide treatment at low temperatures proved most effective — fully removing natural fibers while preserving synthetic polymer integrity. Standardizing such methods is essential for producing comparable microplastic measurements across laboratories and regulatory programs worldwide.
Nine digestion protocols were tested to quantify microplastics in wastewater using nine polymeric and three natural fiber controls representative of common microplastics in wastewater. Protocols were also evaluated for their impact on natural fibers, which can interfere with microplastic quantification. Control size change and visual integrity were assessed, revealing that a sequential 24-h treatment with 6% NaClO at room temperature (RT) followed by 24 h with 30% H2O2 at 40 °C preserved polymer integrity while fully oxidizing natural fibers, even when preincubated in real wastewater samples. A Fourier-transform infrared spectroscopy (FTIR) validation using the carbonyl index (CI) and carbon-oxygen index (COI) showed significant changes in poly-(ethylene terephthalate) (PET) and polyvinyl chloride (PVC) after digestion but did not compromise FTIR spectrum recognition. The protocol applied to raw wastewater samples showed optimal performance at 300 mg Cl2/L, achieving up to 95% Chemical Oxygen Demand (COD) and 92% turbidity reduction. No further improvements in COD or turbidity removal were observed beyond this dose, regardless of initial COD levels. The present approach affords greater comparability with existing studies thanks to a large range of polymeric, natural controls, and oxidant dose investigations regarding common water quality parameters.
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Effects of ChemicalPretreatment on Natural FibersRemoval and Microplastics Integrity for Wastewater Characterization
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Researchers tested nine digestion protocols for removing natural fibers from wastewater samples prior to microplastic quantification, evaluating polymer integrity and natural fiber oxidation across nine polymeric and three natural fiber controls. A sequential treatment of 6% sodium hypochlorite followed by 30% hydrogen peroxide at 40 degrees C proved optimal, fully oxidizing natural fibers while preserving microplastic particle integrity.
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Researchers evaluated nine chemical digestion protocols for microplastic analysis in wastewater, testing their effects on nine polymer types and three natural fiber controls to identify treatments that remove interfering natural fibers without damaging microplastic particles. The sequential NaClO/H2O2 protocol at controlled temperatures achieved complete natural fiber oxidation while maintaining polymer integrity across all tested microplastic types.
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