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Microplastic quantification of nylon and polyethylene terephthalate by chromic acid wet oxidation and ultraviolet spectrometry
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Researchers developed a chromic acid wet oxidation method to quantify polyethylene terephthalate (PET) and Nylon 66 (NY) microplastics by adapting the Walkley-Black titration to measure organic carbon content in synthetic polymer samples. Near-complete oxidation was achieved at 135-140 degrees C, and combining this method with UV/VIS spectrometry enabled accurate quantification of PET and NY content in mixed samples.
Microplastics are ubiquitous and their quantification in an environmental sample is important. This study modified the Walkley–Black titration method to measure the organic content of a synthetic sample containing polyethylene terephthalate (PET) or/and Nylon66 (NY) dissolved in a concentrated sulfuric acid solution, which was further converted to mass by incorporating the factors of carbon mass ratios by their molecular structures. The PET mass in concentrated sulfuric acid was also measured using UV/VIS spectrophotometer. The experimental results from the chromic acid wet oxidation showed that almost-complete oxidation of PET and NY by dichromate was achieved at the elevated temperature of 135 ∼ 140 °C, and the organic carbon resulting from existing PET and NY can be determined accurately. This study is a pioneer investigation using wet oxidation for PET and NY quantification. A step-by-step protocol was proposed to delineate the operating procedure of the modified chromic acid wet oxidation. By incorporating the UV/VIS spectrometry with chromic acid wet oxidation, the PET and NY content in a synthetic sample can be quantified.
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