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Unanticipated Thio-oxidation of Organophosphite Chemical Additives in PVC Microplastics Following In-Situ Weathering
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Researchers discovered unanticipated thio-oxidation of organophosphite chemical additives in PVC microplastics after 16 weeks of in-situ river water weathering, revealing that environmental exposure can chemically transform plastic additives in unexpected ways.
Microplastics have emerged as contaminants of concern due to their worldwide distribution and persistence. Following environmental weathering the chemical composition of microplastics may be altered by physicochemical processes. In this study, nontargeted analysis was employed to examine changes in the chemical composition of five different types of microplastics that had been subjected to 16 weeks of in-situ exposure to flowing river water. The highest number of observed peak features was associated with PVC (12,043), among which 2,086 were newly formed. It was unanticipated that three organothiophosphates, including triphenyl thiophosphate (TPTP), would have the highest abundance following in-situ exposure of PVC microplastics. The abiotic formation of organothiophosphates was confirmed via in-lab simulation trials following 6 weeks of artificial weathering. To further investigate potential reaction mechanisms, triphenyl phosphite (TPPi) and PVC microplastic particles were individually incubated along with five major sulfur species. Elementary sulfur (S8) and sulfide (S2-) were observed to be responsible for the formation of TPTP via the thio-oxidation of TPPi. This is the first known report of thio-oxidation as a transformation pathway, highlighting the importance of considering chemical transformations when conducting microplastic risk assessments.
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Unanticipated Thio-Oxidation of Organophosphite Chemical Additives in PVC Microplastics Following In Situ Weathering
AI summary Read the abstract
Researchers performed nontargeted chemical analysis on PVC microplastics after 16 weeks of river water exposure and unexpectedly found three organothiophosphates — including triphenyl thiophosphate — among 2,086 newly formed compounds, suggesting environmental weathering transforms plastic additives into previously unrecognized contaminants.
UnanticipatedThio-Oxidation of Organophosphite ChemicalAdditives in PVC Microplastics Following In Situ Weathering
AI summary Read the abstract
Researchers performed nontargeted chemical analysis on PVC microplastics after 16 weeks of river water exposure and unexpectedly found three organothiophosphates — including triphenyl thiophosphate — among 2,086 newly formed compounds, suggesting environmental weathering transforms plastic additives into previously unrecognized contaminants.
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