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Discovery of AO168 = S as a Novel Environmental Transformation Product of the Antioxidant AO168 in Sediments
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DOI：10.1021/acsestwater.6c00418.png)
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Abstract
En 中文
The widespread use of organophosphorus compounds (OPCs) has increasingly highlighted environmental and health risks, prompting the identification and source apportionment of unknown or overlooked OPCs. A novel organothiophosphate ester (OTPE), tris(2,4-ditert-butylphenyl) phosphorothioate (AO168═S), was identified in surface sediments through nontargeted screening based on high-resolution mass spectrometry. This compound was detected in sediment samples from three typical regions (natural lake, industrial area, and e-waste recycling area), with median concentrations of 12.0, 11.4, and 18.4 ng/g dry weight, respectively. These concentration levels were comparable to or higher than those of traditional organophosphate esters (OPEs). Ecological risk assessment using risk quotients indicated that AO168═S presents potential risks in over half of the sampling sites across three regions. Combined with EPI Suite tool prediction data and existing experimental evidence, AO168═S may exhibit characteristics of environmental persistence, bioaccumulation, and toxicity. Correlation analysis and sediment incubation experiments indicate that AO168═S is a transformation product of the widely used organophosphite antioxidant tris(2,4-ditert-butylphenyl) phosphite (AO168), further uncovering a novel environmental fate of organophosphate antioxidants (OPAs): conversion into OTPEs. This study highlights the importance of understanding the transformation behavior of organophosphorus compounds in sediments.
Keywords:
Antioxidants
Geological materials
Organic compounds
Organophosphorus compounds
Phosphates
organophosphorus compounds
organophosphate antioxidants
tris(2,4-ditert-butylphenyl) phosphorothioate
tris(2,4-ditert-butylphenyl) phosphate
sediments
transformation
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