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Chromatograms of the LC/DAD/MS analysis of the diluted (20×) IPA reflux sample from unprocessed PVC, showing epoxidized soybean oil-related extractables. a APCI positive mode, b APCI negative mode, c UV 210–380 nm. Internal standard solution: palmitic acid-d31 (499 mg/L) and Tinuvin 327 (51.95 mg/L)
