manufacturing ghana antioxidant ippd chemical auxiliary agents
manufacturing ghana antioxidant ippd chemical auxiliary agents
manufacturing ghana antioxidant ippd chemical auxiliary agents
manufacturing ghana antioxidant ippd chemical auxiliary agents
manufacturing ghana antioxidant ippd chemical auxiliary agents
  • Do substituted para phenylenediamine (PPD) antioxidants affect the environment?
  • Substituted para -phenylenediamine (PPD) antioxidants have been extensively used to retard oxidative degradation of tire rubber and were found to pervade multiple environmental compartments. However, there is a paucity of research on the environmental occurrences of their transformation products.
  • Are PPD antioxidants toxic?
  • An increasing number of studies have focused on the toxicity of these PPD antioxidants. (8−10,15,33) According to the European Chemical Agency, several of them were labeled as very toxic to aquatic life with long-lasting effects and harmful if swallowed and may cause an allergic skin reaction.
  • Which compound has the highest antioxidant levels in Guangzhou & Taiyuan?
  • The same trend was also observed in its parent compound, 6PPD, which showed the highest proportion among these antioxidants in Guangzhou (46%), with a median level of 1820 pg/m 3, while that in Taiyuan was only 20%, with a median value of 81.0 pg/m 3 ( Table 1 ).

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