BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT SUMMARY:Transforming BPA Derivatives by Birnessite LOCATION:Chemistry A101 TZID:America/Denver DTSTART:20220216T160000 UID:2026-04-23-23-09-23@natsci.colostate.edu DTSTAMP:20260423T230923 Description:Literature Seminar:\n\n \;\n\nThe prevalence and use of pla stic has long been a source of both environmental and human health concern . Plastic is produced using bisphenol A (BPA)\, a non-naturally occurring chemical\, that may enter the environment due to wastewater\, leaching fro m products\, and through human waste. Humans\, generally\, are exposed to BPA through consumption of food or drink stored in plastic containers cont aining BPA. Due to public pressure\, and in some cases government bans\, m anufactures have used bisphenol AF (BPAF) and bisphenol S (BPS) to manufac ture their plastic products. However\, BPA\, BPAF and BPS all can have end ocrine disrupting effects in the human body. The fate of BPA in the enviro nment was poorly understood before the introduction of these derivatives\, so an important task we face today is understanding how these compounds a re transformed in the environment. Birnessite\, a naturally occurring mang anese oxide\, is shown to be a powerful oxidant. Due to its prevalence in the environment\, it is worth studying birnessite’s interactions with BP AF and BPS. Li\, J. et al. (2018) employed three different high pressure l iquid chromatography techniques in order to understand the efficacy\, prod ucts\, and varying conditions (such as mineral concentration\, pH\, and io dide concentration) of the interaction between birnessite and the BPA deri vatives. Iodide concentration was a variable in this study due to its envi ronmental presence and previous studies showing it enhanced BPA transforma tion. It was hypothesized that due to birnessite’s capability to oxidize iodide to molecular iodide and hypoiodous acid\, the resulting transforma tion products may be iodinated. They show that birnessite was less efficie nt at transforming BPAF and BPS\, however\, found that high concentrations of iodide at neutral pH increased transformation extent. Several transfor mation products\, iodinated and not\, were identified along with proposed reaction pathways. Future studies will continue to focus on how the produc ts may affect living systems\, and how the mineral surface may be changed as a result of these interactions.\n\n \;\n\n(1)       Li\, J.\; Pang\, S. Y.\; Zhou\, Y.\; Sun\, S.\; Wang\, L.\; Wang\, Z.\; Gao\, Y.\; Y ang\, Y.\; Jiang\, J. Transformation of Bisphenol AF and Bisphenol S by Ma nganese Dioxide and Effect of Iodide. Water Research 2018\, 143\, 47–55. https://doi.org/10.1016/j.watres.2018.06.029. 4:00 pm END:VEVENT END:VCALENDAR