Honors College Thesis
 

Analysis of Chemical Leaching from Common Consumer Plastic Bottles Under High Stress Conditions

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https://ir.library.oregonstate.edu/concern/honors_college_theses/x920fz83j

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  • There has been much controversy in recent years over the leaching of chemicals from plastic water bottles. In this study, two of the most common plastics used in water bottles, polyethylene terphthalate (PETE) and polycarbonate (PC) were studied. The leaching of the chemical bisphenol-A (BPA) from polycarbonate (Nalgene ™, Camelback ™) water bottles was studied to examine the validity of these claims by exposing polycarbonate bottles to various conditions and analyzing how much BPA leaches into water contained in the bottles. New polycarbonate bottles were filled with water and exposed to treatment conditions ranging from 65 to 120 ⁰C. A reverse-phase solid phase extraction process was developed to extract BPA from the water and concentrate it into an organic phase. GC/MS was used to analyze the organic extract. BPA was only found to leach in detectable amounts (< 10ppb) when the bottles were exposed to 120 ⁰C water for 2 hours. Polyethylene terephthalate bottles were also tested and were exposed to sunlight for three months during the summer. Small amounts of the plasticizer DEHP were found to leach after several months. A method for determining what chemicals would leach from BPA-Free Tritan™ copolyester was also developed but not tested due to time constraints. An analysis of internal stress due to high humidity and temperature was performed on these BPA-Free bottles.
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