Bisphenol A migration from polycarbonate baby bottle with repeated use

This study was to quantify the migration of bisphenol A (BPA), from new polycarbonate (PC) baby bottle into the water filled in the bottle, with repeated use up to 100 times and extraction by water temperature ranging from 40 °C to 100 °C. BPA was determined by GC–MS, operated in the selected ion monitoring mode. The concentrations of BPA, migrated from brand-new PC baby bottle, were 0.03 ppb and 0.13 ppb at 40 °C and 95 °C, respectively. However, the concentration of BPA from the bottle used for 6 months, were 0.18 ppb and 18.47 ppb at 40 °C and 95 °C, respectively. The levels of BPA migration were rapidly increased when the water temperature was over 80 °C. The variations of BPA level were divided into three regions; lag effect, steady and aging, which showed different increasing rate. PC baby bottle after being utilized 60 times which was correspond to the baby bottle used for 3 months started aging. It also showed an increasing rate of 4.9 × 10−2 ppb time−1. These results are explained by increase in d-spacing of PC baby bottle. The d-spacing of PC baby bottle increases with repeated use from 0.499 nm in brand-new bottles to 0.511 nm with bottles which had been used for 6 months.