Waste polystyrene foam-derived sorbent for determining bisphenol-A from canned beverages

Polystyrene-based products are widely used in industrial and daily activities, but their subsequent disposal can negatively affect the environment. This work focuses on reducing polystyrene waste into useful material. A waste-derived polystyrene sorbent (WDPS) was fabricated and successfully applied to determine bisphenol-A in canned beverages. High-performance liquid chromatography with a diode-array detection (HPLC-DAD) was applied to quantify bisphenol-A. Good linearity at a concentration range of 2.5-50 μg L^-1 was achieved. The limit of detection was 0.93 ± 0.02 μg L^-1. Good precision (RSDs < 1.6 %, 4 concentrations, n = 6) in spiked coconut juice samples were obtained. The contamination of BPA in canned beverage samples were found in the range of 6.3 ± 0.2 μg L^-1 to 27.0 ± 1.0 μg L^-1 with recoveries in the range of 70.4 ± 1.6 % to 82.4 ± 0.4 %. This proposed method also offers reduced polystyrene waste, reuse as a sorbent, and recycling after use.