Standard Preparation Method
BPA standard solution(200 µL) was placed in a vial (1mL) and evaporated to dryness under nitrogen at 60 °C. Silylating agent (BSTFA containing 1% TMCS; 100 µL ) was added to the residue and the vial was vortex mixed and heated at 80 °C for 30 min. After cooling, the derivatized solution was evaporated to dryness and the residue was redissolved in 100 µL chloroform. This solution(1 µL) was analysed by GC-MS.
(N,O-Bis(trimethylsilyl)trifluoroacetamide (BSTFA) ,trimethylchlorosilane(TMCS))