Automatic trace-enrichment of bisphenol A by a novel continuous flow liquid membrane extraction technique

摘要

Bisphenol A was enriched by a novel continuous flow liquid membrane extraction technique, which is based on the combination of continuous flow liquid-liquid extraction and a supported liquid membrane. Related parameters such as flow rates, liquid membrane solvents, and pH of donor and acceptor were optimized. Using dichloromethane as liquid membrane, over 200-fold enrichment of 50 mug L-1 BPA was obtained after a 40-min enrichment time. The major advantages of this technique are that it provides a relatively high enrichment factor, freedom of choice and long term stability of the liquid membrane, much lower consumption of organic phase, typically 0.05 mL min(-1), scope for full automation, and easy on-line coupling to various detectors.