was achieved for both C14-and C16-BACs within 24 h under gentle shaking (Figure ). Afterwards, the Cw of C14-and C16-BACs remained stable, demonstrating that the chemical supply from PES membrane is sufficient to overcome any possible mass loss (e.g., sorption onto glass beakers). The calculated logarithmic partition coefficients of BACs between PES membrane and water (KPESw) for both chemicals are greater than 4 (Table ), confirming a high sorption affinity of PES membrane for these BACs.