Sajiki Junko, Yonekubo Jun
Chiba Prefectural Institute of Public Health, 666-2 Nitona-cho, Chuo-ku, Chiba 260-8715, Chiba City, Japan.
Environ Int. 2004 Apr;30(2):145-50. doi: 10.1016/S0160-4120(03)00155-7.
To investigate bisphenol-A (BPA) degradation in seawater using Fenton reagents, changes in the BPA recovery and in the concentration of BPA metabolite, BPA-o-quinone in the three water samples; BPA free deionizad water (control water), 3% aq. NaCl and seawater as a function of time after BPA fortification in the presence of radical oxygen species (ROS) at 20 degrees C were investigated. The BPA recoveries were lower in both 3% aq. NaCl and seawater than in the control water. The BPA recovery in aq. NaOCl decreased as a function of NaOCl concentration, indicating that BPA could be degraded by the potent radical ion (OCl-) at the concentration of above 2 microM. A BPA metabolite, BPA-o-quinone was formed in all the water samples after addition of ROS which was produced by Fenton reaction (reaction of 0.11 M H2O2 and 0.44 mM FeCl3.6H2O). These results indicated that BPA degradation could occur by an addition of ROS and further accelerated by the formation of OCl- in salt containing water samples. BPA recovery was the highest in seawater immediately after addition of Fenton reagents and the amount of BPA-o-quinone was very low, which suggests that seawater possesses an inhibitory system on BPA degradation. There was a positive correlation (p<0.01) between the fortified iron concentration and turbidity in seawater. Turbidity might be originated from iron-binding substances. Degradation threshold of BPA was observed when Fenton reaction was employed in seawater fortified with high amount of BPA. The present study suggested that iron trapping caused an inhibition on BPA degradation by Fenton reagents.
为了研究使用芬顿试剂在海水中双酚A（BPA）的降解情况，研究了在20℃下，在存在活性氧（ROS）的情况下，三种水样（不含BPA的去离子水（对照水）、3%的氯化钠水溶液和海水）中BPA回收率以及BPA代谢产物BPA -邻醌浓度随时间的变化。在3%的氯化钠水溶液和海水中，BPA的回收率均低于对照水。在次氯酸钠水溶液中，BPA的回收率随次氯酸钠浓度的增加而降低，这表明在浓度高于2 microM时，强效自由基离子（OCl-）可使BPA降解。在添加由芬顿反应（0.11 M H2O2与0.44 mM FeCl3·6H2O反应）产生的ROS后，所有水样中均形成了BPA代谢产物BPA -邻醌。这些结果表明，添加ROS可导致BPA降解，并且在含盐水样中形成OCl-可进一步加速降解。添加芬顿试剂后，海水中BPA的回收率立即达到最高，且BPA -邻醌的量非常低，这表明海水对BPA降解具有抑制系统。海水中强化铁浓度与浊度之间存在正相关（p<0.01）。浊度可能源自铁结合物质。在用大量BPA强化的海水中使用芬顿反应时，观察到了BPA的降解阈值。本研究表明，铁的捕获对芬顿试剂降解BPA产生了抑制作用。
