Psillakis Elefteria, Mantzavinos Dionissios, Kalogerakis Nicolas
Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, Chania, Crete GR-73100, Greece.
Chemosphere. 2004 Feb;54(7):849-57. doi: 10.1016/j.chemosphere.2003.09.039.
The sonochemical degradation of aqueous solutions containing low concentrations of six phthalate esters at an ultrasonic frequency of 80 kHz has been investigated. Ultrasonic treatment was found capable of removing the four higher molecular mass phthalates (di-n-butyl phthalate, butylbenzyl phthalate, di-(2-ethylhexyl) phthalate and di-n-octyl phthalate) within 30-60 min of irradiation. The rest (dimethyl phthalate and diethyl phthalate) were more recalcitrant and nearly complete removal could be achieved only after prolonged irradiation times. The relative reactivity of phthalates was explained in terms of their hydrophobicity. Experiments were carried out at an overall initial phthalate concentration of 240 microg l(-1), values of electric power of 75 and 150 W, temperatures of 21 and 50 degrees C and in the presence of NaCl to study the effect of various operating conditions on degradation. Solid-phase microextraction (SPME) coupled with GC-MS proved to be a powerful analytical tool to monitor the sonochemical degradation of phthalate esters at low microg l(-1) concentration levels, minimising the risk of secondary contamination during sample preparation, a major parameter to consider during phthalates analysis. The advantages as well as disadvantages of using SPME are also highlighted.
研究了在80kHz超声频率下对含有低浓度六种邻苯二甲酸酯的水溶液进行声化学降解的情况。结果发现，超声处理能够在辐照30 - 60分钟内去除四种较高分子量的邻苯二甲酸酯（邻苯二甲酸二正丁酯、邻苯二甲酸丁苄酯、邻苯二甲酸二（2 - 乙基己基）酯和邻苯二甲酸二正辛酯）。其余的（邻苯二甲酸二甲酯和邻苯二甲酸二乙酯）更难降解，只有经过长时间辐照才能实现近乎完全去除。邻苯二甲酸酯的相对反应活性根据其疏水性进行了解释。实验在邻苯二甲酸酯总初始浓度为240μg l⁻¹、电功率为75和150W、温度为21和50℃以及存在氯化钠的条件下进行，以研究各种操作条件对降解的影响。固相微萃取（SPME）与气相色谱 - 质谱联用被证明是一种强大的分析工具，可用于监测低μg l⁻¹浓度水平下邻苯二甲酸酯的声化学降解，将样品制备过程中的二次污染风险降至最低，这是邻苯二甲酸酯分析中需要考虑的一个主要参数。还强调了使用SPME的优点和缺点。
