土壤样品中酞酸酯含量分析的前处理研究——提取液浓缩过程与净化的影响

PRETREATMENT OF SOIL SAMPLES FOR ANALYSIS OF PHTHALATE ESTERS THEREIN——EFFECT OF CONCENTRATION AND PURIFICATION OF THE EXTRACT

通过比较索氏提取和超声提取这两种提取土壤酞酸酯的方法,认为从提高回收率和降低背景干扰角度出发,超声提取法更合适作为土壤酞酸酯分析的前处理。针对超声提取过程中的一些操作步骤的细节做了比较研究,表明提取液不蒸干可减少酞酸酯的挥发损失,提取液过净化柱与否对GC-MS分析多数酞酸酯组分影响不大,不过净化柱处理可提高土壤酞酸酯的分析效率,但土壤中过多的色素干扰可能会影响某些组分(如邻苯二甲酸二(2-乙基)己酯)的分析结果。

PAEs （phthalate esters） pollution of farmland soils is frequently reported in China recently and has aroused wide concern among scientists due to its function of disrupting endocrine in human body and animal. Ultrasonic extraction and Soxhlet extraction of PAEs were performed from soils artificially contaminated with PAEs. Results show that the former is fitter to be used in pretreatment of the soil samples for PAEs analysis from the aspect of its higher recovery rate and lower background interference. A comparative study of its operating procedure in detail was carried out, revealing that exclusion of the process of drying the extract in the rotating evaporator eould reduce loss of the compound from volatilization, and the process of purifying the extraet did not affect much the result of GC-MS analysis of most PAEs. Instead, purification improved cffieiency of the PAEs analysis, however, too much interference from pigment might have some influence on accuracy of the analysis of some of its components, like Bis（2-ethylhexyl） phthalate （ DEHP）.