Wang Yuanpeng, Sun Ying, Gao Yan, Xu Bo, Wu Qiong, Zhang Hanqi, Song Daqian
College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
Talanta. 2014 Feb;119:268-75. doi: 10.1016/j.talanta.2013.11.007. Epub 2013 Nov 9.
The polyaniline-coated magnetic particles with bowl-shaped morphology (Fe3O4/C/PANI microbowls) were successfully prepared and characterized by scanning electron microscopy, transmission electron microscopy and vibrating sample magnetometry. The prepared microbowls were used as the magnetic adsorbent in dispersive solid phase extraction of five pyrethroids, including cyhalothrin, beta-cypermethrin, esfenvalerate, permethrin and bifenthrin in plain tea drinks. The effects of experiment factors, including amount of Fe3O4/C/PANI microbowls, pH value, ultrasound extraction time and desorption conditions, were investigated. The extraction recoveries obtained with 8 mg of magnetic microbowls were satisfactory, and the microbowls can be reused after easy washing. Thus, a simple, selective and effective method for the determination of the pyrethroids was established successfully. The results showed that the method had good linearity (r=0.9992-0.9998), and the limits of detections (LODs) were from 0.025 to 0.032 ng mL(-1). The intra-day and inter-day relative standard deviations (RSDs) were in the range of 2.4-6.1% and 3.5-8.8%, respectively. Recoveries obtained by analyzing the real tea drinks were in the range of 72.1-118.4%.
成功制备了具有碗状形态的聚苯胺包覆磁性颗粒（Fe3O4/C/PANI微碗），并通过扫描电子显微镜、透射电子显微镜和振动样品磁强计对其进行了表征。将制备的微碗用作磁性吸附剂，用于分散固相萃取纯茶饮料中的5种拟除虫菊酯，包括氯氟氰菊酯、高效氯氰菊酯、乙氰菊酯、氯菊酯和联苯菊酯。考察了实验因素，包括Fe3O4/C/PANI微碗用量、pH值、超声萃取时间和解吸条件的影响。使用8 mg磁性微碗获得的萃取回收率令人满意，且微碗经简单洗涤后可重复使用。因此，成功建立了一种简单、选择性好且有效的测定拟除虫菊酯的方法。结果表明，该方法具有良好的线性（r = 0.9992 - 0.9998），检测限（LOD）为0.025至0.032 ng mL(-1)。日内和日间相对标准偏差（RSD）分别在2.4 - 6.1%和3.5 - 8.8%范围内。分析实际茶饮料获得的回收率在72.1 - 118.4%范围内。
