中文摘要：金属有机框架氨基和氯苯氧基丙酸类除草剂羧基之间离子键的形成，导致金属有机框架可特异性且较容易吸附氯苯氧基丙酸类除草剂，但是通过洗脱机PH值的调整，氯苯氧基丙酸类除草剂又很容易从金属有机框架洗脱。本文采用分散固相微萃取方法对蔬菜样本中的氯苯氧基丙酸类除草剂性能进行评估，然后采用高效液相色谱法进行分析，并对影响萃取效率的因素进行研究和优化，然后将优化的分散微固相萃取法与高效液相色谱法相结合，建立了一个高灵敏性氯苯氧基丙酸类酸性除草剂检测方法。结果显示，所有分析物的线性范围为10-1000 pmol/mL，相关系数较满意，大于0.9985。信噪比为3的情况下，检测限为0.16-0.37 ng/g，日内和日间精密度分别为3.1%和5.9%。所有样本回收率较满意，在82.3-102%范围内。因此，合成锆基金属有机框架在复杂基质中吸附氯苯氧基丙酸类酸性除草剂方面具有一定的应用潜力。
外文摘要：The present study reports on a Zr-based metal-organic framework (MOF) with 2-amino-benzenedicarboxylic acid (UiO-66-NH2) ligand as a special and efficient adsorbent for pretreatment of chlorophenoxy acid herbicides (CPAHs) from biosamples. Owing to the ionic bond formation between the amino groups of the MOF and the carboxyl groups of CPAHs, CPAHs could be selectively and easily adsorbed by the MOF material. On the other hand, by regulation of the pH value of the eluting solvent, CPAHs could also be easily eluted from the MOF. In addition, by characterization with the techniques of scanning electron microscopy, powder X-ray diffraction, and Brunner-Emmett-Teller surface area analysis, the as-synthesized material showed good characteristics of morphology, high specific surface area and large pore volume. Its performance was evaluated by the dispersive micro-solid-phase extraction (D-m-SPE) of CPAHs from vegetable samples, followed by high-performance liquid chromatography (HPLC) analysis. The parameters affecting the extraction efficiency were investigated and properly optimized. By combining the optimized D-m-SPE conditions with HPLC, a sensitive method for the determination of CPAHs was developed. In the linearity range of 10-1000 pmol mL(-1), the correlation coefficients were satisfactory (R-2 > 0.9985) for all the analytes; the LODs were 0.16-0.37 ng g(-1) based on a signal-to-noise ratio of 3; the intra-day and inter-day precision values (based on the relative standard deviation, n = 3) were under 3.1% and 5.9%, respectively; and satisfactory recoveries for all analytes in all samples were in the range of 82.3-102%. The results demonstrate that the synthesized Zr-MOF has a potential application of adsorbing CPAHs from complex matrix.
 
外文关键词：TANDEM MASS-SPECTROMETRY; POLYCHLORINATED-BIPHENYLS; TRANSFORMATION PRODUCTS; FLUORESCENCE DETECTION; ENVIRONMENTAL-SAMPLES; CLOFIBRIC ACID; WATER; MICROEXTRACTION; STORAGE; SILICATE
作者：Xia, Lian; Liu, Lijie; Xu, Xianli; Zhu, Fenfen; Wang, Xiuli; Zhang, Keyun; Yang, Xuncheng; You, Jinmao
作者单位：Chinese Acad Sci, Northwest Plateau Inst Biol, Xining, Peoples R China.
期刊名称：NEW JOURNAL OF CHEMISTRY
期刊影响因子：3.277
出版年份：2017
出版刊次：6
点击下载：采用以锆基金属有机框架为特殊吸附剂的分散微固相萃取-高效液相色谱法检测氯苯氧基丙酸类酸性除草剂