Metal-organic framework-199/graphite oxide hybrid composites coated solid-phase microextraction fibers coupled with gas chromatography for determination of organochlorine pesticides from complicated samples.
Metal-organic framework-199/graphite oxide hybrid composites coated solid-phase microextraction fibers coupled with gas chromatography for determination of organochlorine pesticides from complicated samples.
复制标题
DOI：
10.1016/j.talanta.2013.04.029
复制
发表时间：
2013-10
期刊：
影响因子：
6.1
通讯作者：
Suling Zhang;Zhuo Du;Gongke Li
中科院分区：
文献类型：
--
作者：
Suling Zhang;Zhuo Du;Gongke Li
首次探索了铜基金属有机骨架（MOF-199）和氧化石墨（GO）的杂化材料作为固相微萃取（SPME）涂层。这种纤维是通过使用3-氨基丙基三乙氧基硅烷（APTES）作为交联剂，这提高了其耐久性，并允许超过140个重复提取。通过引入GO，与单独的M0 F或GO相比，GO含量在5至15重量%范围内的M0 F-199/GO纤维表现出对有机氯农药（OCPs）的增强的吸附亲和力。这种改进与由GO的致密碳层提供的增强的分散力（增加的小孔体积）有关。结合MOF的高孔隙率的上级特性和GO的独特层状特性，MOF-199/GO（10重量%）纤维表现出比商业聚二甲基硅氧烷（PDMS）和聚二甲基硅氧烷/二乙烯基苯（PDMS/DVB）纤维更高的对一些OCP的吸附亲和力。这种新型的光纤被开发用于顶空（HS）SPME的八个OCPs，然后进行GC/ECD分析。方法的检出限为2.3-6.9 ng/L。使用一根纤维进行五次重复浸提的相对标准偏差（RSD）范围为5.3%至8.8%。纤维间的重现性为5.2- 12.8%。该方法用于河水、土壤、空心菜和龙眼中8种有机氯农药的同时测定，回收率分别为90.6- 104.4%、82.7- 96.8%、72.2-107.7%和82.8- 94.3%。这些结果表明，M0 F-199/G 0复合物在样品预处理中提供了有希望的替代方案。
The hybrid material of a copper-based metal-organic framework (MOF-199) and graphite oxide (GO) was explored as the solid-phase microextraction (SPME) coating for the first time. This fiber was fabricated by using 3-amino-propyltriethoxysilane (APTES) as the cross-linking agent, which enhanced its durability and allowed more than 140 replicate extractions. With the incorporation of GO, the MOF-199/GO fibers with GO contents ranging from 5 to 15 wt% exhibited enhanced adsorption affinity to organochlorine pesticides (OCPs) compared to MOF or GO individually. This improvement was linked to the enhanced dispersive forces (increased volume of small pores) that provided by the dense carbon layers of GO. Combining the superior properties of high porosity of MOFs and the unique layered character of GO, the MOF-199/GO (10 wt%) fiber exhibited higher adsorption affinity to some OCPs than commercial polydimethylsiloxane (PDMS) and polydimethylsiloxane/divinylbenzene (PDMS/DVB) fibers. This new fiber was developed for headspace (HS) SPME of eight OCPs followed by GC/ECD analysis. The limits of detection were 2.3–6.9 ng/L. The relative standard deviation (RSD) for five replicate extractions using one fiber ranged from 5.3% to 8.8%. The fiber-to-fiber reproducibility was 5.2–12.8%. This method was successfully used for simultaneous determination of eight OCPs from river water, soil, water convolvulus and longan with satisfactory recoveries of 90.6–104.4%, 82.7–96.8%, 72.2–107.7% and 82.8–94.3%, respectively. These results indicated the MOF-199/GO composite provided a promising alternative in sample pretreatment.