以Fe3O4为核心的新型磁性纳米材料,PS-DVB作为外壳层,采用种子乳液聚合法合成了C18(C18-PS-DVB-Fe3O4)表面改性产物。C18-PS-DVB-Fe3O4保留了化学稳定性的优点,大孔隙度,有机聚合物形貌均匀,具有Fe3O4的磁性。一个简单的,灵活,和高效磁性分散固相萃取(Mag-dSPE)方法提取防腐剂,甜味剂,并建立了河水中的着色剂。C18-PS-DVB-Fe3O4用作Mag-dSPE的吸附剂,并与高效液相色谱(HPLC)联用检测11种食品添加剂:安赛蜜,栀子,苯甲酸,柠檬黄,糖精钠,山梨酸,脱氢乙酸,日落黄,诱惑红,灿烂的蓝色,和赤藓红.在最佳提取条件下,结合ChromCoreTMAQC18(5μm,4.6×250mm),以20mmol/L乙酸铵水溶液和甲醇为流动相,检测波长为240nm和410nm。11种食品添加剂的检出限(LODs)为0.6-3.1μg/L,令人满意的回收率在86.53%至106.32%之间。并且该材料可以重复使用五个循环,而不会牺牲太多提取效率。该方法已用于测定河水样品中的食品添加剂。结果证明了拟议的C18-PS-DVB-Fe3O4Mag-dSPE与HPLC方法在环境监测分析中的适用性。
A novel magnetic nanomaterial with Fe3O4 as the core, PS-DVB as the shell layer, and the surface modified with C18 (C18-PS-DVB-Fe3O4) had been synthesized by seeded emulsion polymerization. C18-PS-DVB-Fe3O4 retains the advantages of the chemical stability, large porosity, and uniform morphology of organic polymers and has the magnetic properties of Fe3O4. A simple, flexible, and efficient magnetic dispersive solid phase extraction (Mag-dSPE) method for the extraction of preservatives, sweeteners, and colorants in river water was established. C18-PS-DVB-Fe3O4 was used as an adsorbent for Mag-dSPE and was coupled with high-performance liquid chromatography (HPLC) to detect 11 food additives: acesulfame, amaranth, benzoic acid, tartrazine, saccharin sodium, sorbic acid, dehydroacetic acid, sunset yellow, allura red, brilliant blue, and erythrosine. Under the optimum extraction conditions, combined with ChromCoreTMAQC18 (5 μm, 4.6 × 250 mm), 20 mmol/L ammonium acetate aqueous solution and methanol were used as mobile phases, and the detection wavelengths were 240 nm and 410 nm. The limits of detection (LODs) of 11 food additives were 0.6-3.1 μg/L with satisfactory recoveries ranging from 86.53% to 106.32%. And the material could be reused for five cycles without much sacrifice of extraction efficiency. The proposed method has been used to determine food additives in river water samples, and results demonstrate the applicability of the proposed C18-PS-DVB-Fe3O4 Mag-dSPE coupled with the HPLC method to environment monitoring analysis.