不同负载形式的纳米二氧化钛在水中有机磷农药痕量分析的应用

Application of Nano Titanium Dioxide with Different Loading Types in the Analysis of Trace Organophosphorus Pesticides in the Water

[目的]进一步提高检测灵敏度,实现对有机磷农药的便携、灵敏检测。[方法]考察不同负载形式的氧化钛,纳米粉体负载于玻片、溶胶凝胶合成纳米氧化钛负载于牡蛎壳制备固相萃取柱、溶胶凝胶合成纳米氧化钛负载于玻片和磁性氧化钛粒子4种装置,以甲基对硫磷和马拉硫磷2种有机磷农药为分析对象,气相色谱法分析萃取装置的富集性能。[结果]采用溶胶凝胶合成纳米氧化钛负载于玻片富集装置,效果最佳时,甲基对硫磷和马拉硫磷在水中的检测限分别为0.027、0.080μg/L。[结论]该方法前处理操作简单易行,有机试剂用量少,富集装置可重复使用,对有机磷农药检测具有便携、灵敏、环保和节省资源等优点。

[Aims] The aims were to develop rapid, highly sensitive, and easily operated methods for detection of organophosphorus pesticides （OPs） concentrations in the environment. [Methods] Four enrichment devices such as nano titanium dioxide powder loaded on the slide, solid-phase extraction column made by sol-gel synthesis of nano titanium dioxide loaded on oyster shell, sol-gel synthesis of nano titanium dioxide loaded on slide and magnetic titanium oxide particles were investigated. The organic phosphorus pesticide of methyl parathion and malathion were used as analytic target, and the enrichment performance of enrichment devices was studied using gas chromatography （G-C）. [Results] Under the optimized conditions, the limits of detection （LOD） for methyl parathion and malathion were 0.027 and 0.080 μg/L, respectively, with slide loaded with sol-gel synthesis of nano titanium dioxide. [Conclusions] The method has the advantages of simple, less organic reagent and reused enrichment devices for detection of OPs. The method is portable, sensitive, environmental protection and saving resources.