纳米材料催化化学发光法测定车间废气中的丁酮

Determination of Butanone in Workshop Air Utilizing Chemiluminescence on Nanosized Materials

基于纳米材料催化丁酮的氧化反应产生化学发光的现象 ,建立了一种丁酮的快速测定方法。实验发现 ,丁酮在纳米级MgO和Al2 O3 表面都有较强的发光现象 ,但在MgO与Al2 O3 摩尔比为 4∶1的混合物上有较好的选择性。选择了最佳实验条件 :分析波长为 4 4 0nm ;测定温度为 335℃左右 ;载气流速为 14 5mL/min ;方法的检出限为 6 .2mg/m3 ;线性范围为 2 0～ 10 0 0mg/m3 ;相关系数为 0 .9992。

A new method based on chemiluminescence generated on the surface of nanosized materials is proposed for direct determination of butanone in air. The selectivity for the determination of butanone in air on nanosized Mg 2AlO 7/2 is better than than on nanosized MgO or on nanosized Al 2O 3, although the chemiluminescent intensity is stronger on MgO and Al 2O 3 than than on Mg 2AlO 7/2. The optimum experimental conditions were tested. Selective determination can be achieved at the wavelength of 440 nm. The surface temperature of nanosized materials is about 335℃. The flow rate of air carrier is around 145 mL/min. The limit of detection of this method is 6.2 mg /m 3. The linear range of chemiluminescence intensity versus concentration of butanone is 20～1000 mg/m 3, and the correlation coefficient is 0.9992. The recovery of testing 10 standard samples by this method is 98.1%～100.6%. Common coexistence matters, such as toluene benzene and methanol, do not disturb the determination of butanone. This method allows rapid determination of butanone in air at workshop.