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基于纳米材料上乙醇的催化发光现象,建立了直接测定空气中乙醇浓度的方法.实验发现,乙醇在纳米级钛锆镧(原子比为5∶2∶1)复合氧化物表面有较高的发光强度和较好的选择性,以此为敏感材料可以建立一种高效稳定的乙醇气体传感器,其最佳操作条件为:分析波长620nm,测定温度310℃,载气流速130mL/min.方法的检测限为(3σ)1.3mg/m3,线性范围为2～230mg/m3,相关系数为0.9990,回收率为97.4%～102.7%.对常见共存物的研究发现,甲醛、丙酮、苯、氨、二氧化硫和二氧化碳都不干扰测定,该传感器的连续工作时间可达120h以上.
Based on the catalytic luminescence of ethanol on nanomaterials, a direct method for the determination of ethanol concentration in the air was established.It was found that ethanol had a higher luminescence on the surface of nano-sized zirconium-zirconium-lanthanum (5: 2: 1 atomic ratio) Strength and good selectivity, as a sensitive material can establish a highly efficient and stable ethanol gas sensor, the best operating conditions: analysis wavelength 620nm, the measurement temperature of 310 ° C, carrier gas flow rate of 130mL / min. (3σ) 1.3mg / m3, linear range of 2 ~ 230mg / m3, correlation coefficient of 0.9990, the recovery rate of 97.4% ~ 102.7% .The common coexistence of the study found that formaldehyde, acetone, benzene, ammonia, sulfur dioxide And carbon dioxide does not interfere with the determination of the sensor’s continuous working time up to 120h.