检测易爆气体的催化发光传感器研究

Determination of Explosive Gases Utilizing Cataluminescence Sensor

报道了一种用于定量分析易爆气体混合物丙烷和异丁烷的基于碳酸锶纳米材料的催化发光传感器。基于该传感器在不同温度下对两种气体的灵敏度不同，在320℃和342℃两个工作温度下，两种气体的浓度范围均为1000mL／m^3～10000mL／m^3时，分别建立了混合组分浓度相对催化发光强度的两个线性回归方程。在342℃时，丙烷和异丁烷的检出限（3σ）分别为50mL／m^3和20mL/m^3。可通过解上述两个联立方程式求得未知混合物中两组分的浓度。外来物质甲烷、乙烷、CO、氨气通过传感器时，甲烷和乙烷分别引起5．6％和17．2％的干扰，其它气体不干扰测定。20000mL／m^3的水蒸气不干扰2000mL／m^3丙烷和异丁烷气体的测定。用该法分析了人工合成样品中两种气体的浓度。

A cataluminescence（CTL） sensor based on nanosized SrCO3 as catalyst, for quantitative analysis of the explosive gases of propane and iso-butane in a mixture was proposed. Two linear regression equations of the CTL intensity versus the gases concentration in the range of 1000～10000 mL/m^3 were established at two working temperatures of 320℃ and 342℃, as the explosive gases show different sensitivities to the sensor at different temperatures. The detection limits（3σ） of propane and iso-butane are 50, 20 mL/m^3 respectively at 342℃. The concentrations of the two components in a mixture are quantified by solving two simultaneous equations. No interference signals were observed while the foreign substances of carbon oxide and ammonia passed through the sensor. Methane and ethane caused interference around 5.6% and 17.2% respectively. 20 L/m^3 water vapor did not interfere with the determination of 2000 mL/m^3 propane and iso-butane vapors. The concentrations of the gases in two artificial samples were analyzed.