催化发光法同时测定空气中的甲醛、苯和二氧化硫

发布时间：2018-04-04 14:24

  本文选题：甲醛　切入点：苯　出处：《分析化学》2017年06期

【摘要】：基于甲醛、苯和二氧化硫在纳米Ti_3Ce Y_2O_(11)上的催化发光有交叉敏感现象,在3个波长处分别确定甲醛、苯和二氧化硫浓度与催化发光信号强度的响应关系,再依据发光信号强度的叠加性特征即可获取甲醛、苯和二氧化硫的准确浓度,据此建立了同时测定空气中甲醛、苯和二氧化硫的新方法。3个分析波长分别为420、535和680 nm,敏感材料表面温度为280℃,载气流速为130 m L/min。本方法对甲醛、苯和二氧化硫的检出限(3σ)分别为0.04、0.05和0.10 mg/m3,线性范围分别为0.08~75.60 mg/m~3、0.10~101.40 mg/m~3和0.30~115.00 mg/m~3,回收率分别为96.4%~103.7%、97.8%~102.5%和97.2%~103.3%。常见共存物,如乙醛、甲苯、硫化氢、氨、甲醇、乙醇和二氧化碳等不干扰测定。连续200 h通浓度均为50 mg/m3的甲醛、苯和二氧化硫混合气体,发光强度的相对偏差≤2%,表明此纳米级复合氧化物对甲醛、苯和二氧化硫的敏感性的寿命长。本方法充分利用了交叉敏感现象,可以实现空气中甲醛、苯和二氧化硫的在线分析。
[Abstract]:Based on formaldehyde, benzene and sulfur dioxide, the catalytic luminescence on nanometer Ti_3Ce Y _ 2O _ 2 has cross-sensitivity phenomenon. The response relationship between the concentration of formaldehyde, benzene and sulfur dioxide and the intensity of catalytic luminescence signal is determined at three wavelengths, respectively.The accurate concentration of formaldehyde, benzene and sulfur dioxide can be obtained according to the superposition characteristics of luminous signal intensity. Based on this, the simultaneous determination of formaldehyde in air is established.The three analytical wavelengths of benzene and sulfur dioxide are 420535 and 680nm, respectively. The surface temperature of sensitive materials is 280 鈩，

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