冠醚涂层压电石英晶体传感器对甲苯、二甲苯的检测研究

Determination of Toluene and Xylene using a Piezoelectric Crystal Sensor Coated with Crown Ethers

根据冠醚化合物的结构特点和主－客体分子适应原理以及选择性吸附中性分子的特性，本文首次选用冠醚作为压电晶体传感器的敏感涂层．对甲苯和二甲苯进行检测研究，显示出良好的吸附可逆性和较高的灵敏度．稳定性、重现性好，线性响应范围较宽，对石油裂解气中低分子烃类及低浓度的ＣＯ２、ＳＯ２和ＮＨ３都不产生干扰作用。

The vibrational frequency of a piezoelectric crystalwill be decreased as a gaseous pollutant is absorbedon its coat, and under the test conditions, thedecrease of frequency is propotional to theconcentration of the gas. In this paper, three of thecrown ethers were used as a coat for monitoringtoluene and xylene first, and they can selectivelyadsorb the particular gas, the concentration of thatgas can be determined quantitatively. Theabsorption-desorption is reversible process rapidly,the response sensitivity is quite good. The lowmolecular hydrocarbons do not interfere with thisdetermination.