聚合物膜修饰电极QCM方法对博物馆环境中典型气态分子污染物甲醛的检测研究

Research on detection of formaldehyde,a typical gas pollutant in museum environments,using a quartz crystal microbalance

在可以导致文物、艺术品及历史档案资料品质退化的儿种环境因素中,浓度较低的气态悬浮分了污染物甲醛对文物是最具潜在破坏性影响。在光、热等物理因素的联合作用下,其形成的复合污染对文物的破坏作用更强,而就其对不同种类文物的影响的规律性研究目前尚缺少基础数据。因此,本研究采用聚苯胺膜修饰的石英晶振片电极(简称复合电极),结合石英晶体微天平(QCM)方法,对微环境中不同浓度的甲醛进行了检测研究。研究结果表明,复合电极对甲醛有较好的响应信号,复合电极频率变化值与时间基本呈线性关系,并且随甲醛浓度的升高,复合电极频率下降速度增加,频率变化值增大。研究还发现,甲醛的浓度值与频率变化值也呈现出较好的线性关系。据此可以推算文物保存环境中挥发性气态分子污染物甲醛的含量。本方法可以对文物保存环境中甲醛浓度的变化进行实时监测,为文物保存环境质量评价提供一种新的方法和依据。

Among environmental issues affecting cultural relics,art objects and documentation materials,low concentrations of the pollutant,formaldehyde,have a great potential for causing damage.In the presence of light and heat,formaldehyde may form complex substances which may cause even more damage.There is little research on the effect of formaldehyde on different categories of cultural relics.In the present study,different concentration of formaldehyde in micro - environments were tested using a quartz crystal film electrode(the composite electrode) modified with polyaniline in conjunction with a quartz crystal microbalance(QCM ).The results showed the composite electrode responds well to the formaldehyde.The frequency change of the composite electrode shows a direct relationship with time.Moreover,as the concentration of formaldehyde increases,the change in frequency of the composite electrode and the speed decreases.The study also indicates that there is a linear correlation between the concentration of formaldehyde and change in frequency of the composite electrode.Therefore,the concentration of formaldehyde could be deduced from experimental results.This method provides a means for real - time monitoring of the concentration of formaldehyde and represents way to evaluate the storage environment of cultural relics.