紫外荧光法测定环境空气中的SO2

[目的]采用便携式紫外荧光仪测定环境空气中SO_2浓度。[方法]将紫外荧光法应用于室外监测,研究其性能,并与甲醛法用标准气体样品和环境空气监测数据进行比较。[结果]当环境空气SO_2浓度小于5μL/m3时,2种方法应采用绝对误差来评价;当环境空气SO_2浓度大于5μL/m3时,2种方法有很好的相关性,其相对误差小于10%。[结论]紫外荧光法具有检测灵敏度高、实时性强、检测范围宽和重复性好等优点,可用于测定环境空气中SO_2浓度。

Study on the Portable Ultraviolet Fluorescence Analyzer for Determining SO2 Concentration in the Ambient Air

Objective] The aim was to determine SO2 concentration in the ambient air by using portable ultraviolet fluorescence analyzer.[Meth-od] The monitoring value from the ultraviolet fluorescence and formaldehyde absorbing methods by standard gas samplings and ambient air was discussed through comparison experiment.[Result] The results showed that the two methods have obvious deviation except through the absolute error evaluation when the concentration of SO2 is less than 5μL/m2 ,while the deviation of two methods was less than 10%when the concentration of SO2 is more than 5 μL/m2.[Conclusion] Ultraviolet fluorescence method has advantages of high sensitivity,real-time,wide detection range and good repeatability,which can be used for determining SO2 concentration in the ambient air.