便携式紫外吸收法测定多种固定源废气中的SO_(2)

The Determination of SO,in Exhaust Gas of Various Stationary Sources by Portable Ultraviolet Absorption Method

固定源废气中二氧化硫测定常受到一氧化碳、含湿量等因子影响。本文采用非分散红外吸收法和便携式紫外吸收法对4种典型固定源开展比对测试,考察两种方法在不同干扰物存在情况下的准确性。结果表明,对于低浓度二氧化硫排放源,在一氧化碳和含湿量不高的情况下,两种方法监测结果均与在线监测基本一致。对于高浓度一氧化碳排放源,便携式紫外吸收法测定二氧化硫相对误差更小,相对误差范围为-7.3%~2.9%;非分散红外吸收法相对误差达到0.5%~22.7%。对于高含湿量排放源,便携式紫外吸收法测定二氧化硫相对误差范围为-18.6%~16.0%;非分散红外吸收法相对误差达到7.7%~56%。便携式紫外吸收法具有抗干扰能力强、检出限低和仪器预热时间短的优势,更适用于生态环境监管部门执法监测。

The determination of SO,in the exhaust gas of fixed source is often disturbed by CO and moisture content.In this paper,non-dispersive infrared absorption method and portable ultraviolet absorption method were used to compare and test 4 typical Stationary sources to investigate the accuracy of the two methods in the presence of different interferences.The results showed that for low concentration of sulfur dioxide emission sources,the monitoring results of the two methods are basically consistent with on-line monitoring under the conditions of low carbon monoxide and moisture content.For high concentration carbon monoxide emission sources,the relative error of sulfur dioxide determination by portable ultraviolet absorption method is smaller,and the relative error range is-7.3%~2.9%.The relative error of the non-dispersive infrared absorption method is 0.5%~22.7%.For the emission source with high moisture content,the relative error range of SO,determination by portable ul-traviolet absorption method is-18.6%~16.0%.The relative error of the non-dispersive infrared absorption method is 7.7%~56%.The portable ultraviolet absorption method has the advantages of strong anti-interference ability,low detection limit and short instrument preheating time.It is more suitable for the execution of environmental protection and environmental monitoring in ecological environment supervision departments.