改装 Model 42S 化学发光氮氧化物仪测定大气中NO-NO_x-NO_y

NONO_xNO_y Measuring Using Developed Model 42SChemiluminescence NONO_x Analyzer

将美国Ｍｏｄｅｌ４２Ｓ化学发光ＮＯ－ＮＯｘ测定仪改装为ＮＯ－ＮＯｘ－ＮＯｙ同机测量．使用ＮＨ４ＮＯ３标定了不锈钢ＮＯｙ转化器．在６６０±１０℃，不锈钢转化器对ＨＮＯ３和ＮＨ３的转化效率分别为１００％和８０％—９０％．在该温度下，没有发现Ｎ２Ｏ被不锈钢转化器转化为ＮＯ．改装后仪器的分辨率、检测限、响应速率和线性度均未改变．根据对ＨＮＯ３的研究结果，该仪器的ＮＯｙ转化器带来的测量误差不大于５％．使用改装后的仪器连续测定了大气中的ＮＯ－ＮＯｘ－ＮＯｙ，得到可靠。

A Model 42S Chemiluminescence NONO_x analyzer has been developed to measure both NO_x and NO_y by the same instrument simultaneously.The efficiencies of the stainless steel converter to HNO_3 and NH_3 were reckoned as 100% and 80%-90% respectively at 660±10℃.It was not found during experiments that N_2O was converted to NO by stainless steel converter at 660±10℃.The resolving power,detecting limit,responding time and linearity of the developed instrument are not changed due to no changes in software and data processing program.The errors produced by the converter to HNO_3 is no more that 5%.NO,NO_x and NO_y in ambient air were determined continuously and reliable and reasonable data were obtained.