甲醛法测定环境空气中二氧化硫的验证及探讨  

Verification and discussion on determination of SO2 in ambient air by formaldehyde method

作　　者：鲁海妍 谢海东[1] 张珊珊 孔晓彦 何媛媛 Lu Haiyan;Xie Haidong;Zhang Shanshan;Kong Xiaoyan;He Yuanyuan(Application and testing center of geology and mineral resources of Qinghai province,Xining,Qinghai,810000,China)

机构地区：[1]青海省地质矿产测试应用中心,青海西宁810000

出　　处：《化工矿产地质》2020年第4期356-360,共5页Geology of Chemical Minerals

基　　金：青海省重点研发与转化计划(2019-SF-139)。

摘　　要：二氧化硫的分析方法有碘量法、定电位电解法、自动滴定碘量法、非分散红外吸收法、紫外吸收法、甲醛吸收-盐酸副玫瑰苯胺分光光度法(简称甲醛法)等。由于甲醛法方法灵敏,适用于低浓度二氧化硫的测定而多被采用。本文通过实验,确定了方法的检出限及检测下限;通过标准物质分析及加标回收试验,方法的准确度和精密度均可满足分析要求。同时,在室温20℃显色,探讨了不同显色时间对标准曲线斜率的影响。The analytical methods of sulfur dioxide include Iodometry,Fixed potential electrolysis method,Automatic titration iodometry,Non-dispersive infrared absorption method,Ultraviolet absorption spectrophotometry,Formaldehyde absorption-pararosaniline hydrochloride(Formaldehyde method)and so on.Because of the sensitivity of Formaldehyde method,it is suitable for the determination of low concentration SO2.In this paper,the detection limit and lower limit of the method were determined by experiments,and the accuracy and precision of the method could meet the requirements of analysis by standard material analysis and spike-and-recovery test.At the same time,the effect of different color rendering time on the slope of the standard curve was discussed at 20℃room temperature.

关 键 词：甲醛法 空气 二氧化硫 验证 探讨 

分 类 号：TQ125.13[化学工程—无机化工] X511[环境科学与工程—环境工程]