摘要
以CrO3为氧化剂、酸性钡（Ⅱ）为吸收液，将含有SO2的气样通过连有CrO3－石英砂氧化管的采样装置，SO2被氧化为SO3后，直接被Ba（Ⅱ）标准液吸收，并生成BaSO4沉淀．将沉淀离心分离，用原子吸收法测定未沉淀的钡，间接求出SO2－4的量，最后换算成被测气样中SO2的浓度或含量．
In this paper, a new indirect approach of determination of sulfur dioxide in gas samples was presented,SO2 was oxidized and changed into SO3 by passing through an oxidation tube with CrO3 -guartz sand. Then SO3 was absorbed by Barium (Ⅱ)standard absorption solution and precipitated as Barium sulfter. After removed of Barium sulfate by centrifngation,Surplus Barium in the absorption solution was determinated by flame atomic absorption spectrometry. Therefore,sulfur dioxide in gas samples could be determinated indirectly.Determinations of sulfur dioxide in the air or gas from chimney were better and satisfactory.
出处
《湘潭大学自然科学学报》
CAS
CSCD
1997年第1期56-59,共4页
Natural Science Journal of Xiangtan University
关键词
火焰原子吸收法
测定
二氧化硫
大气
污染物
flam atomic absorption spectrometry, indirect determination sulful dioxide,barium (Ⅱ)absorption solution, chromium trioxide oxidation tube
