Arnold D R
Environ Health Perspect. 1975 Apr;10:117-9. doi: 10.1289/ehp.7510117.
Sulfur trioxide in the exhaust gas of an internal combustion engine is removed and concentrated by absorption in a solution of 80% isopropyl alcohol, which quantitatively absorbs it and inhibits the oxidation of any sulfur dioxide which may be absorbed. The absorbed sulfur trioxide (sulfuric acid) is determined by an absorption titration by using barium chloride as the titrant and thorin as the indicator. The sulfur dioxide content of the exhaust is measured continuously by means of a DuPont Model 411 ultraviolet photoanalyzer.
内燃机废气中的三氧化硫通过被80%异丙醇溶液吸收来去除和浓缩,该溶液能定量吸收三氧化硫并抑制可能被吸收的任何二氧化硫的氧化。通过用氯化钡作为滴定剂、钍试剂作为指示剂的吸收滴定法测定被吸收的三氧化硫(硫酸)。废气中的二氧化硫含量通过杜邦411型紫外光分析仪连续测量。