An automated continuous determination of oxygen with high sensitivity

✍ Scribed by H. Uwe Wolf; Rolf Zander; Werner Lang

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 409 KB
• Volume: 74
• Category: Article
• ISSN: 0003-2697
• DOI: 10.1016/0003-2697(76)90241-4

✦ Synopsis

A sensitive, rapid, and precise method is described for the continuous determination of oxygen in gases. The principle of the method is based on the reaction of O2 with an alkaline catechol or pyrogallol solution, which is combined with a Fe*+ solution to increase the sensitivity of the color reaction. The development of the color takes place in a tube system provided with a pro-po~ion~ng pump and is read automatically on a recorder after passing a flow cell of a photometer. The lower limit of sensitivity of this method is 0.05 ~1 of O2 min-I. Thus, in a gas flow of -0.5 ml min-I, an oxygen concentration of ~0.01% (v/v) can be determined. If the gas flow is increased to ~2.5 ml min-I, this limit of sensitivity is lowered to 20.002% (v/v). Since a 2-min period is necessary for the measurement, the volume of the sample has to be