A Rapid Method for Accurately Measuring Oxygen Concentrations in Milliliter Gas Samples

Open Access
Publisher Website
Google Scholar
Abstract
A method is presented for the rapid determination of O2 concentrations in which 1-ml gas samples are injected into a stream of N2 carrier gas flowing through a specific O2 sensor. Specifically, peaks were produced on a strip chart recorder within 2 sec of injecting 1-ml samples into a 15 liters·hr-1 flow of N2 through an Applied Electrochemistry Inc. Model S-3A O2 analyzer. The response to the injection of 10 O2 concentrations ranging from 0.5% to 18.9% was linear (r = 0.9996). The coefficient of variation was < 1.5% for measurements within each O2 concentration; ranging from 1.4% for concentrations 15%. This corresponded to a resolution of better than 0.4 µl O2 in a 1-ml gas sample. Other nondestructive analyzers using similar N2 carrier gas flow rates (e.g., the Horiba PIR-2000 infrared CO2 analyzer) can be attached in series to analyze for other specific gases in the same injected sample.

This publication has 0 references indexed in Scilit: