ERIC Number: ED106045
Record Type: Non-Journal
Publication Date: 1968-Apr
Reference Count: N/A
The Determination of Total Nitrogen Oxides in Stack Gases. Phenoldisulfonic Acid Method.
Thorpe, Charles J. D.
The well known Saltzman method for oxides of nitrogen is intended for the determination of these constituents in the ambient atmosphere in the range of a few parts per billion to about 5ppm. However, when sulfur dioxide is present in the gas to be sampled and/or the concentration range of the oxides of nitrogen is from five to several thousand ppm, the Saltzman method is not suitable, and the method using phenoldisulfonic acid (PDS) is used as described here. This method is good for stack gases but is unsuitable for ambient atmospheric sampling. In the PDS method, grab samples are collected in evacuated flasks, absorbed in an acidic medium, and determined colorimetrically. (NTIS)
Descriptors: Air Pollution, Chemical Analysis, Chemistry, Environment, Environmental Research, Industry, Instrumentation, Measurement, Measurement Techniques, Pollution, Public Health, Technology, Waste Disposal, Wastes
National Technical Information Service, Springfield, Virginia 22151 (AD-751-888, MF $1.45, PC $3.00)
Publication Type: N/A
Education Level: N/A
Authoring Institution: Environmental Health Lab., McClellan AFB, CA.