Rapid Volume and Concentration Calculations in Industrial Air Analysis. Slide Rule Technique

Abstract

rPHE wet-test meter is generally used for measuring large sample volumes in analysis of industrial air. The volume of a gas indicated by such a test meter under sampling conditions of temperature and pressure is not truly representative of the quantity of matter present and, for comparison with succeeding measurements, must be adjusted to an arbitrarily defined standard temperature and pressure. These standards vary among laboratories, but standard temperature is generally in the range of 20°to 30°C. and standard pressure is usually 760 mm. of mercury on a dry basis.An equation combining the laws of Charles and Boyle is generally used for this correction, but it contains four variables and may not be put too readily or compactly into table form. Barr (1) has proposed a nomogram for reducing gas volumes to normal temperature and pressure, while Patton (3) has proposed a chart for reducing volumes to standard temperature and pressure. Roof (4) has suggested a pair of nomograms for correcting volumes of gases over small ranges of temperature and over any range of pressure. The present paper describes a slide rule designed to correct gas volumes to 25°C. and 760 mm. of mercury pressure with accuracy sufficient for industrial control purposes.

Petroleum

“…of some substances was determined. Mullen (118) described a slide rule for correcting gas volumes in industrial air analysis. To determine butadiene in water Webber and Burks (175) stripped the sample with carbon dioxide and collected the hydrocarbon in a buret over concentrated potassium hydroxide solution.…”