A MODIFIED HALDANE GAS ANALYZER FOR ANALYSIS OF MIXTURES WITH ONE HUNDRED PER CENT ABSORBABLE GAS

Abstract

SUMMARY A modification of the Haldane gas analysis apparatus is de- scribed. This modification is adapted to allow analysis of samples of gas up to 16 ml. from mixtures containing up to 100 per cent of absorbable gas. This is attained by using a main burette of 16 ml. with 4 ml. graduated in 0.01 ml., and a second burette con- nected to it by a T-cock containing 12.5 ml. The latter burette may be used to store nitrogen, which can be accurately measured and be utilized to make up the volume in the main burette as gas is absorbed. The smaller burette consists of three sections with a bulb of 3.5 ml. and a graduated tube above it of 0.5 ml. Below the lowermost bulb an additional 0.5 ml. is graduated. The accuracy obtainable is of the same order as that of the ordinary Haldane apparatus. The double burette can be used not only in this way but also both burettes may be used to contain the unknown gas. Samples of gas up to 28.5 ml. in volume may thus be analyzed if the ab- sorbable gas is 57 per cent or less of the total. The accuracy ob- tainable in this form in analysis of outside air is of the order of f0.005 per cent. If desired, the main burette alone may be used exactly as an ordinary Haldane analyzer. Owing to the very variable volumes that may be utilized in the active burette, it is important to have the volume of air in the control burette adjustable. The arrangement for so doing is described, and it is pointed out that it is a useful addition to the ordinary Haldane analyzer.