LONG-PATH (8-METER) GAS CELL ANALYSIS OF CORROSIVE-GASES BY FOURIER-TRANSFORM INFRARED-SPECTROSCOPY

Chlorine is an important reactant in many commercial chemical processe s, and it is also highly corrosive. Another highly corrosive raw mater ial, anhydrous hydrogen chloride, is often a byproduct in many free-ra dical processes but can be used elsewhere, particularly in the electro nics industry. To obtain maximum value from these raw materials, their purity should be monitored, Various contaminants may affect the ultim ate users, and some of these contaminants may cause problems even at t race concentrations, After reviewing some of the conventional methods for analysis of chlorine and anhydrous hydrogen chloride, this paper f ocuses on long-path process Fourier transform infrared as a useful met hod for analysis and quality control of these materials. Advantages of the technique are reviewed, including more reproducible samples, lowe r maintenance, higher analytical throughput, greater flexibility, and better quality control.