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Personal monitors for inorganic gases.
Louisiana State University, Baton Rouge, Louisiana, Final Progress Report 1979:24 pages
Successful passive sampling techniques were developed for ammonia (7664417) and hydrogen-cyanide (74908). For ammonia the collection of the sample required permeation through a silicone membrane into boric-acid. Spectrophotometric determination of the ammonia was carried out using Nessler's reagent or potentiometrical means with an ion selective electrode. Linearity was demonstrated using this monitor over concentration ranges of less than 10 to over 160 parts per million. The ammonia monitor was relatively free from interference by amines and could be used in a badge type monitor, as it was very light in weight and compact. It was relatively inexpensive for use as an occupational monitoring tool. The hydrogen-cyanide monitor functioned by permeation through a silicone membrane. The permeated gas was stabilized in sodium-hydroxide and determined by means of a standard pyridine/barbituric-acid colorimetric method. A detection limit of 10 parts per billion for an 8 hour exposure was obtained. Difficulties were encountered in developing a sampler for hydrogen-sulfide (7783064) because the chemical is very sensitive to changes in humidity and other environmental stresses.
NIOSH-Grant; Air-quality-monitoring; Air-sampling-equipment; Air-sampling-techniques; Monitors; Toxic-gases; Cyanides
Chemistry Louisiana State Univ A&M Coll 111 Coates Laboratories Baton Rouge, LA 70803
7664-41-7; 74-90-8; 7783-06-4
Final Grant Report
NTIS Accession No.
Louisiana State University, Baton Rouge, Louisiana, Final Progress Report
Louisiana State Univ A&M Col Baton Rouge, Baton Rouge, Louisiana
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division