Sampling and analytical methods for phosphine - a review.
Am Ind Hyg Assoc J 1978 Jun; 39(6):431-437
A review of sampling and analysis methods for phosphine (7803512) with an emphasis on industrial hygiene is presented. Sampling methods using impregnated paper and filters; bubblers and midget impingers; detector tubes with solid sorbents and coated impregnated sorbents; evacuated cylinders and air sampling bags; and continuous monitors are reviewed, along with the analytic methods of gas chromatography; gas chromatography and mass spectrometry; chromogenic and colorimetric spectrophotometry; and conductimetric and potentiometric techniques. The author concludes that the most reliable method is silver nitrate impregnated filter paper sampling followed by colorimetric analysis of the silver sulfide suspension. These methods offer an immediate chromogenic indication of phosphine. A recently developed mercuric cyanide on silica gel sampling method allows quantitation of 0.02 milligrams per cubic meter (mg/cu m) to 1.64mg/cu m. This method is coupled with flame photometric gas chromatography analysis that is sensitive to 50 picograms. The solid sorbent material is not available commercially, and it must be prepared by industrial hygienists or their staffs. The author suggests that further developments in the solid sorbent will increase sampling versatility and reliability.
NIOSH-Author; Analytical-methods; Fumigants; Chemical-exposure; Exposure-limits; Industrial-poisons; Sampling-methods; Industrial-hygiene
American Industrial Hygiene Association Journal