The Determination of Microgram Quantities of Monoethanol Amine and Ammonia in Air.
NAVAL RESEARCH LAB WASHINGTON D C
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A method for the simultaneous determination of ppm concentrations of ammonia and monoethanol amine MEA vapors in air has been developed. The reacting agent, diketohydrindene hydrate ninhydrin, is supported silica gel in a glass tube which also contains an ortho boric acid filter section. Equal quantities of contaminated air are passed through the tube in each direction. If NH3 andor MEA are present a blue color will develop when the tube is heated to 95-100C for two minutes following exposure. The length of the color band is proportional to the amount of contamination in the sampled air. The boric acid section of the tube removes MEA only from the stream. Hence, the color band at the filtered end of the tube represents NH3 only, and the band at the unfiltered end represents total NH3-MEA. Through appropriate calibration, MEA is determined by difference. Calibrating data are presented, as are recommended operating procedures. A versatile sampling device is also described. Author
- Organic Chemistry