Conductimetric Gas Separation-Flow Injection Determination of Ammonia in Gaseous Process Streams

1997 ◽  
Vol 62 (4) ◽  
pp. 609-619 ◽  
Author(s):  
Vlastimil Kubáň
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Hydrogen Sulfide ◽  
Sulfur Dioxide ◽  
Hydrogen Cyanide ◽  
Separation Flow ◽  
Ammonia Content ◽  
Process Gas ◽  
Capillary Membrane

Ammonia (up to 0.3 vol.%) can be determined (RSDs < 2%) after separation from a process gas stream containing (vol.%): carbon dioxide (0.3-20), hydrogen sulfide (< 0.4), hydrogen cyanide (< 1.5 . 10-4), sulfur dioxide (1), carbon monoxide (< 3) in 50-90 vol.% nitrogen and hydrocarbons. The ammonia content in sample is determined through changes in the conductivity of an acceptor stream (3 mM boric acid) caused by absorption of the analyte passed through a Nafion capillary membrane.

Qualitative Determination of Impurities in Elemental Selenium by Infrared Spectrophotometry

1969 ◽  
Vol 23 (5) ◽  
pp. 528-531 ◽  
Author(s):  
Robert A. Burley
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Sulfide ◽  
Sulfur Dioxide ◽  
Elemental Selenium ◽  
Infrared Spectrophotometry ◽  
Trace Impurities ◽  
Liquid Sulfur ◽  
Qualitative Determination ◽  
Determination Of Impurities

Infrared spectrophotometry can be applied to the detection of trace impurities and doping elements in high purity elemental selenium. The impurities examined include arsenic, sulfur, tellurium, and their oxides; chlorine, carbon dioxide, hydrogen sulfide, and selenious acid. Present results support earlier conclusions to the effect that the oxidation of impurities occurs readily in molten selenium. The band positions of sulfur dioxide dissolved in vitreous selenium show that the solution is analogous to solutions of sulfur dioxide in liquid sulfur and organic solvents.

Infrared Spectrophotometric Analysis of Medicinal Gases for Trace Impurities

1976 ◽  
Vol 59 (6) ◽  
pp. 1404-1408
Author(s):  
Wilson L Brannon ◽  
Walter R Benson ◽  
George Schwartzman
Keyword(s):  
Nitric Oxide ◽  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Hydrogen Sulfide ◽  
Sulfur Dioxide ◽  
Spectrophotometric Analysis ◽  
Gas Cell ◽  
Trace Impurities ◽  
Infrared Spectrophotometer ◽  
Low Levels

Abstract The feasibility of examining medicinal gases for trace impurities, using an infrared spectrophotometer in conjunction with a 10 m gas cell, was investigated. Many of the impurities for which the USP includes limits were detected and measured at concentrations at or below those permitted by the USP; these include sulfur dioxide, carbon dioxide, carbon monoxide, and water. However, others (hydrogen sulfide, nitric oxide, and nitrogen dioxide) were not detected at these levels by this technique. Methane was found at low levels in some samples.

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