초록 ▼

Disclosed is a method and apparatus for detecting hydrazine, monomethylhydrazine (MMH), and unsymmetrical dimethylhydrazine (UDMH) in a gaseous sample. The hydrazine compound detector includes a sample converter wherein vapors of an aldehyde such as acetaldehyde or a ketone such as acetone are mixed

Disclosed is a method and apparatus for detecting hydrazine, monomethylhydrazine (MMH), and unsymmetrical dimethylhydrazine (UDMH) in a gaseous sample. The hydrazine compound detector includes a sample converter wherein vapors of an aldehyde such as acetaldehyde or a ketone such as acetone are mixed with a sample in gaseous form, and the mixture is allowed to react to form azine and hydrazone derivatives of the aldehyde or ketone. The derivatives may be transported long distances and then analyzed, as by heating in the presence of an oxidant in a pyrolyzer containing a nickel surface to produce nitric oxide (NO), followed by measurement of the NO in a NO detector such as a chemiluminescent analyzer.

대표청구항 ▼

A method of detecting the presence of hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in a gaseous sample, essentially in real time, comprising in the order given the steps of: (a) contacting a gaseous sample with aldehyde or ketone vapors to convert hydrazine, monomethylhydrazin

A method of detecting the presence of hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in a gaseous sample, essentially in real time, comprising in the order given the steps of: (a) contacting a gaseous sample with aldehyde or ketone vapors to convert hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in said sample to hydrazine derivatives; (b) heating said sample in the presence of an oxidant to decompose derivatives produced in steps (a) to produce nitric oxide gas; and (c) determining the amount of nitric oxide gas produced in step (b), wherein any nitric oxide gas determined is indicative of the presence of hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine in said gaseous sample.