초록 ▼

Dilute standard gases are prepared by utilizing a buffered solution of a compound capable of generating a desired gas. The pH of the solution adjusted so as to provide a solution with a desired specific vapor pressure of said gas and said gas is absorbed by a flow of air passed through the vapor pha

Dilute standard gases are prepared by utilizing a buffered solution of a compound capable of generating a desired gas. The pH of the solution adjusted so as to provide a solution with a desired specific vapor pressure of said gas and said gas is absorbed by a flow of air passed through the vapor phase above the solution. An apparatus for the performance of said process is also provided.

대표청구항 ▼

A method for generating a dilute standard gas selected from the group consisting of nitrogen oxides, sulfur oxides, hydrogen sulfide, hydrogen cyanide and formaldehyde at a substantially constant rate which comprises: (a) preparing a solution containing a compound capable of generating said gas; (b)

A method for generating a dilute standard gas selected from the group consisting of nitrogen oxides, sulfur oxides, hydrogen sulfide, hydrogen cyanide and formaldehyde at a substantially constant rate which comprises: (a) preparing a solution containing a compound capable of generating said gas; (b) adjusting the pH of said solution with a buffer, in a gas generating chamber having gas introduction and exit tubes disposed above said solution, to generate gas into the vapor phase above said solution; (c) passing a flow of air into said gas generating chamber through said gas introduction tube and removing dilute standard gas through said exit tube, said gas generating chamber being maintained at a substantially constant temperature throughout said gas generation, whereby said gas is generated at a substantially constant rate and is taken up by said flow of air at a substantially constant rate.