Paper is impregnated with mixture of methylene blue and ethylenediaminetetraacetic acid. Methylene blue is photo-reduced to leuco-form. Paper is kept isolated from oxygen until ready for use. Paper can be reused by photo-reduction after oxygen exposure

Whidby, J. F.

English

NASA Technical Reports Server

March 1973	 B7340103 
NASA TECH BRIEF 
Marshall Space Flight Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Oxygen Sensitive Paper 
.
The problem: 
Accurate oxygen concentration analyses are always 
performed by rather large, bulky, and expensive appa-
ratus which are not suitable for field use. Detailed 
analysis, however, is often unnecessary in applications 
that require oxygen detection or measurement of its 
approximate concentration. 
The solution: 
An oxygen sensitive paper has been developed which 
detects oxygen concentration as low as several parts 
per billion. 
How it's done: 
The paper is impregnated with a mixture of methylene 
blue and ethylenediaminctctraacetic acid which is the 
oxygen sensitive constituent. The methylene blue is 
then photo-reduced to the leuco-form. The paper is 
kept isolated from oxygen until it is ready for use. The 
paper can be reused by photo-reduction after exposure 
to oxygen.
Note: 
Requests for further information may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Code A&PS-TU 
Marshall Space Flight Center, Alabama 35812 
Reference: B73-10103 
Patent status: 
Inquiries concerning rights for the commercial use of 
this invention should be addressed to: 
Patent Counsel 
Marshall Space Flight Center 
Code A&PS-PAT 
Marshall Space Flight Center, Alabama 35812 
Source: J. F. Whidby of 
General Electric Co.
under contract to 
Marshall Space Flight Center 
(MFS-22354) 
. Category 04 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Oxygen sensitive paper

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