Chemistry: analytical and immunological testing – Nitrogen containing – Amine and quaternary ammonium
Patent
1987-05-06
1988-12-06
Richman, Barry S.
Chemistry: analytical and immunological testing
Nitrogen containing
Amine and quaternary ammonium
422 55, 422 60, 422 83, 436169, G01N 2200, G01N 148, G01N 3300, G01N 2177
Patent
active
047896388
ABSTRACT:
Process and apparatus for the detection of hydrazine and hydrazine derivatives. For the detection of hydrazine and volatile hydrazine derivatives in air, preferred is a detector tube having iodate or periodate ion in a reactor zone and an iodine sensitive colorimetric indicator in a separate indicator zone. The colorimetric indicator may be an addition-complex type indicator, a redox sensitive dye precursor or an iodination type dye precursor. The hydrazine or hydrazine derivative contacts the iodate or periodate ion in the reactor zone to form iodine which diffuses or is drawn into the indicator zone where it contacts the indicator which then undergoes a color change. In a particularly preferred embodiment of the detector tube, an oxidizing metal ion is present in the reactor zone and, when a redox sensitive indicator is employed, in the indicator zone. The oxidizing metal ion in the reactor zone reacts with excess iodide ion to prevent its reaction with iodine to form the nonvolatile triiodide ion which, if formed, precludes diffusion of iodine into the indicator portion of the detector tube. The oxidizing metal ion in the indicator zone oxidizes iodide ion, formed as a result of the reaction of iodine with a redox sensitive indicator, back to iodine. The iodine thus formed is free to react with more of the indicator, thus enhancing sensitivity.
REFERENCES:
patent: 3025142 (1962-03-01), Williams
patent: 4230457 (1980-10-01), Leichnitz
Iodometric Microdetermination of Hydrazines by Amplification Reaction, Talanta, vol. 22, pp. 757-760, 1975.
Kramer David N.
Snow Philip A.
Alexander Lyle Alfandary
Bloom Leonard
Richman Barry S.
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