Quantification of Hydrazines and Hydrazones,
LOCKHEED ENGINEERING AND MANAGEMENT SERVICES CO INC LAS VEGAS NV
Pagination or Media Count:
Nanomole quantities of hydrazine Hz, monomethylhydrazine MMH, and unsymmetrical dimethylhydrazine UDMH can be determined by constant-current coulometry. The hydrazines are titrated in an acidic solution with electrically-generated bromine or chlorine. No standard is required. This technique is applicable to hydrazines in gaseous, liquid, and solid samples which do not contain other bromine- or chlorine-reactive materials. The hydrazines cannot be separated by this method and it is intended to be used instead of colorimetric and other non-specific techniques. Formaldehyde hydrazones can be determined in microgram quantities by reacting the sample with chromotropic acid in a hot, strongly acidic solution. Hydrazone concentrations are determined by comparing the photometric absorbance of the samples at 570 nanometers to absorbances of paraformaldehyde standards. The technique can be used with gaseous, liquid, and solid samples. Different formaldehyde hydrazones cannot be distinguished by this technique.