Accession Number : ADA281249

Title :   Performance Evaluation of a Colorimetric Hydrazine Dosimeter

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Brenner, Karen P. ; Rose-Pehrsson, Susan L.

PDF Url : ADA281249

Report Date : 16 JUN 1994

Pagination or Media Count : 24

Abstract : A dosimeter for real-time, colorimetric detection of hydrazine in air has been developed. The passive badge consists of a dosimeter card containing a vanillin solution coated on a thin paper substrate. The active patch consists of a thick cellulose substrate coated with a vanillin solution. When placed in a plastic sample holder attached to a personnel pump, up to 5 L/min can be drawn through the active badge substrate. Through a condensation reaction, vanillin reacts with hydrazine to form a colored product that absorbs in the visible region. The hydrazone formed in the reaction is yellow; its intensity is proportional to the dose. When exposed passively to hydrazine, the experimental detection limit is < 20 ppb-hrs. Extrapolated results indicate a detection limit of < 5 ppb-hrs for long sampling periods. Actively sampling of hydrazine vapors gives an experimental detection limit of < 100 ppb-L at a sample rate of 5 L/ min. Relative humidity effects on badge response were minor. High humidity enhanced the color development on the vanillin badge; while low humidity had no effect on badge response. Interference testing of the dosimeters revealed a tobacco smoke interference. Preliminary shelf life tests indicated no decrease in sensitivity to hydrazine when stored at room temperature for 6 months. Hydrazine, Vapor detection Dosimetry.

Descriptors :   *DETECTION, *HYDRAZINES, *VAPORS, *DOSIMETERS, *PERFORMANCE TESTS, *COLORIMETRY, *HYDRAZONES, TEST AND EVALUATION, RATES, SENSITIVITY, COATINGS, RESPONSE, SUBMARINES, LIFE TESTS, PUMPS, ABSORPTION, PERSONNEL, VISIBLE SPECTRA, INTERFERENCE, SAMPLING, COLORS, TOBACCO PLANTS, CONDENSATION REACTIONS, LOW HUMIDITY, HOLDERS, CELLULOSE, DOSIMETRY, HIGH HUMIDITY, SHELF LIFE, PLASTICS, SMOKE, ROOM TEMPERATURE, SUBSTRATES, INTENSITY, TEMPERATURE, REAL TIME, AIR

Subject Categories : Organic Chemistry
      Physical Chemistry
      Nuclear Instrumentation
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE