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Accession Number:
ADA281249
Title:
Performance Evaluation of a Colorimetric Hydrazine Dosimeter
Descriptive Note:
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON DC
Report Date:
1994-06-16
Pagination or Media Count:
24.0
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 Lmin 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.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
