A passive sampling method applicable to personnel and area monitoring has been developed for the quantitation of hydrazine, monomethylhydrazine (MMH), and unsymmetrical dimethylhydrazine (UDMH) in ambient air at the part-per-billion (ppb) level. The method uses a black molded low density polyethylene badge consisting of a diffusion barrier and a citric acid collection medium. It collects samples that can be analyzed by the NIOSH colorimetric method or a coulometric titration procedure. The two millimeter thick diffusion barrier contains 144 one millimeter diameter holes and produces a collection rate for MMH of approximately 27 ml/min. The accuracy of data collected with this badge is within 30% of actual values. The dosimeter has demonstrated accuracy for sampling periods of 15 minutes to 66 hours, when sampling MMH at the threshold limit value (TLV) concentration of 200 ppb. The limits of detection are dictated by the specific analytical method. Coulometric titration will detect exposures of 30 ppb-hours. An evaluation of the effects of face velocity, relative humidity, and potential interferences was conducted. (jes).

A passive sample-dosimeter has been developed for evaluating part-per billion (ppb) levels of hydrazine and monomethyl hydrazine (MMH) in ambient air. It is designed for quantitative documentation of personnel exposures as well as ambient atmosphere concentration. It has undergone extensive laboratory and field evaluations. The laboratory tests are reviewed in this report. Tests were conducted in controlled atmospheres to evaluate the following performance parameters: collection rate, face velocity, relative humidity effects, sample stability, reproducibility, linearity, and interference effects of selected chemical vapors. Field tests were conducted to evaluate performance under typical anticipated conditions. The test locations were selected to provide information on the probable interferents. A double-bind protocol was used which involved three groups: industrial hygienists; analytical chemists; and auditors. The data obtained from the field evaluation disclosed a performance problem not encountered in the laboratory. The cause was identified and the prototype system was modified and re-tested. The results from the modified sampler indicate that it is suitable for work place monitoring applications with two minor interferents: tobacco smoke and intense direct sunlight. Threshold Limit Value (TLV), Monomethyl hydrazine, Hydrazine, Radiobiology, Dimethylhydrazine, Dosimetry, Vapor detection, Environmental tests. (JG).

This text presents the first UK validated method for measuring hydrazine in air, which has recently been assigned a maximum exposure limit. It allows measurements to be made to demonstrate compliance with the MEL. The book is aimed at occupational hygienists and safety reps.

Recently, there has been increasing interest in environmental analysis among the scientific community. Monitoring of organic and inorganic environmental pollutants and investigations into their potential to adversely affect human health has prompted the development of new methodologies for environmental analysis. Generally, the analytical procedure is comprised of several steps, such as sample collection, sample preparation, analysis, and data processing. Sample preparation is a critical step in the development of new methodologies, and considered the main source of uncertainty in the analysis of environmental samples. In this context, several sample preparation techniques have been recently developed and optimized with aims to miniaturize extraction, automate procedures, and reduce or circumvent solvent consumption. The currently presented research focused on further development and novel applications of two sample preparation methods, solid phase microextraction (SPME) and needle trap devices (NT).