Diffusive Sampling. An Alternative Approach to Workplace Air Monitoring, Proceedings of an International Symposium, Luxembourg, 22-26 September 1986. Berlin A, Brown RH, Saunders KJ, eds., London: Royal Society of Chemistry, 1987 Jan; :190-202
A NIOSH protocol for evaluating passive monitors was described. The protocol was designed to test aspects of performance specific to diffusive sampling and aspects common to both diffusive and active sampling. It consisted of nine sets of experiments that evaluated analytical recovery, sampling rate and capacity, reverse diffusion, storage stability, the effects of analyte concentration, exposure time, face velocity, relative humidity, interferents, and monitor orientation, the effect of temperature, accuracy and precision, shelf life, and behavior in the field when used for either area or personal sampling. Interpreting the data was based on statistical tests using generally accepted criteria such as +/-25 percent accuracy and 10 percent differences at the 95 percent confidence level. The authors conclude that the protocol evaluates passive monitors over their useful operating range. It obtains a maximum amount of data from a minimum number of experiments. The protocol is not intended to be a strict pass or fail evaluation but rather to serve as guidelines for users.
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