SAMPLING OF ODOUROUS AIR FOR OLFACTOMETRIC MEASUREMENT J. HARTUNG Institute for Animal Hygiene of the Hannover School of Veterinary Medicine, Blinteweg 17 p , 3000 Hannover 71, FRG Summary Both static and dynamic sampling procedures are used for olfactometric measurements. Care must be taken inorder to obtain a representative sample and to minimize sample losses due to condensation, adsorption and permeation, when using static sampling methods, particularly. Teflon or Tedlar bags and inert tubing materials help to diminish adsorption and desorption problems. Condensation can be avoided by heating the sampling tubes or by prediluting the sample with pure, odour-free air. Within the EEC guide lines exist for odour measurement in The Netherlands, France, Germany and the United Kingdom. The usefulness of dynamic sampling is agreed on. The opinions differ as far as static sampling is concerned. It seems that both sam pling methods can be applied successfully for olfactomet-ric measurements. However, it is necessary to define the details of the procedures aiming at a standardization of sampling which might be the first step for a harmoni zation of olfactometric measurements in the laboratories of the different countries. 1 . INTRODUCTION The method of measuring odour sensorily in general can be devided into the following basic steps (1): - sample collection - sample dilution and presentation - indication of response - interpretation of response Due to the fact that many different testing procedures exist in the different laboratories, results can only be com pared when knowing exactly - the conditions and procedures for sampling of the air to be i nvesti gated, - the design and function of the olfactonnetric apparatus, and - the physiological and physical status of the panel. The olfactometric apparatus and the panel are in close connection with each other as shown in Table I whereas the sam pling procedure is more or less apart from the apparatus and the panel and affects the olfactometric inlet, only. However, sample collection is the first step and can influence the re sults considerably; thus, valid sampling is the base for valid
Keyword(s):
Free Air
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