Gromiec J, Krajewski J
Med Pr. 1977;28(6):491-7.
State methods for preparation of gas mixtures have many disadvantages. Losses of components due to adsorbtion on the container surface (glass of plastic) are the main problem. Flow--dilution dynamic systems are much more convenient, giving practically unlimited quantities of mixtures of chemical substances with air at fixed concentration. Dynamic methods enable rapid change in concentration of generated mixture and surface adsorbtion does not exist. To produce at stable rate the substance to be diluted with air, microdiffusion, motor driven syringes (or peristaltic pumps) saturated vapours, permeation tubes and pressure cylinders may be employed. Our experience showed that pressure cylinders are the best for preparation of mixtures of gases (i.e. vinyl chloride) with air and peristaltic pumps are the best as the source of vapours for further dilution. The latter method may be employed as well for mixtures of several compounds (i.e. acetic acid esters) with air.
制备气体混合物的静态方法有许多缺点。由于在容器表面（玻璃或塑料）吸附而导致的成分损失是主要问题。流动稀释动态系统则方便得多，它能以固定浓度提供实际上数量无限的化学物质与空气的混合物。动态方法能使生成混合物的浓度快速变化，且不存在表面吸附问题。为了以稳定的速率产生要用空气稀释的物质，可采用微扩散、电动注射器（或蠕动泵）、饱和蒸汽、渗透管和压力气瓶。我们的经验表明，压力气瓶最适合制备气体（如氯乙烯）与空气的混合物，而蠕动泵作为进一步稀释的蒸汽源最为理想。后一种方法也可用于几种化合物（如醋酸酯）与空气的混合物。
