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Two types of purification devices for gases are described. The purification effect is based on the cataphoretic segregation in the positive column of a low-pressure discharge. This segregation as a function of time is given in terms of the tube current, gas pressure, and the tube dimensions. From them optimum conditions can be chosen for a high final purity and a high purification velocity. Experimental results of the segregation in a discharge in neon with an impurity of argon are given.
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J. Freudenthal (1967) studied this question.
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