エブリオメーターにおける不感帯の消去
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概要
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The drain tube which is usually installed at the bottom of an ebulliometer frequently becomes a dead-space. After a solid pellet or crystals are introduced to the ebulliometer, small particles either that initially present or that result from the dissolution of larger ones often enter into this tube and remain undissolved there. If this happens, the concentration of the boiling liquid does not correspond with the weight of sample added, attainment of temperature equilibrium is delayed, and too high values for the molecular weight are obtained.<BR>We have found that this trouble can be avoided by introducing mercury into the drain tube from a rubber bulb {see Fig. 1, (a)} and confirmed that this precaution leads to more accurate results.<BR>We would therefore recommend an improved type of drain cock as illustrated in Fig. 1, (b).