ATTACHMENT FOR PREVENTING CONCENTRATION

摘要

PROBLEM TO BE SOLVED: To prevent the concentration of solution in a vessel for a long time by providing a member having an opening narrower than an opening of the vessel and a member for continuously making the surface area of liquid smaller from the vessel top to the bottom. SOLUTION: This attachment is provided with an opening for sucking liquid having an area narrower than the opening part of a vessel in a part of a member 1 for covering the opening of the vessel and a member 2 for continuously miniaturizing the surface area of the liquid from the vessel top toward the bottom. This member 2 may be integrated with the member having the opening or used by assembling another member therewith. The surface area of the liquid formed by the member 2 is a so-called tapered structure becoming wider toward the vessel top and narrower toward the bottom. For preventing this attachment from sticking to the vessel to make the inside of the vessel a negative pressure, for example, an air hole is preferably provided in a part of the attachment. This constitution can prevent the concentration of the solution irrelevant to the dimension of the vessel.