JPH0127090Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a weighing bottle that can prevent substances that easily change in quality from changing in the air, accurately weigh them, and dissolve them in a sample solution.

When measuring the concentration of a specific component in a substance that is susceptible to deterioration in air, the general method is to measure the weight of the substance, then dissolve it in a sample solution, perform titration, and calculate the concentration. For example, when measuring the purity of chlorosulfonic acid, a method is carried out in which the weight of chlorosulfonic acid is measured, and then it is dissolved in a certain amount of water and titration is performed. Conventionally,
A glass pellet with a capillary tube is used as a device for weighing the substance and dissolving it in a sample solution. The method using glass spherules is only applicable when the substance is a liquid. That is, immediately after heating the glass sphere, the tip of the capillary tube is immersed in the sample, the sample is collected by suction, the tip of the capillary tube is quickly sealed, its weight is measured, and a certain amount of sample solution is poured into it. The titration is carried out after crushing in a flask. However, the method using glass spherules is troublesome in manufacturing the glass spherules and collecting samples, and is uneconomical since the glass spherules must be crushed for each measurement.

The present invention provides a weighing bottle that solves the above problems.

That is, the present invention is a weighing bottle that has a lid portion with pores through which liquid can enter, and is configured such that the apparent specific gravity when the lid is attached is greater than the specific gravity of the sample solution. The term "lid part" as used in the present invention includes not only the lid body but also the bottle container part that is in contact with the lid body.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these drawings. FIG. 1 is a perspective view showing a typical aspect of the weighing bottle of the present invention. Moreover, FIG. 2 is a perspective view showing a typical aspect of the lid 2 of the weighing bottle 1 shown in FIG. 1. One of the features of the present invention is that the lid has pores through which liquid can enter. As will be described later, the pores are for guiding the sample solution into the weighing bottle when the lid is attached to the weighing bottle and the sample solution is poured into the weighing bottle. Therefore, the size of the pores should be such that when the weighing bottle is put into the sample solution, the sample solution can enter the weighing bottle under hydraulic pressure. However, if the pore size is too large, the sample is collected in a weighing bottle,
Air tends to enter the weighing bottle during the weighing process, which may lead to deterioration of the sample. Therefore, it is preferable to determine the size of the pores by taking the above matters into consideration. Furthermore, it is necessary to provide the pores in the lid in order to safely handle the weighing bottle containing the sample. The manner in which the pores are provided in the lid is not particularly limited. Examples of preferred embodiments include a mode in which a thin groove 3 is provided on the side surface of the lid 2 as shown in FIG. It is common to have different surface roughnesses so that the inner wall of the weighing bottle body does not come into perfect contact with the inner wall of the weighing bottle body. Among the above-mentioned embodiments, in the embodiment in which thin grooves are provided on the side surface of the lid or the inner wall of the weighing bottle body with which the side surface of the lid comes into contact, the number of grooves is not particularly limited. In general, it is recommended to provide multiple grooves so that they do not face each other, because when the weighing bottle is submerged in the sample solution (described later), a pressure difference is likely to occur between each groove. It is preferable that it can be infiltrated into the inside of the body.

Another feature of the weighing bottle of the present invention is that it is constructed so that the apparent specific gravity when the lid is attached is greater than the specific gravity of the sample solution. As mentioned above, the pores provided in the lid of the weighing bottle are made as small as possible to prevent air from entering when weighing the sample, but on the other hand, they must be large enough to allow the sample solution to enter. The above configuration allows the weighing bottle to be submerged in the sample liquid, and its liquid pressure facilitates the penetration of the sample solution, thereby making it possible to make the pores smaller. The means for configuring the apparent specific gravity of the weighing bottle when the lid is attached to be larger than the specific gravity of the sample solution is not particularly limited, and the apparent specific gravity may be adjusted by appropriately determining the material, dimensions, etc. of the weighing bottle. .

Other structures of the weighing bottle of the present invention are not particularly limited.

The usage method and function of the weighing bottle of the present invention will be explained by taking as an example the case where it is used for measuring the purity of chlorosulfonic acid. First, collect a certain amount of chlorosulfonic acid into a weighing bottle, quickly cover it, and weigh it. Next, as shown in FIG. 3, the weighing bottle 1 is gently placed into a lidded flask 4 containing a certain amount of water, and the lid is closed. As soon as the weighing bottle 1 is submerged in water, water infiltrates into the weighing bottle 1 through the pores due to water pressure. When the chlorsulfonic acid comes into contact with water, the pressure inside the weighing bottle 1 rises rapidly due to the heat of dissolution, and as shown in Figure 4, the lid of the weighing bottle 1 comes off and all of the chlorsulfonic acid turns into water. dissolve. After that, flask 4
The purity of chlorosulfonic acid can be calculated by shaking the solution to uniformly dissolve the chlorosulfonic acid and titrating the aqueous solution.

As can be understood from the above explanation, the weighing bottle of the present invention is very economical because it is easy to collect and handle samples, and can be used many times. Moreover, the applicable sample is not limited to liquid, but may also be a solid sample such as powder or powder. For example, concentrated sulfuric acid,
It is suitably applied to liquid samples such as chlorosulfonic acid, and solid samples such as iron chloride, aluminum chloride, calcium chloride, and sodium hydroxide.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a typical aspect of the weighing bottle of the present invention, Fig. 2 is a perspective view showing a typical aspect of the lid, and Figs. 3 and 4 show the use of the weighing bottle of the present invention. FIG. 2 is a diagram illustrating the method. Further, in the figure, 1 indicates a weighing bottle, 2 a lid, 3 a groove, and 4 a flask.

Claims (1)

[Scope of utility model registration request] A weighing bottle having a lid having pores through which liquid can enter, and having an apparent specific gravity larger than the specific gravity of a sample solution when the lid is attached.