JP2506364Y2 - Antioxidant for reducing liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a reducing solution oxidation preventing device for preventing the oxidation of a reducing solution such as stannous sulphate acid chloride which easily reacts with oxygen.

[Conventional technology]

Conventionally, reducing solutions such as stannous sulphate acid chloride have been used as reagents for measuring devices for the automatic analysis of elements such as mercury. In such measurement, there is a demand to perform the measurement unattended for a long time.

[Problems to be solved by the device]

However, since the reducing liquid has a property of easily reacting with oxygen, in a normal storage state, the reducing liquid reacts with oxygen in the atmosphere to deteriorate the reducing ability of the reducing liquid. In addition, an insoluble oxide is generated in the reducing solution, and the tube for pumping the reducing solution is clogged. Therefore, there is a problem that the reducing liquid cannot be stored for a long time in a usable state, and for example, even in automatic analysis, long-term unattended operation cannot be performed.

This invention was made in view of the above conventional problems,
It is an object of the present invention to provide a reducing solution oxidation prevention device that can store a reducing solution that easily reacts with oxygen for a long period of time.

[Means for solving the problem]

In order to achieve the above object, the device of claim (1) is
It has a container filled with a reducing solution and liquid paraffin that has a lower specific gravity than the reducing solution and covers the surface of the reducing solution and shields it from the outside air, and the reducing solution contains an adsorbent that adsorbs oxygen. Has been.

According to the invention of claim (2), the flexible protective film closes the opening of the container and covers the surface of the reducing liquid to shield it from the outside air. The reducing liquid has an air vent passage for venting air from a filling space surrounded by the container and the protective film, and a valve for opening and closing the air vent passage, and the reducing liquid contains an adsorbent for adsorbing oxygen. .

[Action]

According to the invention of claim (1), the reducing liquid does not react with oxygen in the atmosphere because its surface is covered with liquid paraffin and is shielded from the outside air. Further, since oxygen in the reducing solution is adsorbed by the adsorbent, the reducing solution does not react with oxygen in the reducing solution.

According to the invention of claim (2), air is extracted from the filling space surrounded by the container and the protective film via the air vent passage, and the air vent passage is closed by the valve.
A flexible protective film covers the surface of the reducing solution. Therefore, the reducing liquid is shielded from the outside air and does not react with oxygen in the atmosphere. Further, since oxygen in the reducing solution is adsorbed by the adsorbent, the reducing solution does not react with oxygen in the reducing solution.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1 showing the first embodiment, a container 10 is filled with a reducing liquid 11 such as sulfuric acid-type stannous chloride which easily reacts with oxygen. The container 10 is made of a material having no air permeability, such as glass.

The reducing liquid 11 contains an adsorbent 12 such as porous activated carbon. The surface of the reducing liquid 11 has a smaller specific gravity than that of the reducing liquid 11 and is covered with liquid paraffin 13 that spreads in the form of a liquid film on the surface of the reducing liquid 11 and blocks outside air.

At the top of the container 10 is a tube for pumping the reducing liquid 11.
An insertion hole 15 into which 14 is inserted and an outside air introduction hole 16 that guides outside air into the container 10 are provided. Pumping end of tube 14
17 faces the reducing liquid 11.

A pump 41 for pumping the reducing liquid 11 is provided upstream of the tube 14.
Is provided. In addition, 42 is a valve.

 Next, the saving method will be described.

First, put the reducing solution 11 in the container 10, then,
The adsorbent 12 is put into 11 and then liquid paraffin 13 is poured to store the reducing liquid 11 in the state shown in FIG. The reducing liquid 11 is pumped out by the pump 41 via the tube 14. After being pumped out, the reducing solution 11 is filled with the valve 42.
It is saved in the state of being filled up.

In the above structure, in the present invention, since the surface of the reducing liquid 11 is covered with the liquid paraffin 13 and is shielded from the outside air, the reducing liquid 11 does not react with oxygen in the atmosphere. Further, since the liquid paraffin 13 does not allow air to pass through, the surface of the reducing liquid 11 can be sufficiently shielded from the outside air even if it is a thin layer. Furthermore, since the oxygen adsorbent 12 adsorbs oxygen dissolved in the reducing liquid 11, there is no possibility that the reducing liquid 11 will react with oxygen in the reducing liquid 11. Therefore, the reducing ability of the reducing liquid 11 is not deteriorated, and insoluble oxide is not generated in the reducing liquid 11, so that the tube 14 is not clogged. Therefore, the reducing liquid 11 can be stored for a long time in a usable state, and for example, in automatic analysis, long-term unmanned operation becomes possible.

For example, in the case of sulfuric acid-type stannous chloride generally used as an inorganic reducing solution, tin oxide is formed and becomes cloudy in about 2 to 3 days in the conventional storage method, whereas the storage method according to this embodiment is used. So it was possible to save it as transparent even after a month.

 FIG. 2 shows a second embodiment.

In FIG. 2, the tube 14 for pumping out is the container 10.
Pipe 18 and valve for pumping out at the bottom of the
It communicates with the reducing liquid 11 via 19. The tip end opening of the pipe 18 is covered with the strainer 20 and faces the reducing solution 11. The valve 19 is a reducing liquid.
Open only when pumping 11.

Other configurations are the same as those in the first embodiment, and the same portions or corresponding portions will be denoted by the same reference numerals and the description thereof will be omitted.

By the way, in each of the above-described examples, as the oxygen adsorbent 12, in addition to porous activated carbon, pyrogallol or the like can be used.

 FIG. 3 shows a third embodiment.

In FIG. 3, the upper opening of the container 10 is closed by a protective film 21. The protective film 21 has flexibility, and for example, a Teflon-based thin film having acid resistance and alkali resistance is used, and a material having shrinkage property is used if necessary. The protective film 21 is a gas-impermeable film that covers the surface of the reducing liquid 11 and shields it from the outside air. The protective film 21 is, for example,
The membrane holder 22 is attached to the upper end wall 10a of the container 10 in a sealed state.

The protective film 21 has a pipe for forming an air vent passage 30.
31 is installed. The air vent passage 30 is for venting air from the filling space S surrounded by the container 10 and the protective film 21 shown in FIG. 4, as will be described later, and is opened and closed by a valve 32. The pipe 31 may be attached to the upper end wall 10a of the container 10.

The other structure is the same as that of the second embodiment, and the same portions or corresponding portions will be denoted by the same reference numerals and detailed description thereof will be omitted.

 Next, the filling method will be described.

First, with the container 10 open above, the reducing solution 11
And the adsorbent 12 is put into the container 10. Then, the protective film 21 is attached by the film retainer 22 as shown in FIG.
After that, a cylinder (not shown) or the like is used to remove air from the filling space S through the air vent passage 30, and then the valve 32 is closed to prevent the inflow of air. Thus, as shown in FIG. 3, the protective film 21 having flexibility covers the surface of the reducing liquid 11. Therefore, the reducing liquid 11 is shielded from the outside air and does not react with oxygen in the atmosphere.

The protective film 21 extends as the amount of the reducing liquid 11 decreases.

[Effect of device]

As described above, according to the present invention, the surface of the reducing liquid is covered with the protective film or the liquid paraffin to shield the reducing liquid from the outside air. Therefore, oxygen in the atmosphere does not react with the reducing liquid. It can be stored for a long time without deteriorating.

In addition, since the oxygen adsorbent adsorbs the oxygen dissolved in the reducing solution, the oxygen in the reducing solution does not react with the reducing solution, so that the reducing solution can be stored for a longer period without deterioration. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing a second embodiment, FIG. 3 is a sectional view showing a third embodiment, and FIG. It is sectional drawing shown. 10 …… container, 11 …… reducing liquid, 12 …… adsorbent, 13 …… liquid paraffin, 21 …… protective film, 30 …… air vent passage, 32…
… Valve, S… filling space.

Continuation of the front page (56) Reference JP-A-59-183828 (JP, A) JP-A-55-57272 (JP, A) Actually opened 59-162932 (JP, U) Actually opened 63-99889 (JP , U)

Claims (2)

(57) [Scope of utility model registration request] 1. A container filled with a reducing solution, and a liquid paraffin that has a lower specific gravity than the reducing solution and covers the surface of the reducing solution and shields it from the outside air. Oxygen is adsorbed in the reducing solution. A reducing liquid oxidation prevention device containing an adsorbent for 2. A container filled with a reducing liquid, a protective film which is flexible and closes an opening of the container and covers the surface of the reducing liquid to shield from outside air, and the container and the protective film. An air vent passage that vents air from the enclosed filling space,
A reducing solution oxidation preventing device having a valve for opening and closing the air vent passage, and the reducing solution containing an adsorbent for adsorbing oxygen.