JP3284797B2 - Sample water sampling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling apparatus for collecting water in a sampling vessel for analyzing and measuring the impurity concentration contained in water (sample water) having a very low impurity concentration, such as ultrapure water for the electronics industry. About.

[0002]

2. Description of the Related Art Conventionally, sample water coming out of a faucet is directly collected in a sampling vessel, or a tube is connected to the faucet, and sample water is collected from the tube into the sampling vessel.

[0003]

As described above, when the sample water is collected directly from the faucet or from the tube to the collection container,
Since the sample water coming out of the faucet or the tube comes into contact with the air and enters the collection container in the air, impurities such as chloride ions and sodium ions in the air slightly mix into the sample water. Since the concentration of impurities originally contained in the sample water is extremely low on the order of several ppb to several ppt, the concentration of impurities mixed from the air for sampling is equal to or lower than the concentration of impurities originally contained. As a result, the accurate concentration of the impurities originally contained in the sample water cannot be measured.

[0004] In order to prevent impurities from entering the air, the sampling container is housed in a closed container filled with an inert gas containing no impurities such as nitrogen gas or argon gas.
Although sampling water is also collected in this sampling container, it is necessary to provide a facility for supplying an inert gas such as nitrogen gas or argon gas at the sampling place, which increases the cost of the equipment.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is capable of collecting a sample water into a sampling container and a water sampling container without mixing impurities in the air. The sampling container can be moved in and out of the room, and the sample water can be supplied from the outside to the collection container in the room, and the water is supplied to the water sampling room provided with a water storage portion for storing the sample water overflowing from the sampling container, and air is supplied to the water sampling chamber. An air supply device, a gas-liquid contact device provided in an air supply path to the water sampling chamber, and a lower surface communicating with a water storage portion of the water collection chamber; It is characterized by comprising a circulating device including a pump for supplying and circulating the device, and an air circulating path for circulating the air supplied to the water sampling chamber to the air supplying device. In addition, it is preferable to provide an air filter in the air supply path to the water sampling chamber in addition to the gas-liquid contact device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, reference numeral 10 denotes a water sampling chamber,
Denotes an air supply device, 30 denotes a gas-liquid contact device, 40 denotes a water circulation device, and 50 denotes an air circulation path.

[0007] The water sampling chamber 10 has a double-sided double-sided door 11,
11, the door can be opened to allow the collection container 1 to enter and exit the room. The water sampling chamber has a perforated floor plate 12 formed by a punching plate. A sampling container is placed on the bottom plate, and a water storage section 13 is provided below the floor plate 12. The upper wall of the water sampling chamber has an opening 14 for inserting the tube 2 having one end connected to a faucet provided in the flow path of ultrapure water, and the other end of the tube inserted through the opening 14 is placed on the bottom plate 12. It can be inserted to the vicinity of the bottom of the placed collection container 1. The inside diameter of the opening 14 is almost equal to the outside diameter of the tube 2, and almost no outside air enters the water sampling chamber from between.

In the embodiment shown in the drawing, a housing chamber for the demister 15 is provided on the open back of the water sampling chamber 10, a housing chamber for the gas-liquid contact device 30, a housing chamber for the air filter 60, and an air supply device 20. An air blowing chamber 22 having a built-in air blowing fan 21 is connected. The demister 15 is for removing water droplets of the air sent into the water sampling chamber 10 and is well known. The gas-liquid contact device 30 may be a known type such as a packed tower type filled with a Raschig ring, a dressing ring, a Berl saddle, or the like, a spray tower type, a wet wall type, or the like. The air filter 60 is formed by laminating a mat of glass fiber, synthetic fiber, or the like into a laminate, filter paper, or membrane, and fills the chamber.

When the blower fan 21 is operated, the blower
Air flows through the air filter 60, the gas-liquid contact device 30, and the demister 15 and enters the water sampling chamber 10, where the porous bottom plate 12
From the bottom plate and the water surface of the water storage unit 13 through the air circulation path 50 which is a space between the bottom plate and the water surface of the water storage unit 13. That is, the water storage section 13 extends from below the water sampling chamber 10 to behind the blower chamber 22 to form an air circulation path 50 on the water surface.
The air passing through 0 rises in the space 52 between the back of the blower chamber and the rear wall 51 of the device, and flows into the blower chamber from the suction port 23 in the rear wall of the blower chamber. Further, the lower surfaces of the housing chamber of the demister and the housing chamber of the gas-liquid contact device also have a porous bottom plate, and water in the room is drained to the water storage unit 13.

In order to secure the air circulation path 50, an overflow pipe 16 is provided in the water storage section 13 so that the water level does not rise above the level of the overflow pipe. The water in the water storage section is supplied to the water sprinkling pipe 31 above the gas-liquid device 30 by a water circulating device 40 including a circulating pump 41 and a circulating pipe 42.

In order to collect the sample water, the door 1 of the water sampling chamber 10 is used.
1 and 11, the collection container 1 is placed on the porous bottom plate 12, and the tube 2 that has entered the water collection chamber through the opening 14 is opened.
Is inserted into the collection container, the tip is positioned at the bottom of the container, the door is closed, and the sample water is supplied from the tube 2 into the collection container. The supply of the sample water is continued even if the sample water overflows from the mouth of the collection container, thereby washing the collection container with the sample water. The sample water overflowing from the container is the porous bottom plate 1 of the water sampling chamber.
It flows down from 2 into the water storage part 13 and accumulates. A part of the sample water may be previously stored in the water reservoir.

In this way, the supply of the sample water to the collection container is continued, the sample water is stored in the water storage section, and when the operation of the circulation pump 41 becomes possible, the circulation pump and the blower fan 21 are operated.
This operation can be automatically started by a water level gauge provided in the water storage unit. By the operation of the circulation pump, the sample water in the water storage section is supplied to the water sprinkling pipe 31 above the gas-liquid contact device 30 by the circulation pipe 42, flows downward inside the gas-liquid contact device, and is drained to the water storage section and circulated. The operation of the blower fan 21 causes the blower chamber 2
As described above, the air in 2 passes through the air filter 60, the gas-liquid contact device 30, and the demister 15, enters the water sampling chamber 10, and circulates through the circulation path 50 and the space 52 behind the blowing chamber to the blowing chamber. When the air entering the water sampling chamber passes through the air filter 60, fine particles of 0.5 μm or more contained therein are caught and removed by the air filter, and flow downward through the device when passing through the gas-liquid contact device 31. The water contains impurities that dissolve in the water or migrate to the water side for removal.
It is clean.

The sample water is supplied to the collection container in a water collection chamber to which clean air is supplied. After the sample water overflows from the container to the water storage section for about 20 to 60 minutes, the supply of the sample water, the circulation pump 41 and the blower fan 21 are performed. Stop operation of. This stop can be controlled automatically by a timer.

Next, the door of the water sampling chamber is opened, and the sampling vessel filled with sample water is capped and taken out of the water sampling chamber to complete the sampling. Then, the collection container containing the sample water is moved to a place where the analyzer is located, and is used for analysis.

The sample water in the collection container is collected in the collection container while the air purified by the air filter and the gas-liquid contact device is blown into the water collection chamber, so that the amount of impurities is small. Therefore, the extremely low impurity concentration originally contained in the sample water can be accurately analyzed and measured.

In the illustrated embodiment, the blower chamber 22, the air filter 60, the gas-liquid contact device 30, the demister 15, the water sampling chamber 1
0, but the order was changed to a gas-liquid contactor,
An air blower, an air filter, a demister, and a water sampling chamber may be arranged in this order, and air may be circulated through the air circulation path 50 to the gas-liquid contact device. Further, the air filter may be omitted.

The results obtained by supplying the sample water collected in the collection container to a positive ion chromatograph and an anion negative chromatograph and analyzing the results are as follows. Chloride ion concentration of 140 ppt and sodium ion concentration of 63 ppt when water is sampled from a faucet into a sampling container in the air. Chloride ion concentration when water is sampled from a faucet in a clean tube in the air. Was 53 ppt and the ion concentration of sodium was 38 ppt. On the other hand, when water was collected according to the illustrated embodiment, the chloride ion concentration was 3%.
The ion concentration of 0 ppt and sodium ion was 22 ppt, and each ion showed a lower value than the sampling method of, indicating that contamination from air during sampling was significantly suppressed.

[0018]

According to the present invention, sample water such as ultrapure water is
Water can be collected in the collection container while preventing contamination from the air. Therefore, the extremely low impurity concentration originally contained in the sample water can be accurately obtained, and a standard that can be used with confidence in the electronics industry, pharmaceuticals, and the like can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of a sampling device of the present invention.

FIG. 2 is a perspective view of the apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sampling container 2 Sampling tube 10 Sampling room 11 Door 12 Porous floor plate 13 Water storage part 14 Tube opening 15 Demister 20 Air blower 21 Blower fan 22 Blower room 23 Suction port 30 Gas-liquid contact device 31 Sprinkler tube 40 Water Circulation device 42 Circulation pipe 50 Air circulation path 51 Rear wall of device 52 Vertical space 60 Air filter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-5523 (JP, A) JP-A-1-231984 (JP, A) JP-A-6-130007 (JP, A) JP-A-6-60007 3229 (JP, A) Japanese Utility Model 5-59287 (JP, U) Japanese Utility Model 4-136550 (JP, U) Japanese Utility Model 2-2647 (JP, U) Japanese Utility Model 2-115168 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 1/00-1/44 G01N 33/18 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A water collection chamber having a water storage section that allows a collection container to enter and exit a room, supplies sample water from the outside to a collection container in the room, and has a water storage portion that stores the sample water overflowing from the collection container. An air supply device for supplying air to the chamber, a gas-liquid contact device provided in an air supply path to the water collection chamber, and a lower surface communicating with a water storage section of the water collection chamber; Sample water, comprising: a circulating device including a pump for supplying and circulating water to the gas-liquid supply device, and an air circulating path for circulating the air supplied to the water sampling chamber to the air supply device. Sampling equipment. 2. The sample water sampling apparatus according to claim 1, wherein an air filter is provided in addition to the gas-liquid contact device in an air supply path to the water sampling chamber. apparatus.