JP4292661B2 - Water quality analyzer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water quality analyzer for measuring contained chemical substances related to water quality such as TOC (organic carbon) and TN (total nitrogen) contained in sample water such as sewage, river water, or factory effluent.
[0002]
[Prior art]
Sample water collected from sewage, river water, factory effluent, etc. contains many kinds of compound substances such as organic carbon, nitrogen, phosphorus, etc., which are dissolved, precipitated, or suspended in the sample water, that is, insoluble. It exists in a uniform distribution. Conventionally, when measuring sample water containing a suspension, the sample water is once transferred to a container such as another ultrasonic crusher or crusher, and the suspension is crushed and stirred for a certain period of time. The sample water is sucked with a syringe pump and injected into the measuring section.
[0003]
[Problems to be solved by the invention]
Conventional water quality analyzers are configured as described above, but when crushing suspensions in sample water using an ultrasonic crushing device or crushing device, the sample water must be transferred to those containers once. Since a large amount of sample water has to be handled compared to the normal sample amount, there is a problem that it takes time and effort to crush the suspension. In addition, if sample water that has been crushed outside the water quality analyzer is collected with a syringe pump, the suspension will re-precipitate or re-condense inside the syringe, and measurement will be performed each time it is injected multiple times. There is a problem that the values vary.
The present invention has been made in view of such circumstances, and provides a water quality analyzer that does not require the effort to equalize the distribution of the suspension in the sample water and that does not cause variations in measured values. Objective.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the water quality analyzer of the present invention is a water quality analyzer for measuring a specific chemical substance in a sample water by injecting the sample water sucked into the syringe pump into the measurement unit. The ultrasonic wave generating vibrator is fixed to the plunger part, and the ultrasonic wave generating vibrator is provided with a power source for applying a driving power from the outside. By applying ultrasonic vibration to the sample water in the syringe pump, the suspension in the sample water is suspended. The turbid matter is crushed and stirred so that the distribution of chemical substances contained in the sample water can be made uniform.
The water quality analyzer of the present invention is configured as described above, and since the suspension can be crushed and stirred in the syringe pump that sucked the sample water, the contained chemical substances can be uniformly distributed in a short time. Can do.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a water quality analyzer capable of measuring the total carbon concentration, IC carbon concentration, and organic carbon concentration in sample water will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a water quality analyzer of the present invention. In the figure, a syringe pump 1 includes a plunger 1b that sucks sample water 8 and the like in a sample container 7 and a syringe 1a that holds the sucked sample water 8, and is connected to a common port 2a of the multiport valve 2. Yes. An electrostrictive vibrator 3 as an ultrasonic wave generating vibrator is fixed to the distal end portion of the plunger 1b, and an excitation power source 6 is connected through a lead wire 4 and a switch 5. When the excitation power supply 6 is applied, the electrostrictive vibrator 3 emits ultrasonic waves into the sample water 8, crushes and stirs the suspension contained in the sample water, and contains the chemical substances contained in the sample water 8. Uniform distribution.
[0006]
The multi-port valve 2 has one common port 2a and a plurality of distribution ports 2b to 2e, and switches between the common port 2a and the distribution ports 2b to 2e as appropriate. A sample container 7 is connected to the distribution port 2b via a connecting pipe 9, and sample water 8 is sucked into the syringe 1a from this port 2b. An IC reactor 13 is connected to the distribution port 2c via the connecting pipe 10, and the sample water 8 in the syringe 1a is injected into the IC reactor 13. Further, a TC combustion furnace 14 is connected to the distribution port 2d through a connection pipe 11, and the sample water 8 in the syringe 1a is injected into the TC combustion furnace 14. A drain discharge pipe 12 is connected to the distribution port 2e, and unnecessary residues in the syringe 1a are appropriately discharged through the drain discharge pipe 12.
[0007]
IC (inorganic) carbon contained in the sample water 8 injected into the IC reactor 13 reacts with the IC reaction solution 13a to be converted into carbon dioxide, and is then sent to the infrared gas analyzer 15 for IC. Measured as carbon concentration. The sample water 8 injected into the TC combustion furnace 14 is combusted in the combustion tube 14a by the heater 14b together with a carrier gas (not shown), and all the carbon in the sample water 8 is converted into carbon dioxide, and then the infrared ray. It is sent to the gas analyzer 15 and measured as the total carbon concentration.
The organic carbon concentration is obtained by subtracting the IC carbon concentration from the total carbon concentration in the infrared gas analyzer 15.
[0008]
FIG. 2 is an explanatory view of the operation of the syringe pump 1 having means for crushing and stirring the suspension in the sample water, which is a feature of the present invention. In a state where the sample water 8 is sucked into the syringe 1 a, the electrostrictive vibrator 3 is immersed in the sample water 8. In this state, when the switch 5 is turned on and a high-frequency voltage is applied from the excitation power source 6 between the electrodes 3a and 3b of the electrostrictive vibrator 3, the electrostrictive vibrator 3 expands and contracts in the direction opposite to the electrodes 3a and 3b. Vibration waves are generated. As indicated by the arrows in FIG. 2, this ultrasonic vibration wave propagates from below to above the sample water 8, and the sample water 8 is pushed upward from below the syringe 1a to reach the surface of the sample water. 8 is a stirring action that moves downward along the side wall of the syringe 1a, and a crushing action of the suspension due to an ultrasonic vibration wave and cavitation (cavity) generated by the vibration. Are dispersed and the distribution is made uniform.
In FIG. 1, the control of the motor 16 for driving the multiport valve 2, the motor 17 for driving the plunger 1b, and the switch 5 for driving the electrostrictive vibrator 3 is shown in FIG. Made by.
[0009]
Next, the operation of the water quality analyzer of the present invention will be described based on FIG. 1 and the flowchart of FIG. 4 showing the operation of the control means 18. First, the motor 16 is driven to connect the common port 2a of the multi-port valve 2 to the distribution port 2b, and then the motor 17 is driven to pull down the plunger 1b so that a certain amount of sample water 8 is put into the syringe 1a. (S1). After the sample water 8 is sucked into the syringe 1a, the switch 5 is turned on, a high frequency voltage is applied from the excitation power source 6 to the electrostrictive vibrator 3, and ultrasonic waves are emitted to the contents including the suspension, Crush and stir (S2).
[0010]
Subsequently, after driving the motor 16 to connect the common port 2a of the multiport valve 2 to the distribution port 2d, the motor 17 is driven to pull up the plunger 1b, and the sample water 8 is injected into the TC combustion furnace 14 for combustion. Then, all the carbon is converted into carbon dioxide (S3). The total carbon concentration is measured by sending this carbon dioxide to the infrared gas analyzer and measuring it (S4).
Further, a predetermined amount of sample water 8 is sucked into the syringe 1a by the same procedure as (S1) (S5). After the sample water 8 is sucked into the syringe 1a, the sample water 8 is crushed and stirred by the same procedure as (S2) (S6).
[0011]
Then, the motor 16 is driven to switch the common port 2a of the multi-port valve 2 to the distribution port 2c, and then the motor 17 is driven to pull up the plunger 1b to inject the sample water 8 into the IC reactor 13 for the IC reaction. When reacted with the liquid 13a, IC carbon is converted to carbon dioxide (S7). IC carbon concentration is measured by sending this carbon dioxide to the infrared gas analyzer 15 and measuring it. The organic carbon concentration is measured by subtracting the IC carbon concentration from the total carbon concentration (S8).
[0012]
FIG. 5 shows a schematic configuration diagram of another embodiment of the water quality analyzer of the present invention. In the figure, the distribution port 2c of the multi-port valve 2 is connected to the acid solution 18 via the connection pipe 19, the distribution port 2d is connected to the infrared gas analyzer via the connection pipe 10, and the distribution port 2e is connected to the connection pipe 11. Is connected to the TC combustion furnace 14. Further, the syringe 1a is provided with a sparge port 19 and sparge gas is introduced. Other components having the same functions as those in FIG. 1 are given the same symbols.
[0013]
The IC carbon concentration is measured by the water quality analyzer of the present invention by switching the common port 2a to the distribution ports 2b and 2c, and sucking a predetermined amount of sample water 8 and acid solution 18 into the syringe 1a, respectively, from the sparge port 19 A sparge gas 19a is injected, and a high-frequency voltage is further applied to the electrostrictive vibrator 3 to generate ultrasonic waves. After converting IC carbon to carbon dioxide, the carbon dioxide is measured by the infrared gas analyzer 15. In addition to crushing and stirring the suspension of the sample water 8, the effect of promoting the conversion to carbon dioxide can be obtained, and the measurement time can be further shortened.
[0014]
The total carbon concentration is measured after switching the common port 2a to the distribution port 2b, sucking the sample water 8 into the syringe 1a, and homogenizing the distribution of chemical substances in the sample water 8 in the syringe 1a. The common port 2a is switched to the distribution port 2e, and this sample water is converted into carbon dioxide in the TC combustion furnace 14 and measured with an infrared gas analyzer.
As described above, according to the present invention, the sample water containing the suspension collected in the syringe 1a can be crushed and stirred by the ultrasonic vibration wave, and the trouble of transferring to another container can be omitted. In addition, the distribution of the chemical substances contained in the sample water can be made uniform easily in a short time, and variations in measurement accuracy can be eliminated and high-precision measurement can be performed.
In the above embodiment, an electrostrictive vibrator is used as the ultrasonic wave generating vibrator. However, it is also possible to use a magnetostrictive vibrator by forming an exciting coil on the plunger to generate a magnetic field. .
[0015]
【The invention's effect】
The water quality analyzer of the present invention is configured as described above. Since the suspension in the sample water is crushed and agitated in the syringe of the water quality analyzer, there is no need for trouble and the crushing time is minimized. . In addition, since the suspension is crushed and stirred immediately before the measurement, the suspension is not re-precipitated or re-condensed, and the measurement value does not vary and the measurement can be performed with high accuracy.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a water quality analyzer according to an embodiment of the present invention.
FIG. 2 is an operation explanatory diagram of a syringe pump according to the present invention.
FIG. 3 is a block diagram of a control unit and a motor according to the present invention.
FIG. 4 is a flowchart showing the operation of the water quality analyzer of the present invention.
FIG. 5 is a schematic configuration diagram of a water quality analyzer according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Syringe pump 9, 10, 11, 19 ... Connection pipe 1a ... Syringe 12 ... Drain discharge pipe 1b ... Plunger 13 ... IC reactor 2 ... Multiport valve 13a ... IC reaction liquid 2a ... Common port 14 ... TC combustion furnace 2b 2c, 2d, 2e ... distribution port 3 ... electrostrictive vibrator 14a ... TC combustion tube 4 ... lead wire 14b ... heater 5 ... switch 15 ... infrared gas analyzer 6 ... excitation power source 16, 17 ... motor 7 ... sample container 18 ... Control means 8 ... Sample water

Claims (1)

In a water quality analyzer for injecting sample water sucked into a syringe pump into a measurement unit and measuring a specific chemical substance in the sample water, an ultrasonic wave generating vibrator is fixed to a plunger part of the syringe pump, and the ultrasonic wave The generator vibrator is equipped with a power source for applying a driving power from the outside, and by applying ultrasonic vibration to the sample water in the syringe pump, the suspension in the sample water is crushed and stirred, and the chemical substances contained in the sample water Water quality analyzer, characterized in that the distribution of water can be made uniform.

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