JPS6391544A - Method and apparatus for measuring conductivity and acid conductivity - Google Patents

Abstract

PURPOSE:To reduce a necessary amount of a liquid to be measured, by detecting the conductivity of the liquid to be measured and subsequently exchanging a cation with an H<+>-ion before detecting acid conductivity. CONSTITUTION:The mobile phase in a tank 1a flows through the route of a pump 2a the connection ports 3a, 3b of a specimen sampling valve 3 a conductivity meter 4 the inner chamber 5b of a suppressor 5 a conductivity meter 6. The scavenger liquid in a tank 1d flows through the route of pump 2b an outer chamber 5c a tank 1e and a liquid to be measured is injected from a connection port 3e to flow through the route of a connection port 3f a weighing pipe 3g a connection port 3c a connection port 3d a tank 1c to fill the weighing pipe 3g. When the sampling valve 3 is turned On, a flow passage is changed over from a solid line to a broken line and the liquid to be measured is fed to the conductivity meter 4 to detect the conductivity of the liquid to be measured. Then, the liquid to be measured is sent in the inner chamber 5b of the suppressor 5 to be contacted with the scavenger liquid in the outer chamber 5c through a cation exchange membrane tube 5a and a cation is exchanged with an H<+>-ion and acid conductivity is detected by the conduc tivity meter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides a guide for measuring liquids such as boiler cooling water.
The present invention relates to a method and apparatus for simultaneously measuring L ratio and acid conductivity.

<Prior art> In general, the water used to rotate the turbines used in thermal power generation and nuclear power generation has a conductivity of pHj.

Management is carried out by measuring various parameters such as acid conductivity and hydrazine concentration. In particular, the measurement of electrical conductivity and acid conductivity is important, and conventionally these measurements have been carried out as follows. That is, after measuring the conductivity of the liquid to be measured with the first conductivity meter, the liquid to be measured is heated to
The acid conductivity of the liquid to be measured passed through a cation exchange resin tube and eluted from between the lines was measured using a second 4-conductivity meter.Also, the liquid to be measured was divided into one system, One side is led to the first conductivity meter to measure the conductivity of the liquid to be measured, and the other is passed through H+ type cation exchange resin, and the conductivity of the liquid to be measured eluted from between the lines is measured to the second one. q as measured by a conductivity meter.The r11 conductivity is measured by passing the liquid to be measured through an H+ type cation exchange resin cylinder and exchanging the cations in the liquid with H+ ions. It refers to the electrical conductivity measured using a conductivity meter, and is sometimes called cationic conductivity.

<Problems to be Solved by the Invention> However, in the conventional example described above, it was necessary to continuously pass the liquid to be measured through the H+ type cation exchange resin in order to measure the electrical resistance. For this reason, the period during which the ion exchange resin in the H+ type cation exchange resin cylinder ceases to be an H+ cylinder is short, and there is a drawback that the ion exchange resin needs to be regenerated or replaced with a new one. .

The present invention has been made in view of the drawbacks of the conventional example, and its purpose is to minimize the amount of liquid to be measured and to eliminate the need to replace the H"l+ cation exchange strip, etc.
Another object of the present invention is to provide a method and apparatus capable of simultaneously measuring the electrical conductivity and electrical resistance of a liquid to be measured.

Means for Solving the Problems> A feature of the present invention that solves the above-mentioned problems is a method and apparatus for simultaneously measuring the electrical conductivity and hot water resistance of a liquid to be measured. The conductivity is detected, and then the cations in the liquid to be measured are exchanged with H+ ions by ion exchange using a cation exchange membrane, and then the acid tetraelectricity of the liquid to be measured is detected. be.

<Example> Hereinafter, the present invention will be explained in detail using the drawings. 1st
The figure is an explanatory diagram of the configuration of an embodiment of the present invention, in which I@ is a tank in which a mobile phase made of, for example, pure water is stored, 1d is a tank in which a scavenger liquid made of, for example, 15 mN HgSO4 is stored, Ib, lc, le are tanks for storing waste liquid,
2s and 2b are pumps that feed the mobile phase and scavenger liquid, respectively; 3 is, for example, the first to sixth connection ports 31 to 3f;
and a sampling valve 4, 6 which has a metering tube 3g having a constant internal volume (for example, a constant volume of 100 to 1000 μ2) and whose internal flow path is alternately switched between a solid line connection state and a broken line connection state; The conductivity meter 5 is divided into an inner chamber 5b and an outer chamber 5c by a cation exchange membrane tube 5K, and the scavenger liquid containing H+ ions is flowed into the outer chamber, and the conductivity meter 1 is divided into the inner chamber 5b. The suppressor 7 to which the effluent is introduced is a constant temperature bath that houses the conductivity meters 4, 6 and the suppressor 5 and keeps them at a predetermined temperature (for example, 45° C.). The conductivity of the mobile phase is usually selected to be about 1/100 of the conductivity of the liquid to be measured.
Pure water is used as the mobile phase. In the embodiment of the present invention having such a configuration, when the pump 21 is driven,
The mobile phase in the tank is pumped from the pump 2I to the first and second sampling valves 3 at a flow rate of, for example, 2 mR/zin (preferably a constant flow rate of 0.5 to 2.0 mN/win). The flow passes through the connection ports 3* and 3b → the conductivity meter 4 → the inner chamber 5b of the suppressor 5 → the conductivity meter 6, and flows in the flow path leading to the tank 1b. Further, when the pump 2b is driven, the scavenger liquid in the tank Id is, for example, 2d/win.

At the flow rate of pump 2b→outer chamber 5c of suppressor 5 =
It flows in the channel leading to Pa1e. Further, the liquid to be measured is injected from the connection port 3e of the sample sampling valve 3, flows along the path of connection hole 3f -> measuring tube 3g + connection hole 3c -> connection port 3d - + tank 1c, filling the inside of the measuring tube 3g. When the sample collection valve 3 is turned on in this state, its internal flow path is switched from the solid line connection state to the broken line connection state. Therefore, the liquid to be measured in the measuring tube 3g is conveyed to the conductivity meter 4 by the mobile phase, and its conductivity is detected. The liquid to be measured flowing out of the conductivity meter 4 is carried into the inner chamber 5b of the suppressor 5 by the mobile phase, and comes into contact with the scavenger liquid in the outer chamber 5c via the cation exchange membrane tube 51. Cations in the liquid are exchanged with H+ ions. The liquid to be measured that has flowed out from the inner chamber 5b of the suppressor 5 is transported again by the mobile phase, and the electrical conductivity of the hot water is detected by the conductivity meter 6.

2 and 3 are chromatograms drawn by guiding the detection signals of the conductivity meters 4 and 6 detected as described above to a recorder (not shown). In the figures, the horizontal axis is the time T ( The unit is minutes), and the vertical axis is the conductivity υ (units are μs/cm). Further, A is a peak b based on the detection signal of the conductivity meter 4, which indicates the conductivity of the liquid to be measured, and B is a peak based on the detection signal of the conductivity meter 6, which indicates the conductivity of the liquid to be measured. Acid conductivity is shown. In addition, Fig. 2 shows sodium chloride (LC(i) solution 0.28 meq/i as the liquid to be measured).
This is a chromatogram obtained by injecting 1ofμg,
FIG. 3 is a chromatogram when water is used as the liquid to be measured. As is clear from the chromatograms in FIGS. 2 and 3, according to the embodiment of the present invention, the conductivity and steep conductivity of the liquid to be measured can be accurately measured based on peaks A and B.

<Effects of the Invention> According to the present invention as described in detail above, the required amount of the liquid to be measured is extremely small, there is no need to replace the H+z cation column, etc., and the conductivity of the liquid to be measured and the A method and apparatus capable of simultaneously measuring acid conductivity are realized. That is, since only a sufficient amount (usually 1011 to 1008 μm) of the liquid to be measured is required to fill the measuring tube 3g of the sample sampling valve 3, the required amount of the liquid to be measured is smaller than that in the conventional example. Very few. In addition, since the scavenger liquid is constantly flowing in the outer chamber 5c of the suppressor 5 and the cation exchange membrane tube 51 is maintained in the H+ type, the regeneration operation of the H+ type cation exchange resin of the conventional example is not necessary. There is no need for replacement or replacement. Furthermore, since the conductivity meters 4 and 6 are used to measure the conductivity and acid conductivity of the same liquid to be measured, the conductivity and acid conductivity of the liquid to be measured can be measured simultaneously. In addition, the above conductivity meter 4
．． 6 can also be used in common with an ordinary conductivity meter used to measure anions and cations in a liquid to be measured.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, and FIGS. 2 and 3 are chromatograms created using the embodiment of the present invention. 1-1c...tank, 2i, 2b...pump, 3.
... Sampling valve, 4.6... Conductivity meter, 5... Suppressor, 7... Constant temperature bath. Figure 7 Figure 3 T (vLn)

Claims (2)

[Claims] (1) Collect a certain amount of the liquid to be measured, detect the conductivity of the liquid to be measured, and then exchange the cations in the liquid to H^+ ions by ion exchange using a cation exchange membrane. A method for measuring electrical conductivity and acid conductivity, characterized in that the electrical conductivity and acid conductivity of the liquid to be measured are simultaneously measured by subsequently detecting the acid conductivity of the liquid to be measured. (2) A sample collection valve that collects a certain amount of the liquid to be measured, a first conductivity meter that measures the conductivity of the liquid to be measured, and a cation exchange membrane tube that divides the interior into an inner chamber and an outer chamber. A suppressor that flows a scavenger liquid containing H^+ ions into the outer chamber and guides the effluent from the first conductivity meter to the inner chamber, and detects the conductivity of the fluid eluted from the inner chamber of the suppressor. and a second conductivity meter, and by measuring the acid conductivity of the liquid to be measured with the second conductivity meter, the conductivity and acid conductivity of the liquid to be measured are simultaneously measured. Measuring device for electrical conductivity and acid conductivity.