JP2000121556A - Device for detecting substance dissolved in water and measuring device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost and compact device for detecting substances dissolved in water, and a measuring device superior in stability and little in measurement error, capable of measuring substances dissolved in water having absorption characteristics in 185 nm to 260 nm without using a spectral filter, a light gathering part, or a mechanism for shielding external visible light. SOLUTION: The device 1 for detecting substances dissolved in water, is provided with a sealed container 6 in which an ultraviolet receiving part 5 is formed of a light transmission regulating glass which does not transmit ultraviolet rays shorter than at least 185 nm, a cathode 7 formed of a material with a photoelectric threshold wavelength of at least 260 nm or less, a discharge gas 8 to multiply electrons discharged from the cathode 7, and an anode 9 to receive electrons multiplied by discharge gas 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissolved substance detector in water for measuring the concentration of an ultraviolet absorbing substance in water using an ultraviolet absorbance method, and a measuring device using the same.

[0002]

2. Description of the Related Art Conventionally, nitric acid, nitrous acid, chloride ion, or
As a dissolved substance detector in water for measuring the dissolved amount of a substance having a short wavelength ultraviolet absorption property such as an organic substance, a spectrophotometer using an ultraviolet absorption method is most widely used.

FIG. 5 is an overall configuration diagram of a conventional detector for dissolved substances in water. In FIG. 5, 50 is a conventional spectrophotometer,
Reference numeral 2 denotes water to be measured containing a substance having a short-wavelength ultraviolet absorption property such as nitric acid, nitrous acid, chlorine ion, or organic substance; 3, a storage container for storing the water 2 to be measured; Reference numeral 3b denotes an ultraviolet light emitting surface of the storage container 3, reference numeral 51 denotes an ultraviolet light source which emits ultraviolet light including a measurement wavelength, such as a deuterium lamp, and reference numeral 52 denotes only ultraviolet light in the measurement wavelength range of the ultraviolet light emitted from the ultraviolet light source 51. A spectral filter for transmitting light, 53 is a condensing part for condensing the ultraviolet light separated by the spectral filter 52, and 54 is a measuring light absorbed and attenuated by a substance having an ultraviolet absorbing property in the water to be measured 2 such as a photodiode. The ultraviolet light receiving portion 55 to be detected is an external visible light blocking wall that blocks external visible light.

[0004] The measurement principle of a conventional spectrophotometer will be described below. The measurement wavelength (185 n
m-260 nm), and 185 nm-260 n of the ultraviolet light emitted from the ultraviolet light source.
Only the ultraviolet light in the wavelength range of m is transmitted through the spectral filter 52. Since the ultraviolet light separated by the spectral filter 52 is dispersed, the light collecting unit 53 collects the separated ultraviolet light to a necessary light flux. The measurement light condensed by the light condensing section 53 is applied to the water to be measured 2 containing a substance such as nitric acid, nitrous acid, chlorine ion, or an organic substance. The measuring light absorbed and attenuated by the ultraviolet light incident surface 3a, the ultraviolet light emitting surface 3b, and the measured water 2 is detected by the ultraviolet light receiving unit 54. When measuring a substance having ultraviolet absorption characteristics, the transmittance of the spectrophotometer is 100% with distilled water or a standard solution having the same base as the aqueous solution to be measured.
And Next, the water to be measured 2 containing a substance having a short-wavelength ultraviolet absorption property such as nitric acid, nitrous acid, chlorine ion, or an organic substance is set in a spectrophotometer, and the transmittance of the water to be measured 2 is measured. From the transmittance value, the concentration of the substance having the above-mentioned ultraviolet absorbing property can be converted.

[0005] A photodiode having sensitivity in the ultraviolet region is used for the conventional ultraviolet light receiving section 54, and visible light such as external sunlight or room light affects the photodiode. A light blocking wall 55 is required. Further, as the ultraviolet light emitting source 51, a deuterium lamp is used because the light emission intensity in the ultraviolet region is strong and the intensity is relatively stable.

[0006]

However, using the above-mentioned conventional spectrophotometer, a dissolved substance detection in water for measuring the dissolved amount of a substance having a short wavelength ultraviolet absorbing property such as nitric acid, nitrous acid, chloride ion or organic substance. The instrument and the measuring device had the following problems.

(1) A photodiode used in a spectrophotometer is expensive and has a problem that a measurement error due to visible light is large because the sensitivity of visible light is much higher than that of ultraviolet light. .

(2) In order to avoid the influence of the visible light on the photodiode, of the irradiation light from the ultraviolet light source,
It is necessary to have a spectral filter that separates only the ultraviolet light of the measurement wavelength, a sunlight filter, and an external visible light blocking wall to prevent the external visible light from entering the ultraviolet light receiving unit such as a room light, excluding the visible light that is the measurement noise source. There has been a problem that the detector becomes expensive and the detector becomes large.

(3) Ultraviolet light shorter than 185 nm, which is not required for measurement, is easily absorbed by O ₂ molecules and the like, and changes depending on the surrounding atmosphere. Had.

(4) Of the irradiation light from the ultraviolet light emitting source,
There is a problem that a measurement error is large due to a temperature change inside the detector due to heat generated by ultraviolet rays (ultraviolet rays longer than 260 nm) not required for the measurement, and a change in the light receiving sensitivity of the ultraviolet ray receiving unit.

(5) In order to suppress a change in the light receiving sensitivity of the ultraviolet light receiving unit due to a temperature change, a method of sufficiently increasing the distance between the ultraviolet light emitting source and the ultraviolet light receiving light source and a method of providing an ultraviolet light receiving unit cooling mechanism have been adopted. However, there is a problem that the detector becomes large and expensive.

The present invention solves the above-mentioned conventional problems, and can measure dissolved substances in water without using a spectral filter, a light-collecting unit, and a structure for blocking external visible light, and has excellent stability, low cost, and small size. It is an object of the present invention to provide a dissolved substance detector in water with a small measurement error and a measuring device using the same.

[0013]

Means for Solving the Problems To achieve this object, a dissolved substance detector in water of the present invention and a measuring apparatus using the same are constituted as follows.

The detector for dissolved substances in water according to the present invention has a sealed container in which the ultraviolet ray receiving portion is formed of a transmission light regulating glass which does not transmit ultraviolet rays shorter than at least 185 nm, and a material having a photoelectric limit wavelength of at least 260 nm. It has a configuration including a cathode, a discharge gas for multiplying electrons emitted from the cathode, and an anode for receiving electrons multiplied by the discharge gas.

According to this configuration, (1) the number of the ultraviolet ray receiving portions is one;
By being arranged on the transmitted light regulating glass sealed container that does not transmit shorter UV 85 nm, can not pass through the shorter UV than 185nm which does not require the measurement, O ₂ in which O ₂ and gas or water dissolved in the ambient atmosphere It is possible to suppress a water quality detection error caused by absorbing ultraviolet rays.

(2) Since a cathode having a photoelectric limit wavelength of 260 nm or less is used, it is unnecessary for measurement.
The substance dissolved in water can be measured without responding to light of nm or more and without using an external visible light blocking structure.

(3) The spectral filter and the light condensing element are provided by disposing the ultraviolet ray receiving portion in a hermetically sealed container made of a transmissive light regulating glass which does not transmit ultraviolet rays shorter than 185 nm and using a cathode having a photoelectric limit wavelength of 260 nm or less. UV light of 185 to 260 nm can be measured without using a part.

(4) By installing the ultraviolet light emitting part and the ultraviolet light receiving part in the container for storing the water to be measured, the water to be measured serves as cooling water, and the temperature change can be suppressed and the stable ultraviolet light can be measured.

Further, the apparatus for measuring dissolved substances in water according to the present invention comprises:
The underwater dissolved substance detector according to any one of claims 1 to 4, a driving circuit that drives the ultraviolet light emitting unit, and a measurement circuit that measures a minute current flowing between the cathode and the anode. And a calculation circuit for converting a signal from the measurement circuit into a concentration, and a display unit for displaying a calculation result of the calculation circuit.

With this configuration, by using the above-described dissolved substance detector in water, the dissolved amount of a substance having a short-wavelength ultraviolet absorption property such as nitric acid, nitrous acid, chloride ion, or an organic substance in water can be measured. It is possible to provide an apparatus for measuring dissolved substances in water which is excellent in stability, small in size, low in cost, excellent in mass productivity, and has few measurement errors.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a container for storing a water to be measured containing a substance having an ultraviolet absorbing property in a short wavelength ultraviolet region (185 nm to 260 nm); An ultraviolet light emitting source for irradiating ultraviolet light including the ultraviolet light source, and an ultraviolet light receiving unit for detecting short wavelength ultraviolet light which is irradiated from the ultraviolet light emitting source and absorbed and attenuated by the substance in the water to be measured. A sealing container formed of a transparent light-controlling glass in which the ultraviolet ray receiving portion does not transmit ultraviolet rays shorter than at least 185 nm, a cathode formed of a material having a photoelectric limit wavelength of at most 260 nm, and electrons emitted from the cathode. , And an anode for receiving the electrons multiplied by the discharge gas.

Thus, (1) the ultraviolet ray receiving section is 185
by being arranged on the transmitted light regulating glass sealed container that does not transmit shorter UV nm, can not pass through the shorter UV than 185nm which does not require the measurement, O ₂ in which O ₂ and gas or water dissolved in the ambient atmosphere Can suppress water quality detection errors due to absorption of ultraviolet rays.

(2) Since a cathode having a photoelectric limit wavelength of 260 nm or less is used, it is unnecessary for measurement.
A substance dissolved in water can be measured without responding to light of nm or more and without using an external visible light blocking structure.

(3) Since the ultraviolet ray receiving section is provided in a hermetically sealed container made of transmitted light control glass which does not transmit ultraviolet rays shorter than 185 nm and a cathode having a photoelectric limit wavelength of 260 nm or less is used, a spectral filter and a light condensing element are used. UV light of 185 to 260 nm can be measured without using a part.

Here, as the transmitted light suppressing glass, UV
Glass (transmission wavelength limit: 185 nm), Vycor glass (220 nm), sapphire glass (190 nm), fused silica (185 nm), and borosilicate glass (240 nm) are used. The ultraviolet light incident surface and the ultraviolet light exit surface of the measured water storage container are formed of at least one of the above-mentioned transmitted light suppressing glasses.

The cathode has a photoelectric limit wavelength of 260 nm.
The following Ni (250 nm), Au (253 nm), Be
(240 nm), Co (249 nm), Pd (250 n
m), a simple metal such as Cu (252 nm) or Pt (225 nm) or a compound such as ZrO ₂ , MgS, CaS, or SrS. Depending on the absorption wavelength of the substance to be measured,
It is desired that the combination is properly performed. I mean,
This is because the range of wavelengths that can be detected can be limited, so that measurement accuracy is improved.

As the discharge gas, H ₂ , Ar, He, N
In addition to He-Ne single gas e and the like, a mixed gas such as Ar-N ₂ is used.

As the anode, Fe, Ni, Co, Cu,
Cr, W, Mo, C, Au, Ag, and At are used.

According to a second aspect of the present invention, in the first aspect, the ultraviolet light source is an ultraviolet lamp having an emission peak in a short wavelength ultraviolet region.

Thus, in addition to the effect obtained in claim 1, the amount of light having a wavelength longer than 260 nm, which is unnecessary for measurement, can be weakened, so that the amount of heat generated can be suppressed, and the ultraviolet light can be stably and accurately obtained without using a cooling device. Can be measured.

Here, an ultraviolet lamp capable of emitting ultraviolet light having a wavelength including short wavelength ultraviolet light (185 nm to 260 nm) is used. Any lamp that emits ultraviolet light including short-wave ultraviolet light may be used, but an ultraviolet lamp having an emission peak at a short-wave ultraviolet light region, particularly, at an absorption wavelength of a substance to be measured is desirable. The reason for this is that light having a wavelength of 260 nm or more is unnecessary for the measurement, has a high calorific value, and causes temperature fluctuation in the detector. Specific examples of the ultraviolet lamp include a cathode glow lamp and a Xe lamp.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the ultraviolet ray receiving section and / or the ultraviolet ray emitting source is disposed in the storage container for the water to be measured. have.

Thus, in addition to the effects obtained in claim 1 or 2, cooling of the ultraviolet ray receiving portion and / or the ultraviolet ray emitting source by the water to be measured can be performed, and the temperature rise in the detector can be suppressed and the ultraviolet ray can be stabilized. Can be measured.

According to a fourth aspect of the present invention, in the first to third aspects, the water to be measured is flowing water.

Thus, in addition to the effects obtained in the first to third aspects, the ultraviolet light emitting source can be efficiently cooled and the temperature in the detector can be kept constant. it can.

The invention according to claim 5 of the present invention is the invention according to claims 1 to 4, wherein the substance having an ultraviolet absorbing property in a short wavelength ultraviolet region is nitric acid, nitrous acid, hypochlorous acid, chlorine ion or , 250 nm to 260 nm.

Thus, in addition to the effects obtained in claims 1 to 4, a small-sized device capable of stably measuring nitric acid, nitrous acid, hypochlorous acid, chloride ions, or an organic substance having an absorption characteristic at 250 nm to 260 nm. The cost of the detector can be reduced.

Here, as a substance having an absorption characteristic in a short wavelength ultraviolet region, nitric acid (200 nm to 240 nm), nitrous acid (210 nm), hypochlorous acid (254 nm), chlorine ion (190 nm), and organic substances (250 nm to 260 nm) are used.
m) and the like. Each has an absorption peak in the measurement range of the short wavelength ultraviolet light of 185 nm to 260 nm.

According to a sixth aspect of the present invention, there is provided a detector for a dissolved substance in water according to any one of the first to fifth aspects, and an ultraviolet light emitting portion of the detector for the dissolved substance in water. A driving circuit, a measuring circuit for measuring a minute current flowing in the ultraviolet light receiving portion of the underwater dissolved substance detector, an arithmetic circuit for converting a signal from the measuring circuit into a concentration, and a display for displaying an arithmetic result of the arithmetic circuit. And a unit.

Thus, by using the detector for dissolved substances in water according to any one of claims 1 to 5,
It can measure the dissolved amount of nitric acid, nitrous acid, chloride ion or the substance with short wavelength ultraviolet absorption of organic matter in water, it is excellent in stability, small size, low cost, excellent in mass productivity, and measurement error It is possible to provide an apparatus for measuring a small amount of dissolved substances in water.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. (Embodiment 1) FIG. 1 is an overall configuration diagram of a detector for dissolved substances in water according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a detector for dissolved substances in water according to the first embodiment, 2 denotes water to be measured containing nitric acid, nitrous acid, chlorine ions or organic substances, and 4 denotes short-wavelength ultraviolet rays (185
ultraviolet light sources for supplying ultraviolet light including ultraviolet rays (nm to 260 nm), 4a and 4b are lead wires of the ultraviolet light source 4, 5 is an ultraviolet light receiving portion, and 6 is a transmission light regulating glass that does not transmit ultraviolet light shorter than at least 185 nm. Sealed container,
7 is a cathode having a photoelectric limit wavelength of 260 nm or less, 8 is a cathode 7
A discharge gas for multiplying the emitted electrons; 9 an anode receiving the electrons multiplied by the discharge gas 8; 10 an insulating spacer for maintaining a constant distance between the cathode 7 and the anode 9;
Reference numeral 11b denotes a lead wire of the ultraviolet light receiving unit 5. Note that the same components as those in the conventional example (FIG. 5) are denoted by the same reference numerals, and description thereof is omitted.

Next, the production of the ultraviolet ray receiving section 5 of the detector for dissolved substances in water according to the first embodiment will be described.

In order to increase the amount of ultraviolet light received in the sealed container 6 and to increase the sensitivity of the detector, a cathode 7 having an area larger than the anode 9 and a potential difference from the cathode 7 in a small area so as to efficiently receive emitted electrons. In order to make the temperature uniform, a spiral or wire mesh-shaped anode 9 is arranged, and a discharge gas 8 is introduced into a sealed container 6.

Next, the operation of the detector for dissolved substances in water according to the first embodiment will be described. Ultraviolet light including short-wavelength ultraviolet light is continuously or periodically supplied from the ultraviolet light source 4 to the measured water container 3 containing the measured water 2. The supplied ultraviolet light passes through the ultraviolet light incident surface 3a, is absorbed and attenuated by the water to be measured 2 in the absorption wavelength region of each measurement substance, passes through the ultraviolet light exit surface 3b, and reaches the ultraviolet light receiving unit 5. Then, the ultraviolet rays that have reached the ultraviolet ray receiving section 5 are cut off at least by ultraviolet rays shorter than 185 nm by the transmitted light regulating glass of the sealed container 6, enter the ultraviolet ray receiving section 5, collide with the cathode 7, and emit electrons by the photoelectric effect. I do. The emitted electrons are accelerated by a voltage applied between the cathode 7 and the anode 9 and are moved to the anode 9. When moving, it collides with the discharge gas 8 and reaches the anode 9 while causing an electron multiplication phenomenon. The concentration of nitric acid, nitrous acid, chlorine ions, organic substances, or the like in the aqueous solution can be converted from the current value generated at this time.

(Embodiment 2) FIG. 2 is a configuration diagram of a main part of a detector for dissolved substances in water according to Embodiment 2 of the present invention.

In FIG. 2, reference numeral 20 denotes a detector for dissolved substances in water according to the second embodiment, reference numeral 21 denotes a storage container for storing the water to be measured containing nitric acid, nitrous acid, chloride ions, organic substances, and the like; An inlet 23 is an outlet of the measured water 2. still,
The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, the ultraviolet light emitting part 4 and the ultraviolet light receiving part 5 are installed in the water container 21 to be measured.
The point in contact with the measured water 2 is a point greatly different from the first embodiment. The method of producing the ultraviolet light receiving unit 5 is the same as that of the first embodiment.

Next, the operation of the detector for dissolved substances in water according to the second embodiment will be described. The ultraviolet light generated by the ultraviolet light emitting unit 4 is directly irradiated on the water 2 to be measured, and is detected by the ultraviolet light receiving unit 5. At this time, the temperature rise in the detector caused by the heat generation of the ultraviolet light emitting unit 4 causes the measured water 2 to serve as cooling water. Can be suppressed. The description of the same operation as in the first embodiment is omitted.

Here, when the measured water 2 is flowing water, the cooling efficiency is improved. Embodiments 1 and 2 of the present invention
According to the method, dissolved substances in water can be measured without using a spectral filter, a light condensing part and a structure for blocking external visible light,
It is possible to provide a detector for dissolved substances in water which has excellent temperature stability, is low in cost, is small, and has little measurement error.

(Embodiment 3) FIG. 3 is a schematic diagram of an apparatus for measuring dissolved substances in water according to Embodiment 3 of the present invention.

In FIG. 3, reference numeral 30 denotes an apparatus for measuring dissolved substances in water according to the third embodiment, reference numeral 31 denotes a drive circuit of the ultraviolet light emitting section 4,
32 is a measuring circuit for measuring and amplifying a small current generated between the cathode 7 and the anode 9 of the ultraviolet light receiving section 5, and 33 is a measuring circuit 3
An operation circuit for converting the signal from 2 into a density is a display unit 34 for displaying the operation result of the operation circuit 33. Note that the arithmetic circuit 33 and the like can be configured by software using a microcomputer or the like.
Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of the apparatus for measuring dissolved substances in water according to the third embodiment will be described. When a voltage is applied from the drive circuit 31, ultraviolet rays including short-wavelength ultraviolet rays are continuously or periodically irradiated to the measured water container 3 containing the measured water 2 from the ultraviolet light emitting unit 4. The current generated in the ultraviolet light receiving unit 5 is measured by the measuring circuit 32 and amplified. The amplified current is sent to the arithmetic circuit 33, and the arithmetic circuit 33 converts the signal from the measuring circuit 32 into a concentration of the ultraviolet absorbing substance. The result is displayed on the display unit 34. The description of the same operation as in the first embodiment is omitted.

(Embodiment 4) FIG. 4 is a schematic diagram of an apparatus for measuring dissolved substances in water according to Embodiment 4 of the present invention.

In FIG. 4, reference numeral 40 denotes an apparatus for measuring dissolved substances in water according to the fourth embodiment. The same components as those in the first and third embodiments are denoted by the same reference numerals, and the description is omitted.

The fourth embodiment differs from the third embodiment in that the measured water 2 is measured using the dissolved substance detector 20 in water in the second embodiment.

Next, the operation of the apparatus for measuring dissolved substances in water 40 according to the fourth embodiment will be described. When a voltage is applied from the drive circuit 31, the ultraviolet light including the short-wavelength ultraviolet light is continuously or periodically applied to the measured water 2 from the ultraviolet light emitting unit 4. The current generated in the ultraviolet light receiving unit 5 is measured by the measuring circuit 32 and amplified. The amplified current is sent to the arithmetic circuit 33,
The arithmetic circuit 33 converts the signal from the measuring circuit 32 into a concentration of the ultraviolet absorbing substance. The result is displayed on the display unit 34. The description of the same operation as in the first and third embodiments will be omitted.

In the above description, an example has been described in which the measured water 2 flows from the ultraviolet light emitting unit 4 side to the ultraviolet light receiving unit 5 side. However, the same applies to the case where the measured water 2 flows reversely. It is possible.

According to the third and fourth embodiments of the present invention, by using the dissolved substance detector in water of the first and second embodiments, nitric acid, nitrous acid, chlorine ion or Provide an apparatus for measuring dissolved substances in water that can measure the dissolved amount of a substance having a short-wavelength ultraviolet absorption property such as an organic substance, has excellent stability, is small in size, has low cost, has excellent mass productivity, and has little measurement error. Can be.

[0060]

As described above, according to the detector for dissolved substances in water and the measuring apparatus using the same according to the present invention, the following excellent effects can be realized.

According to the invention described in claim 1 of the present invention, (1) the ultraviolet ray receiving section is provided in a sealed container made of a transmission light regulating glass which does not transmit ultraviolet rays shorter than 185 nm, which is necessary for measurement. unable ultraviolet shorter than 185nm which is not the passage, it can be such as O ₂ was dissolved in an O ₂ gas or water surrounding atmosphere to suppress the water quality detection error due to absorption of ultraviolet radiation.

(2) Since a cathode having a photoelectric limit wavelength of 260 nm or less is used, it is unnecessary for measurement.
A substance dissolved in water can be measured without responding to light of nm or more and without using an external visible light blocking structure.

(3) Since the ultraviolet ray receiving portion is disposed in a hermetically sealed glass container which does not transmit ultraviolet rays shorter than 185 nm and which has a photoelectric limit wavelength of 260 nm or less, a spectral filter and a light condensing element are used. UV light of 185 to 260 nm can be measured without using a part.

According to the second aspect of the present invention,
In addition to the effect of claim 1, (4) the amount of light having a wavelength longer than 260 nm, which is unnecessary for measurement, can be weakened, so that the calorific value can be suppressed, and ultraviolet rays can be measured stably and accurately without using a cooling device. be able to.

According to the third aspect of the present invention,
In addition to the effects described in any one of claims 1 and 2, (5) cooling of the ultraviolet light receiving unit and / or the ultraviolet light emission source by the water to be measured can be performed, and a temperature rise in the detector is suppressed. In addition to improving the stability and accuracy of UV measurement.

According to the invention described in claim 4 of the present invention,
In addition to the effects described in any one of claims 1 to 3, (6) the ultraviolet light emitting source can be cooled efficiently and the temperature inside the detector can be kept constant, so that the sensitivity variation of the ultraviolet light receiving unit can be maintained. Can be prevented, and labor and automation of the analysis operation can be reduced.

According to the fifth aspect of the present invention,
In addition to the effects of any one of claims 1 to 4, (7) nitric acid, nitrous acid, hypochlorous acid, chloride ion, or
It is possible to provide a small-sized, low-cost, mass-production detector capable of stably measuring an organic substance having an absorption characteristic in the range of 250 nm to 260 nm.

According to the invention of claim 6 of the present invention, (8) the nitric acid and nitrous acid in water can be obtained by using the dissolved substance detector in water according to any one of claims 1 to 5. Measurement of dissolved substances in water, such as chlorine ions or organic substances, having short wavelength ultraviolet absorption characteristics, excellent stability, small size, low cost, excellent mass productivity, and little measurement error Equipment can be provided.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a dissolved substance detector in water according to Embodiment 1 of the present invention.

FIG. 2 is an overall configuration diagram of a dissolved substance detector in water according to Embodiment 2 of the present invention.

FIG. 3 is a schematic diagram of an apparatus for measuring dissolved substances in water according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram of an apparatus for measuring dissolved substances in water according to a fourth embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a conventional detector for dissolved substances in water.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underwater dissolved substance detector of Embodiment 1 2 Water to be measured 3 Storage container 3a Ultraviolet light incident surface 3b Ultraviolet light emitting surface 4 Ultraviolet light emitting portions 4a, 4b Lead wire of ultraviolet light emitting portion 5 Ultraviolet light receiving portion 6 Sealed container 7 Cathode 8 Discharge gas 9 Anode 10 Insulating spacer 11a, 11b Lead wire of ultraviolet ray receiving unit 20 Underwater dissolved substance detector 21 of Embodiment 2 Storage container 22 Inlet of measured water 23 Outlet of measured water 30 Dissolved in water of Embodiment 3 Substance measuring device 31 Drive circuit 32 Measurement circuit 33 Arithmetic circuit 34 Display unit 40 In-water dissolved substance measuring device of the fourth embodiment 50 Conventional dissolved-in-water substance detector 51 Deuterium lamp 52 Spectral filter 53 Light collecting unit 54 Photodiode 55 External Visible light blocking wall

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Naoto Matsuo 1006 Kazuma Kadoma, Kadoma-shi, Osaka F-term in Matsushita Electric Industrial Co., Ltd. (reference) 2G059 AA01 BB05 CC02 CC12 DD13 EE01 HH03 HH06 JJ21 KK02 LL04 NN01

Claims (6)

[Claims] A short wavelength ultraviolet region (185 nm to 260 n)
m) a container for storing the water to be measured containing a substance having ultraviolet absorption properties, an ultraviolet light emitting source for irradiating ultraviolet rays including short-wavelength ultraviolet light, and a substance irradiated from the ultraviolet light emitting source and contained in the water to be measured, An underwater dissolved substance detector comprising an ultraviolet ray receiving section that detects absorption-attenuated short-wavelength ultraviolet rays, wherein the ultraviolet ray receiving section is formed of a transmission light control glass that does not transmit ultraviolet rays shorter than at least 185 nm. A cathode formed of a material having at least a photoelectric limit wavelength of 260 nm or less, a discharge gas for multiplying electrons emitted from the cathode, and an anode for receiving electrons multiplied by the discharge gas. A dissolved substance detector in water, characterized in that: 2. The detector according to claim 1, wherein said ultraviolet light source is an ultraviolet lamp having an emission peak in a short wavelength ultraviolet region. 3. The detector for dissolved substances in water according to claim 1, wherein the ultraviolet ray receiving section and / or the ultraviolet ray emission source are disposed in the storage container of the water to be measured. 4. The detector according to claim 1, wherein the water to be measured is flowing water. 5. The substance having an ultraviolet absorbing property in the short wavelength ultraviolet range is nitric acid, nitrous acid, hypochlorous acid, chloride ion or an organic substance having an absorbing property in a range of 250 nm to 260 nm. Any one of items 1 to 4
Item 8. A detector for dissolved substances in water according to item 7. 6. A dissolved substance detector in water according to claim 1, a driving circuit for driving an ultraviolet light emitting portion of the dissolved substance detector in water, and the dissolved substance detector in water. A measuring circuit for measuring a minute current flowing through the ultraviolet light receiving unit, an arithmetic circuit for converting a signal from the measuring circuit into a concentration, and a display unit for displaying an arithmetic result of the arithmetic circuit. Water dissolved substance measuring device.