CN205120579U - Detection apparatus for be used for nitrite or nitrate - Google Patents
Detection apparatus for be used for nitrite or nitrate Download PDFInfo
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- CN205120579U CN205120579U CN201520913551.7U CN201520913551U CN205120579U CN 205120579 U CN205120579 U CN 205120579U CN 201520913551 U CN201520913551 U CN 201520913551U CN 205120579 U CN205120579 U CN 205120579U
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Abstract
The utility model discloses a detection apparatus for be used for nitrite or nitrate, including peristaltic pump, the cell that flows, light source, optical receiver, cadmium circle and seven three solenoid valve, three solenoid valve optionally advance appearance, circulation, color development, restore and waste discharge through control peristaltic pump and multichannel to shortened detection device's flow path, the integrated level is high, and is small, is fit for online analysis. Through adopting the circulation design, reaction efficiency improves greatly. Furthermore, the utility model discloses a cadmium encloses as the reduction part, lets the sample solution that awaits measuring flow through according to certain speed in the cadmium circle, has not only improved reduction efficiency but also avoided the work of relapse packing, and convenient operation is swift, has avoided the use of poisonous and harmful reagent simultaneously.
Description
Technical field
The utility model belongs to sea water analysis equipment technical field, specifically, relates to a kind of device for detecting nitrite in seawater and nitrate content.
Background technology
Nitrite, nitrate are extensively present in ocean water body, are one of important parameters of marine eco-environment monitoring.At present, the nitrite in seawater and nitrate measure mainly according to marine monitoring specification (GB17378-2007), adopt the spot sampling-laboratory method based on research ship.There is the shortcomings such as poor real, testing sample solution vulnerable to pollution, wasting manpower and material resources in the method.In recent years, one of on-line determination apparatus and method study hotspot becoming marine field.
At present, the main measuring methods of seawater nitrite, nitrate is spectrophotometric method, carries out quantitative measurement after utilizing Griess reaction solution.Wherein, nitrite can directly and developer react and detect; Nitrate measures after then needing to be reduced into nitrite again.The method that reduction nitrate is conventional is Cadmium reduction column, and namely under the condition of pH=8, nitrate measures after being reduced into nitrite by copper facing cadmium grain again.Although the method reduction efficiency is higher, along with the increase of access times, there will be the problem that reduction efficiency declines, need to reactivate cadmium grain, refill dress post, operate more consuming time.
The existing on-line checkingi to seawater nitrite, nitrate mainly relies on Flow Injection Technique, the instant absorbance measuring colour developing product.But check point now not necessarily reacts the highest point of completeness, there is the problems such as collimation difference, poor stability, reaction be incomplete.And, in reaction stream, be easy to produce bubble, the accuracy of testing result can be affected to a great extent.
Summary of the invention
The purpose of this utility model is to provide a kind of pick-up unit for nitrite or nitrate, to shorten stream, improves the integrated level of device.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
For a pick-up unit for nitrite or nitrate, comprising: the first three-way solenoid valve, its normal open entrance is for receiving sample solution to be detected, and its normally closed entrance is for receiving distilled water; Second three-way solenoid valve, its normal open entrance is communicated with the outlet of the first three-way solenoid valve; 3rd three-way solenoid valve, its normal open entrance is communicated with the outlet of the second three-way solenoid valve, and its normally closed entrance is for receiving buffer solution; 4th three-way solenoid valve, its normal open entrance is communicated with the outlet of the 3rd three-way solenoid valve, and its normally closed entrance is communicated with the outlet of described 3rd three-way solenoid valve by cadmium circle; 5th three-way solenoid valve, its normal open entrance is communicated with the outlet of the 4th three-way solenoid valve, and its normally closed entrance is for receiving the first developer; 6th three-way solenoid valve, its normal open entrance is communicated with the outlet of the 5th three-way solenoid valve, and its normally closed entrance is for receiving the second developer; Peristaltic pump, its entrance is communicated with the outlet of the 6th three-way solenoid valve; Floating cuvette, its entrance is communicated with wriggling delivery side of pump, and described floating cuvette is provided with light entrance port and optical emission exit; Light source, it is just to the described smooth entrance port of described floating cuvette, and emission of light irradiates the liquid in floating cuvette; Optical receiver, it just to the described optical emission exit of described floating cuvette, is received the light penetrated by optical emission exit, and converts electric signal to, export signal processing system to; 7th three-way solenoid valve, its entrance is communicated with the outlet of floating cuvette, and the outlet of its normal open is used for effluent discharge, the normally closed entrance of its normally closed outlet second three-way solenoid valve.
In order to avoid the bubble in stream impacts testing result, preferably the outlet of described floating cuvette is positioned at the top of floating cuvette; Described smooth entrance port and optical emission exit divide be located at floating cuvette left side wall and right side wall on, and to be positioned on same axis.
Preferably, the entrance of described floating cuvette is also positioned at the top of floating cuvette.
Preferably, described floating cuvette is made up of quartz, and its inside is rectangular parallelepiped or column type cavity, and outside is enclosed with black polyethylene lucifuge shell.
Preferably, centered by described light source, wavelength is the LED of 530nm; Described optical receiver is photodiode.
Preferably, described cadmium circle preferably by cadmium pipe ring around forming, be coated with PVC protective seam, with isolated air and water in the outside of described cadmium pipe.
Further, a threeway is also comprised in described pick-up unit, described threeway is T-shaped or Y type, its entrance is communicated with the outlet of described 3rd three-way solenoid valve, two outlet one is communicated with the normal open entrance of described 4th three-way solenoid valve, and another is communicated with the normally closed entrance of described 4th three-way solenoid valve by described cadmium circle.
Conveniently in pick-up unit, the entirety of each parts is assembled, fluid branch manifold valve plate is also comprised in described pick-up unit, fluid passage is carved with in the inside of described fluid branch manifold valve plate, described peristaltic pump, floating cuvette, light source, photodiode, cadmium circle and all three-way solenoid valves are arranged on described fluid branch manifold valve plate, are communicated with by described fluid passage between the three-way solenoid valve of each road.
Compared with prior art, advantage of the present utility model and good effect are:
1, pick-up unit of the present utility model utilizes peristaltic pump and multichannel three-way solenoid valve selectivity sample introduction, circulation, colour developing, reduction and waste discharge, and shorten the stream of pick-up unit, integrated level is high, and volume is little, is adapted at line analysis;
2, pick-up unit of the present utility model adopts cadmium circle as reduction parts, sample solution to be measured is allowed to flow through according to certain speed in cadmium circle, both improve reduction efficiency and turn avoid the work of repeatedly filling, carry out cleaning and activating as long as use first, without the need to taking off when again activating, can complete in stream, convenient to operation, avoid the use of poisonous and harmful reagent simultaneously;
3, pick-up unit of the present utility model adopts circulation design, and reaction efficiency improves greatly, and the resultant of reaction concentration in whole loop is homogeneous, contributes to the collimation and the stability that improve testing result.
4, pick-up unit of the present utility model adopts the column flow cuvette that liquid flows from the bottom up, makes the bubble produced in the process of liquid flow all concentrate on the top of check point, does not form interference to testing result.
After reading the detailed description of the utility model embodiment by reference to the accompanying drawings, other features of the present utility model and advantage will become clearly.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of a kind of embodiment of the pick-up unit for nitrite or nitrate that the utility model proposes.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
The pick-up unit of the present embodiment is mainly for detection of the content of the nitrite or nitrate in the sample solutions such as seawater, comprise the chief component such as peristaltic pump P, floating cuvette F, light source led, optical receiver D, a cadmium circle C and seven three-way solenoid valve V1-V7, as shown in Figure 1.
Installation for the ease of parts each in pick-up unit is fixed, and the present embodiment preferably arranges fluid branch manifold valve plate (not shown) in described pick-up unit, preferably adopts organic glass to make, to prevent the erosion of the solution such as acid, alkali, high salt.Be etched with many fluid passages in the inside of described fluid branch manifold valve plate, these fluid passages are used for being communicated with three-way solenoid valve as a part for stream, to shorten the length of stream, reduce interface and leak source.The present embodiment offers threaded hole and drainage through hole on described fluid branch manifold valve plate, described threaded hole such as, for adopting the miscellaneous part in the mode fixed test device that is threaded, three-way solenoid valve V1-V7, peristaltic pump P, floating cuvette F, light source led, optical receiver D, cadmium circle C and fluid delivery tube etc.; Described drainage through hole is for being communicated with the fluid passage of three-way solenoid valve and valve plate inside.
7 described three-way solenoid valve V1-V7 are two-position three way, and always an aperture on first is connected on stream, can as outlet, also can as entrance; Second has two apertures, one is normal open mouth, and another is normally closed port, and these two apertures must simultaneously as entrance or outlet.For two apertures be on second, defining the aperture that the described aperture of three-way solenoid valve V1-V7 when power-off is closed and on first be in connected state is normal open mouth, and the aperture being in state of isolation with the aperture on first is normally closed port.Three-way solenoid valve V1-V7 be energized open time, the aperture on described normal open mouth and first completely cuts off, and described normally closed port is communicated with the aperture on first.Change the power on/off state of three-way solenoid valve V1-V7, flow direction and the selectivity that can control fluid flow into.In the present embodiment, described three-way solenoid valve V1-V7 preferably adopts PEEK material to make, to prevent the erosion of the solution such as acid, alkali, high salt.
In the present embodiment, using the aperture that wherein six three-way solenoid valve V1-V6 is on first as outlet, be in two apertures on second as entrance; Using the aperture on first in the 7th three-way solenoid valve V7 as entrance, two apertures on second are as outlet.
Below in conjunction with Fig. 1, the concrete annexation between all parts in described pick-up unit is described in detail.
As shown in Figure 1, the normal open entrance of the first three-way solenoid valve V1 is communicated with by the vessel of fluid delivery tube with splendid attire testing sample solution by the present embodiment, for receiving sample solution to be measured.The normally closed entrance of the first three-way solenoid valve V1 is communicated with distilled water DIW via fluid delivery tube, for introducing distilled water DIW.The outlet of one three-way solenoid valve V1 is communicated with the normal open entrance of the second three-way solenoid valve V2 through the fluid passage of described fluid branch manifold valve plate inside etching.Described fluid delivery tube preferably adopts polyfluortetraethylene pipe or the silicone tube that external diameter is 1-4mm, internal diameter is 0.5-2mm, flows while requirement fast meeting liquid, can tolerate the corrosion of the solution such as strong acid, highly basic, high salt.For described second three-way solenoid valve V2, by the fluid passage of its normally closed entrance by fluid branch manifold valve plate inside etching or the normally closed outlet of fluid delivery tube and the 7th three-way solenoid valve V7, form closed loop.The fluid passage of the outlet of the second three-way solenoid valve V2 by fluid branch manifold valve plate inside etching is communicated with the normal open entrance of the 3rd three-way solenoid valve V3.The normally closed entrance of the 3rd three-way solenoid valve V3 is communicated with buffer solution BUF by fluid delivery tube, is incorporated in stream for by buffer solution BUF.The outlet of the 3rd three-way solenoid valve V3 is communicated with the entrance of a threeway T by the fluid passage of fluid branch manifold valve plate inside etching or fluid delivery tube, described threeway T can be T-shaped threeway, also can be Y-type three way type, one of them outlet of threeway T is communicated with the normal open entrance of the 4th three-way solenoid valve V4 through the fluid passage of fluid branch manifold valve plate inside etching or fluid delivery tube, the outlet of the another one of threeway T is communicated with through the entrance of fluid delivery tube with cadmium circle C.Described cadmium circle C can by cadmium pipe ring around forming, an entrance, an outlet, can play the effect of mixing while the nitrate in reduction sample solution.In the present embodiment, the internal diameter of described cadmium pipe can between 1.0-2.0mm, and external diameter can between 1.5-5.0mm, around the number of turns preferably between 3-20 circle, to meet the reduction requirement of nitrate.Preferred coated one deck PVC protective seam in the outside of described cadmium pipe, with isolated air and water.The outlet of cadmium circle C be communicated with by the normally closed entrance of fluid delivery tube with the 4th three-way solenoid valve V4, the outlet of the 4th three-way solenoid valve V4 is communicated with the normal open entrance of the 5th three-way solenoid valve V5 by the fluid passage of fluid branch manifold valve plate inside etching.The normally closed entrance of described 5th three-way solenoid valve V5 is communicated with the first developer SAA by fluid delivery tube, is incorporated in stream for by the first developer SAA.The fluid passage of the outlet of described 5th three-way solenoid valve V5 through fluid branch manifold valve plate inside etching is communicated with the normal open entrance of the 6th three-way solenoid valve V6, the normally closed entrance of the 6th three-way solenoid valve V6 is communicated with the second developer NED by fluid delivery tube, is incorporated in stream for by the second developer NED.The outlet of described 6th three-way solenoid valve V6 be communicated with by the entrance of fluid delivery tube with peristaltic pump P, the outlet of described peristaltic pump P is communicated with by the entrance of fluid delivery tube with floating cuvette F.In the present embodiment, described peristaltic pump P preferably adopts 6 rotor pulse pumps, and pump discharge is between 0.4 ~ 24ml/min.Described floating cuvette F preferably adopts quartz material to make, and its inside is rectangular parallelepiped or column type cavity, and outside is enclosed with black polyethylene lucifuge shell.On relative two sidewalls of floating cuvette F, such as, on left side wall and right side wall, offer two relative windows respectively, using as light entrance port and optical emission exit.The light path designing described floating cuvette F is 1-5cm, width is 10-25mm, height 20-50mm, and window is wide is 1-10mm, high 2-20mm.The entrance and exit of floating cuvette F is all arranged on the top of cavity, makes fluid after filling whole floating cuvette F, could flow out from outlet.Because the bubble coalescence produced in liquid is at the top of cavity, interference can not be produced to the light of incidence, therefore can stop the impact that bubble causes testing result, improve the accuracy of testing result.The outlet of floating cuvette F be communicated with by the entrance of fluid delivery tube with the 7th three-way solenoid valve V7, the normal open outlet of the 7th three-way solenoid valve V7 connects fluid delivery tube, for effluent discharge W; The normally closed outlet of the 7th three-way solenoid valve V7 is communicated with the normally closed entrance of the second three-way solenoid valve V2, to form closed loop.
In the present embodiment, consider the extinction characteristic of nitrite, described light source preferably adopts centre wavelength to be that the LED of 530nm is to irradiate sample solution to be measured.Specifically, by the exiting surface of light source led just to the light entrance port of floating cuvette F, the centre wavelength sent by light source led be 530nm light line focus, coupling after, by fiber optic conduction incident light entrance port, and by after the liquid absorption in floating cuvette F, transmit through optical emission exit, gathered by optical receiver D and change out the electric signal corresponding with the light intensity received, be sent to signal processing system PC, with the absorbance of produce liquid.In the present embodiment, described optical receiver D preferably adopts photodiode to carry out collection and the conversion of light, the absorbance of testing sample solution and the nitrite absorbance-concentration relationship curve of standard that signal processing system PC are calculated generation contrast, and just can obtain the concentration of sample solution nitrite.
In the pick-up unit of the present embodiment, can controller be set, opening and closing be carried out to described peristaltic pump P, light source led, optical receiver D and three-way solenoid valve V1-V7 and controls.
Utilize the pick-up unit shown in Fig. 1, by controlling the opening and closing of peristaltic pump P and three-way solenoid valve V1, V2, V5, V6, V7, come Quality control solution S, the first developer SAA, the Loading sequence of the second developer NED, sample size and circulation reaction time.Then, open the liquid in light source led irradiation floating cuvette F, and utilize the light intensity that optical receiver D acquisition of transmission exports, be sent to signal processing system PC with the absorbance of produce liquid, and then the mensuration to testing sample solution S nitrite can be completed according to the corresponding relation curve between the absorbance of nitrite and concentration.
For the mensuration of nitrate content in sample solution S, need the content first determining nitrite according to above-mentioned control method, then the flowing of liquid is kept by controlling peristaltic pump P, and control three-way solenoid valve V1 and again pump into sample solution S to be measured, control three-way solenoid valve V3 and V4 unlatching afterwards and realize pumping into of buffer solution BUF, and sample solution S to be measured is reduced through cadmium circle C stream, after nitrate reduction in sample solution S is become nitrite, opened successively by control three-way solenoid valve V5 and V6 and realize in succession adding of the first developer SAA and the second developer NED, then control three-way solenoid valve V2 and V7 and open formation circulation, to realize repeatedly effectively carrying out of reduction reaction and chromogenic reaction.Sample solution S after reduction and chromogenic reaction is carried out to the mensuration of content of nitrite, the content of nitrite now calculated is the summation of sample solution S nitrite and nitrate content.Therefore, the content of nitrite calculated before the content of nitrite this calculated deducts, can obtain the content of nitrate in sample solution S.Finally, closing by controlling three-way solenoid valve V2 and V7, disconnecting circulation, so that waste liquid W is discharged, ready for measuring work next time.
Certainly; the above is only a kind of preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. for a pick-up unit for nitrite or nitrate, it is characterized in that, comprising:
First three-way solenoid valve, its normal open entrance is for receiving sample solution to be detected, and its normally closed entrance is for receiving distilled water;
Second three-way solenoid valve, its normal open entrance is communicated with the outlet of the first three-way solenoid valve;
3rd three-way solenoid valve, its normal open entrance is communicated with the outlet of the second three-way solenoid valve, and its normally closed entrance is for receiving buffer solution;
4th three-way solenoid valve, its normal open entrance is communicated with the outlet of the 3rd three-way solenoid valve, and its normally closed entrance is communicated with the outlet of described 3rd three-way solenoid valve by cadmium circle;
5th three-way solenoid valve, its normal open entrance is communicated with the outlet of the 4th three-way solenoid valve, and its normally closed entrance is for receiving the first developer;
6th three-way solenoid valve, its normal open entrance is communicated with the outlet of the 5th three-way solenoid valve, and its normally closed entrance is for receiving the second developer;
Peristaltic pump, its entrance is communicated with the outlet of the 6th three-way solenoid valve;
Floating cuvette, its entrance is communicated with wriggling delivery side of pump, and described floating cuvette is provided with light entrance port and optical emission exit;
Light source, it is just to the described smooth entrance port of described floating cuvette, and emission of light irradiates the liquid in floating cuvette;
Optical receiver, it just to the described optical emission exit of described floating cuvette, is received the light penetrated by optical emission exit, and converts electric signal to, export signal processing system to;
7th three-way solenoid valve, its entrance is communicated with the outlet of floating cuvette, and the outlet of its normal open is used for effluent discharge, the normally closed entrance of its normally closed outlet second three-way solenoid valve.
2. the pick-up unit for nitrite or nitrate according to claim 1, is characterized in that, the outlet of described floating cuvette is positioned at the top of floating cuvette; Described smooth entrance port and optical emission exit divide be located at floating cuvette left side wall and right side wall on, and to be positioned on same axis.
3. the pick-up unit for nitrite or nitrate according to claim 2, is characterized in that, the entrance of described floating cuvette is positioned at the top of floating cuvette.
4. the pick-up unit for nitrite or nitrate according to claim 2, is characterized in that, described floating cuvette is made up of quartz, and its inside is rectangular parallelepiped or column type cavity, and outside is enclosed with black polyethylene lucifuge shell.
5. the pick-up unit for nitrite or nitrate according to claim 1, is characterized in that, centered by described light source, wavelength is the LED of 530nm; Described optical receiver is photodiode.
6. the pick-up unit for nitrite or nitrate according to claim 1, is characterized in that, described cadmium circle around forming, is coated with PVC protective seam in the outside of described cadmium pipe by cadmium pipe ring.
7. the pick-up unit for nitrite or nitrate according to claim 1, it is characterized in that, also comprise a threeway, described threeway is T-shaped or Y type, its entrance is communicated with the outlet of described 3rd three-way solenoid valve, two outlet one is communicated with the normal open entrance of described 4th three-way solenoid valve, and another is communicated with the normally closed entrance of described 4th three-way solenoid valve by described cadmium circle.
8. the pick-up unit for nitrite or nitrate according to any one of claim 1 to 7, it is characterized in that, also comprise fluid branch manifold valve plate, fluid passage is carved with in the inside of described fluid branch manifold valve plate, described peristaltic pump, floating cuvette, light source, photodiode, cadmium circle and all three-way solenoid valves are arranged on described fluid branch manifold valve plate, are communicated with by described fluid passage between the three-way solenoid valve of each road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520913551.7U CN205120579U (en) | 2015-11-17 | 2015-11-17 | Detection apparatus for be used for nitrite or nitrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520913551.7U CN205120579U (en) | 2015-11-17 | 2015-11-17 | Detection apparatus for be used for nitrite or nitrate |
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| CN205120579U true CN205120579U (en) | 2016-03-30 |
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| CN201520913551.7U Expired - Fee Related CN205120579U (en) | 2015-11-17 | 2015-11-17 | Detection apparatus for be used for nitrite or nitrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319171A (en) * | 2015-11-17 | 2016-02-10 | 山东省科学院海洋仪器仪表研究所 | Detection device and detection method of nitrite or nitrate content |
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2015
- 2015-11-17 CN CN201520913551.7U patent/CN205120579U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319171A (en) * | 2015-11-17 | 2016-02-10 | 山东省科学院海洋仪器仪表研究所 | Detection device and detection method of nitrite or nitrate content |
| CN105319171B (en) * | 2015-11-17 | 2018-12-25 | 山东省科学院海洋仪器仪表研究所 | The detection device and detection method of nitrite or nitrate content |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160330 Termination date: 20171117 |