CN112903612A - Online analyzer for anionic surfactant - Google Patents
Online analyzer for anionic surfactant Download PDFInfo
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- CN112903612A CN112903612A CN202110105780.6A CN202110105780A CN112903612A CN 112903612 A CN112903612 A CN 112903612A CN 202110105780 A CN202110105780 A CN 202110105780A CN 112903612 A CN112903612 A CN 112903612A
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- 239000003945 anionic surfactant Substances 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 28
- 238000005406 washing Methods 0.000 claims abstract description 26
- 238000000605 extraction Methods 0.000 claims abstract description 24
- 238000002835 absorbance Methods 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims description 41
- 239000000243 solution Substances 0.000 claims description 33
- 238000004140 cleaning Methods 0.000 claims description 24
- 238000010168 coupling process Methods 0.000 claims description 18
- 238000005859 coupling reaction Methods 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000007853 buffer solution Substances 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000002572 peristaltic effect Effects 0.000 claims description 4
- 239000013062 quality control Sample Substances 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 238000005070 sampling Methods 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 18
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 229960000907 methylthioninium chloride Drugs 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 6
- 239000012074 organic phase Substances 0.000 description 6
- 231100000331 toxic Toxicity 0.000 description 5
- 230000002588 toxic effect Effects 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000013543 active substance Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 1
- 230000003444 anaesthetic effect Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002740 effect on eyes Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 210000001533 respiratory mucosa Anatomy 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses an online analyzer for anionic surfactant, which comprises a pipeline joint, a control module, a sample introduction module, an extraction detection module, a washing module, a liquid discharge module and a reversing valve assembly, wherein the sample introduction module, the extraction detection module, the washing module, the liquid discharge module and the reversing valve assembly are connected with the control module through signals; the extraction detection module comprises a first cup body, an air pump, a one-way valve and a first stirring device, the bottom of the first cup body is provided with an absorbance detection device, the washing module comprises a second cup body and a second stirring device, and a second dosing pump is connected in series on a pipeline of the second cup body. The control module can fully automate the steps of sample introduction, metering, reaction, extraction, washing, measurement and the like according to a preset program, has the advantages of small sampling volume and accuracy, realizes automatic and rapid analysis of the content of the anionic surfactant in the water quality, and provides guarantee for long-term accurate monitoring.
Description
Technical Field
The invention relates to the technical field of environmental monitoring, in particular to an online analyzer for an anionic surfactant.
Background
The anionic surfactant belongs to an important chemical raw material, is gathered on the surfaces of water and other particles after entering the water, and generates foam or generates emulsification when the anionic surfactant in the water body reaches a certain concentration, so that a foam covering layer is formed on the surface of the water body, thereby blocking the exchange of oxygen between the atmosphere and the water, causing the deterioration of water quality and harming aquatic organisms. The overproof rate of anionic surfactants in partial rivers in China is also increasing continuously, and the determination of the anionic surfactants in water is particularly important in order to improve the environment, control pollution, improve the water quality level and guarantee the physical and mental health of people.
Commonly used methods for measuring anionic surfactants include methylene blue spectrophotometry and flow injection-methylene blue spectrophotometry, wherein methylene blue serving as a cationic dye reacts with an anionic surfactant to generate blue salts, which are collectively called Methylene Blue Active Substances (MBAS). The resultant was subjected to multiple chloroform extractions and washings, and finally the volume was determined, and the absorbance of the chloroform layer was measured at a wavelength of 652nm with a spectrophotometer.
The existing detection mode mainly takes manual detection and laboratory automation instrument detection as main parts, and the manual detection has the defects that the preparation and operation methods of standard liquid cannot be standardized, such as oscillation time and oscillation force during extraction, and each experiment cannot be guaranteed to be uniform and standard, and errors are easy to occur; the laboratory instrument detection method has the defects that online monitoring of a water sample cannot be achieved, the test data of the water sample needs manual sample introduction and manual sampling every time, then the water sample is transported to a laboratory from a manual monitoring point to be tested, active ingredients in the water sample can be changed due to environmental changes in the transportation process, and the two detection methods have the problems of complex operation, complex analysis steps, time consumption and labor consumption.
Therefore, how to solve the problems of easy error generation, complex operation, time consumption and labor consumption existing in the existing detection method is a problem to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of this, the invention aims to provide an online analyzer for anionic surfactants, which improves the accuracy and convenience of detection and avoids harm to experimenters in the detection process.
In order to achieve the above purpose, the invention provides the following technical scheme:
an online analyzer for anionic surfactant comprises a pipeline joint, a control module, a sample introduction module, an extraction detection module, a washing module, a liquid discharge module and a reversing valve assembly, wherein the sample introduction module, the extraction detection module, the washing module, the liquid discharge module and the reversing valve assembly are respectively in signal connection with the control module;
the sample introduction module comprises a main pipeline and 12 external interfaces which can be respectively controlled and conducted with the main pipeline, and the outlet end of the main pipeline is connected to the interface A through a pipeline; a double optical coupling quantitative component and a first quantitative pump are connected in series on the pipeline between the main pipeline and the interface A;
the extraction detection module comprises a first cup body, an air pump, a one-way valve and a first stirring device arranged above the first cup body, wherein the bottom of the first cup body is provided with an absorbance detection device, the lower end opening of the first cup body is connected to the G interface through a pipeline, the air outlet of the air pump is connected to the air inlet of the one-way valve through a pipeline, and the air outlet of the one-way valve is connected to a pipeline between the first cup body and the G interface through a pipeline;
the washing module comprises a second cup body and a second stirring device arranged above the second cup body, the lower end opening of the second cup body is connected to the C interface through a pipeline, and a second constant displacement pump is connected in series on the pipeline between the second cup body and the C interface;
the liquid discharge module comprises a liquid discharge pump, and the liquid discharge pump is connected to the D interface through a pipeline.
Preferably, the reversing valve assembly is a three-way reversing valve.
Preferably, the pipeline joint is a cross joint.
Preferably, the first quantitative pump and the second quantitative pump are both peristaltic pumps.
Preferably, the absorbance detection device comprises an LED lamp light source and a photodiode.
Preferably, the inlet end of the drainage pump is connected to the D connector, and the outlet end of the drainage pump is connected to a waste liquid collection box for collecting waste liquid.
Preferably, the sampling module includes a first main pipeline, 6 first external interfaces which can be respectively conducted with the first main pipeline, a second main pipeline and 6 second external interfaces which can be respectively conducted with the second main pipeline, the outlet end of the first main pipeline is connected with the interface A through a pipeline, the outlet end of the second main pipeline is communicated with the inlet end of the first main pipeline and 6 first external interfaces are respectively connected with an extracting agent conveying pipeline, a color developing agent conveying pipeline, a buffer solution conveying pipeline, a washing solution conveying pipeline, a high-standard conveying pipeline and a standby pipeline, and 6 second external interfaces are respectively connected with an air conveying pipeline, a pure water conveying pipeline, a washing solution conveying pipeline, a water sample conveying pipeline, a quality control sample conveying pipeline and a low-standard conveying pipeline.
Preferably, the upper portion of first cup is equipped with first exhaust hole, first exhaust hole passes through pipe connection in first tail gas treatment module.
Preferably, the upper portion of second cup is equipped with first exhaust hole, the second exhaust hole passes through pipe connection in second exhaust treatment module.
Preferably, the first exhaust treatment module and the second exhaust treatment module both comprise activated carbon.
According to the online analyzer for the anionic surfactant, the control module can automatically control the configuration of various solutions according to a preset program, the solution can be accurately and quantitatively extracted by using the double-optical coupling quantitative component, the first quantitative pump and the second quantitative pump, the steps of sample introduction, metering, reaction, extraction, washing, measurement and the like are fully automated, the online analyzer has the advantages of small sampling volume and accurate sampling, the content of the anionic surfactant in water can be automatically and quickly analyzed, and the online analyzer provides reliable guarantee for long-term and accurate monitoring of the anionic surfactant in water. All the components of the invention can be fixed on the mounting plate, the device is light and handy, and can be installed in a water station to realize the online monitoring of the anionic surfactant in water quality. The uncertainty of manual operation is solved, the harm of a toxic extracting agent to experimenters and the environment is avoided, and the analysis time is shortened. In addition, reasonable and effective treatment steps can be set according to different water quality conditions, and the dosage of the toxic extracting agent is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an on-line analyzer for anionic surfactants provided by the present invention.
Wherein, the device comprises 10-a first main pipeline, 11-an extractant conveying pipeline, 12-a color developing agent conveying pipeline, 13-a buffer solution conveying pipeline, 14-a washing solution conveying pipeline, 15-a standby pipeline, 16-a high-standard conveying pipeline, 20-a second main pipeline, 21-an air conveying pipeline, 22-a pure water conveying pipeline, 23-a cleaning solution conveying pipeline, 24-a water sample conveying pipeline, 25-a quality control sample conveying pipeline, 26-a low-standard conveying pipeline, 30-a first quantitative pump, 31-a double-optical coupling quantitative component, 40-a pipeline joint, 41-a reversing valve component, 50-a liquid discharge pump, 60-a second quantitative pump, 70-an air pump, 71-a one-way valve, 80-a first cup body, 81-a first stirring device, 82-a first tail gas processing module, 83-absorbance detection device, 90-second cup, 91-second stirring device and 92-second tail gas treatment module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an online analyzer for an anionic surfactant, which improves the accuracy and convenience of detection and avoids harm to experimenters in the detection process.
Referring to fig. 1, fig. 1 is a schematic diagram of an embodiment of an online anionic surfactant analyzer according to the present invention.
The invention provides an online analyzer for an anionic surfactant, which comprises a pipeline joint 40, a control module, a sample introduction module, an extraction detection module, a washing module, a liquid discharge module and a reversing valve assembly 41, wherein the sample introduction module, the extraction detection module, the washing module, the liquid discharge module and the reversing valve assembly are respectively connected with the control module through signals, the pipeline joint 40 comprises an interface A, an interface B, an interface C and an interface D which are mutually communicated, the reversing valve assembly 41 comprises an interface E, an interface F and an interface G, the interface F and the interface G can be respectively controlled and communicated with the interface E, the interface E is connected with the;
the sample injection module comprises a main pipeline and 12 external interfaces which can be respectively controlled and conducted with the main pipeline, and the outlet end of the main pipeline is connected to the interface A through a pipeline; a double-optical coupling quantitative component 31 and a first quantitative pump 30 are connected in series on the pipeline between the main pipeline and the interface A;
the extraction detection module comprises a first cup body 80, an air pump 70, a one-way valve 71 and a first stirring device 81 arranged above the first cup body 80, the bottom of the first cup body 80 is provided with an absorbance detection device 83, the lower end opening of the first cup body 80 is connected to a G interface through a pipeline, the air outlet of the air pump 70 is connected to the air inlet of the one-way valve 71 through a pipeline, and the air outlet of the one-way valve 71 is connected to a pipeline between the first cup body 80 and the G interface through a pipeline;
the washing module comprises a second cup body 90 and a second stirring device 91 arranged above the second cup body 90, the lower end opening of the second cup body 90 is connected to the C interface through a pipeline, a second constant displacement pump 60 is connected in series on the pipeline between the second cup body 90 and the C interface, and the second constant displacement pump 60 is a bidirectional pump;
the liquid discharge module comprises a liquid discharge pump 50, and the liquid discharge pump 50 is connected to the D interface through a pipeline.
Wherein, the feeding module includes the main line and can switch on with the main line control 12 external interfaces, every external interface all is used for with the tube coupling of a transport solution, 12 external interfaces one-to-one connect in extractant conveying line 11, colour development agent conveying line 12, buffer solution conveying line 13, washing liquid conveying line 14, high mark conveying line 16, air conveying line 21, pure water conveying line 22, washing liquid conveying line 23, water sample conveying line 24, quality control appearance conveying line 25, low mark conveying line 26 connects.
The exit end of main pipeline is connected with two optical coupling ration subassemblies 31 and first ration pump 30, and control module can make arbitrary external conveying pipeline and main pipeline switch on through the switching of 12 external interfaces on the control main pipeline, and simultaneously, control module can be accurate through the required solution of extraction of control two optical coupling ration subassemblies 31 and first ration pump 30.
During the use, control module opens in proper order according to presetting the corresponding external interface on the program control trunk line to through two optical coupling ration subassemblies 31 and first ration pump 30 accurate sample, buffer solution, colour-developing agent and extractant in first cup 80 of drawing according to this.
The bottom of the first cup 80 is provided with an absorbance detection device 83, and the absorbance detection device 83 includes a light source and a photodiode. After the solution in the first cup 80 is stirred, the control module controls to close the first stirring device 81 and the air pump 70, the solution is kept still for layering, the light source emits 652nm monochromatic light, according to the Lambert beer law, the ratio of the incident light intensity before passing through the water sample to be detected to the transmission light intensity after the light passes through the water sample to be detected is recorded through the control module and the photodiode, the logarithm taking 10 as the base number is used, the absorbance value can be obtained, and the standard working curve is substituted to obtain the concentration of the anionic surfactant in the water sample to be detected.
The washing module comprises a second cup body 90, a second stirring device 91 arranged above the second cup body 90 and a second quantitative pump 60 arranged on a pipeline between the second cup body and the first cup body 80, wherein the second quantitative pump 60 is a bidirectional pump, namely, under the control of the control module, the second quantitative pump 60 can pump the solution in the second cup body 90 to the first cup body 60 and can also pump the solution in the first cup body 60 to the second cup body 90. The first stirring device 81 and the second stirring device 91 both include a stirring electrode and a stirring blade.
If the interference anion content of the water sample to be measured in the first cup 80 is more, after the cleaning solution is accurately extracted in the second cup 90 through the double-optical coupling quantitative component 31 and the first quantitative pump 30, and the second quantitative pump 60 is controlled to be started through the control module, so that the second quantitative pump 60 accurately and quantitatively extracts the lower-layer solution in the second cup 90 from the first cup 80, the second stirring device 91 is started, the stirring blades in the second cup 90 are stirred at a high speed, the solution is fully back-extracted, the second stirring device 91 is closed, and the solution is layered. Then the lower layer solution is precisely and quantitatively pumped from the second cup 90 into the first cup 80 by the second quantitative pump 60, and the absorbance is detected.
The drain module comprises a drain pump 50, and the drain pump 50 is connected to the lower ends of the first cup 80 and the second cup 90 and is mainly used for emptying the solution in the device during starting and after analysis.
Considering the specific setting of the control module, preferably, the control module comprises a measurement and control circuit board, a pump valve interface board and an operation screen carrying an android control system, and the integrated intelligent control module comprises an android control screen and a single chip microcomputer. The android screen is preferably a device with good performance, large storage space and high operation speed, main control software is carried for operating and displaying the whole process running through the system and independently controlling the debugging process, data analysis results and other relevant necessary process parameters can be visually displayed, human-computer interaction is facilitated, and a human-computer interaction interface is friendly.
And preset flows such as automatic liquid preparation and conveying are written into the android screen through the single chip microcomputer, and the operation is automatically called through the system. And the opening and closing of a single pump valve in the whole system can be controlled independently, so that the debugging of workers is facilitated. The intelligent control module supports two power supply modes of commercial power or a storage battery and can be used under different working conditions.
The specific operation flow is as follows:
1. the light source is controlled to be turned on.
2. Liquid drainage: the drain pump 50 is started to evacuate the apparatus and waste liquid remaining in the pipeline.
3. Cleaning: and controlling to open the external interface connected with the cleaning liquid conveying pipeline 23 to enable the external interface to be communicated with the main pipeline, keeping other external interfaces closed, extracting the cleaning liquid cleaning device and the cleaning liquid pipeline, and then extracting the pure water in the pure water cleaning device, the cleaning liquid pipeline, the pure water emptying device and the pure water pipeline after emptying the cleaning liquid in the cleaning liquid cleaning device and the cleaning liquid pipeline through the liquid discharge pump 50.
4. Reading the reference light intensity: the external connection interface connected with the pure water delivery pipeline 22 is controlled to be opened to lead the pure water delivery pipeline to be communicated with the main pipe, other external connection interfaces are kept closed, 1ml of pure water is accurately pumped into the first cup body by utilizing the first quantitative pump 30 and the double-optical coupling quantitative component 31, then the external connection interface connected with the extractant delivery pipeline 11 is controlled to be opened to lead the extraction agent to be communicated with the main pipe, other external connection interfaces are kept closed, 1.0ml of extractant chloroform is accurately pumped into the first cup body 80 by utilizing the first quantitative pump 30 and the double-optical coupling quantitative component 31, and the reference light intensity is read.
5. Liquid drainage: the drain pump 50 is activated to drain the liquid remaining in the first cup.
6. Water inlet sample: the external interface connected with the water sample conveying pipeline 24 is controlled to be opened to be communicated with the main pipeline, other external interfaces are kept closed, 10.0ml of water sample is accurately extracted into the first cup 80 by utilizing the first quantitative pump 30 and the double-optical coupling quantitative component 31, at the moment, the second quantitative pump 60 and the liquid discharge pump 50 are both in a closed state, and the E interface and the G interface of the reversing valve component 41 are communicated, so that the water sample enters the reversing valve component 41 through the A interface and the B interface of the pipeline joint 40 and finally enters the first cup 80 through the E interface and the G interface of the reversing valve component 41.
7. Adjusting the pH value: the external connection interface connected with the buffer solution conveying pipeline 13 is controlled to be opened, so that the buffer solution conveying pipeline is conducted with the main pipeline, other external connection interfaces are kept closed, the first constant-volume pump 30 and the double-light-coupling constant-volume component 31 are controlled to accurately pump 0.1ml of buffer solution into the first cup 80, and the pH value of a water sample can be adjusted to be alkalescent.
8. Color development: the external interface connected with the color reagent conveying pipeline 12 is controlled to be opened, so that the color reagent conveying pipeline is communicated with the main pipeline, other external interfaces are kept closed, and 2.5ml of color reagent is accurately pumped into the first cup 80 by using the first quantitative pump 30 and the double-optical-coupling quantitative component 31.
9. And (3) extraction: the external connection interface connected with the extracting agent conveying pipeline 11 is controlled to be opened to be communicated with the main pipeline, other external connection interfaces are kept closed, 1.5ml of extracting agent is accurately pumped into the first cup body by the first quantitative pump 30 and the double-optical coupling quantitative component 31, the first stirring device 81 is controlled to be opened, stirring blades are rapidly stirred in the first cup body 80, meanwhile, the air pump 70 is controlled to be opened, the air pump 70 can bubble into the first cup body 80 orderly and stably to enable the first cup body to react fully, the stirring efficiency is improved, after stirring is carried out for 1min, the first stirring device 81 and the air pump 70 are closed, and the color developing agent can react with the anionic surfactant in the water sample to generate Methylene Blue Active Substance (MBAS) and can be extracted by chloroform.
10. Standing and layering: standing the solution for 1min, and layering the solution, wherein the upper layer is a water phase, and the lower layer is an organic phase containing methylene blue active substances.
11. And (3) detecting absorbance:
if the content of interference ions in the water sample is low, the absorbance value of the interference ions at 652nm can be directly detected and substituted into a standard working curve, and the concentration of the anionic surfactant in the water sample can be obtained;
if the content of interfering ions in the water sample is high, the external interface connected with the cleaning solution conveying pipeline 14 is controlled to be opened to enable the cleaning solution conveying pipeline to be communicated with the main pipeline, other external interfaces are kept closed, meanwhile, the E interface and the F interface of the reversing valve assembly 41 are controlled to be communicated, namely, the reversing valve assembly 41 is communicated with the external atmosphere, the drain pump 50 is in a closed state, firstly, the first quantitative pump 30, the double-optical coupling quantitative assembly 31 and the second quantitative pump 60 are used for accurately pumping 5ml of cleaning solution into the second cup body 90, the E interface and the G interface of the reversing valve assembly 41 are controlled to be communicated, the second quantitative pump 60 is used for accurately pumping 1.5ml of lower-layer organic phase in the first cup body 80 into the second cup body 90, then, the E interface and the F interface of the reversing valve assembly 41 are controlled to be communicated, air and the second quantitative pump 60 are used for pushing the lower-layer organic phase in the pipeline into the second cup body, after stirring for 1min, the second stirring device 91 is closed, and the solution is left standing for 1min, then the solution is layered, the upper layer is a water phase, and the lower layer is an organic phase containing methylene blue active substances.
And (3) opening the liquid discharge pump 50, controlling the connection between the E port and the G port of the reversing valve assembly 41, emptying residual liquid in the first cup body 80, closing the first quantitative pump 30 and the liquid discharge pump 50, accurately pumping 1.5ml of lower organic phase in the second cup body 90 into the first cup body 80 by using the second quantitative pump 60, detecting the absorbance value of the lower organic phase at 652nm, and substituting the absorbance value into a standard working curve to obtain the concentration of the anionic surfactant in the water sample.
12. Liquid drainage: the drain pump 50 is turned on to drain the apparatus and any remaining waste liquid in the pipeline.
13. Cleaning: controlling to open the external interface connected with the cleaning liquid conveying pipeline 23 to conduct with the main pipeline, keeping other external interfaces closed, extracting the cleaning liquid ethanol cleaning device and the pipeline, and emptying the cleaning liquid ethanol in the device and the pipeline; and pumping pure water in the pure water cleaning device and the pipeline, and the emptying device and the pipeline.
According to the online analyzer for the anionic surfactant, the control module can automatically control the configuration of various solutions according to a preset program, the solution can be accurately and quantitatively extracted by using the double-optical coupling quantitative component 31, the first quantitative pump 30 and the second quantitative pump 60, the steps of sample introduction, metering, reaction, extraction, washing, measurement and the like are fully automated, the online analyzer has the advantages of small sampling volume and accurate sampling, the content of the anionic surfactant in water can be automatically and quickly analyzed, and the online analyzer provides reliable guarantee for long-term accurate monitoring of the anionic surfactant in water. All the components of the invention can be fixed on the mounting plate, the device is light and handy, and can be installed in a water station to realize the online monitoring of the anionic surfactant in water quality. The uncertainty of manual operation is solved, the harm of a toxic extracting agent to experimenters and the environment is avoided, and the analysis time is shortened. In addition, reasonable and effective treatment steps can be set according to different water quality conditions, and the dosage of the toxic extracting agent is reduced.
In addition to the above-mentioned embodiments, in consideration of the specific arrangement of the reversing valve assembly 41, it is preferable that the reversing valve assembly 41 is a three-way reversing valve. In addition to the above embodiments, the line connector 40 is preferably a cross connector. The three-way reversing valve is in signal connection with the control module to control the connection of the interface E of the three-way reversing valve and the interface F or the interface G according to requirements. The cross-shaped joint mainly plays a role in connecting pipelines.
In addition to the above-mentioned embodiments, in consideration of the specific selection of the first quantitative pump 30 and the second quantitative pump 60, it is preferable that the first quantitative pump 30 and the second quantitative pump 60 are both peristaltic pumps. The peristaltic pump consists of three parts: a drive, a pump head and a hose. The fluid is isolated in the pump line, but quick replacement pump line, fluid reversible, can do the operation futilely, have maintenance cost low grade characteristics.
In addition to the above embodiments, the absorbance detection device 83 preferably includes an LED lamp light source and a photodiode. The LED light source emits 652nm monochromatic light, the ratio of the incident light intensity before passing through a water sample to be detected and the transmission light intensity after the light passes through the water sample to be detected is recorded through the control module and the photodiode, the logarithm taking 10 as the base number is used for obtaining the absorbance value, and the absorbance value is substituted into a standard working curve to obtain the concentration of the anionic surfactant in the water sample to be detected.
On the basis of the above-described embodiment, it is preferable that an inlet end of the drain pump 50 is connected to the D-port, and an outlet end of the drain pump 50 is connected to a waste liquid collection tank for collecting waste liquid, for collecting waste liquid.
On the basis of the above embodiment, as a preferred option, the sample injection module includes a first main pipeline 10, 6 first external interfaces that can be respectively controlled and conducted with the first main pipeline 10, a second main pipeline 20, and 6 second external interfaces that can be respectively controlled and conducted with the second main pipeline 20, an outlet end of the first main pipeline 10 is connected to the interface a through a pipeline, an outlet end of the second main pipeline 20 is communicated with an inlet end of the first main pipeline 10, the 6 first external interfaces are respectively connected to an extractant conveying pipeline 11, a color reagent conveying pipeline 12, a buffer solution conveying pipeline 13, a washing solution conveying pipeline 14, a standby pipeline 15, and a high-standard conveying pipeline 16, the 6 second external interfaces are respectively connected with an air conveying pipeline 21, a pure water conveying pipeline 22, a cleaning liquid conveying pipeline 23, a water sample conveying pipeline 24, a quality control sample conveying pipeline 25 and a low-standard conveying pipeline 26.
In this embodiment, with second trunk lines such as washing liquid conveying pipeline 23, pure water conveying pipeline 22, be about to washing liquid conveying pipeline 23, pure water conveying pipeline 22 etc. set up the outer end of trunk line, so, when wasing whole pipeline, can ensure that all pipelines and device homoenergetic can be washd, guarantee abluent thoroughness.
In addition to the above embodiments, it is preferable that the first cup 80 is provided with a first exhaust hole at an upper portion thereof, and the first exhaust hole is connected to the first exhaust gas treatment module 82 through a pipeline. Correspondingly, a second exhaust hole is formed in the upper portion of the second cup 90, and the second exhaust hole is connected to the second exhaust gas treatment module 92 through a pipeline. Specifically, the first exhaust treatment module 82 and the second exhaust treatment module 92 each include activated carbon.
In the embodiment, the toxic extractant chloroform is used in the detection process, and the chloroform acts on the central nervous system and has an anesthetic effect. It has irritation effect on eyes, mucosa, respiratory tract and skin, and may cause death due to excessive inhalation, and has great harm to experimenters and environment. Consequently, all increased tail gas treatment module in the side upper end of first cup 80 and second cup 90, because chloroform is volatile, utilize active carbon can effectively adsorb volatile chloroform, prevented volatilizing of chloroform in the analysis process effectively, further avoided the harm to experimenter and environment.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The on-line analyzer for anionic surfactant provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The online analyzer is characterized by comprising a pipeline joint (40), a control module, a sample introduction module, an extraction detection module, a washing module, a liquid drainage module and a reversing valve assembly (41), wherein the sample introduction module, the extraction detection module, the washing module, the liquid drainage module and the reversing valve assembly (41) are respectively connected with the control module through signals, the pipeline joint (40) comprises an interface A, an interface B, an interface C and an interface D which are communicated with each other, the reversing valve assembly (41) comprises an interface E, an interface F and an interface G, the interface F and the interface G can be respectively controlled and communicated with the interface E, the interface E is connected with the interface B through a pipeline, and the interface F;
the sample introduction module comprises a main pipeline and 12 external interfaces which can be respectively controlled and conducted with the main pipeline, and the outlet end of the main pipeline is connected to the interface A through a pipeline; a double optical coupling quantitative component (31) and a first quantitative pump (30) are connected in series on the pipeline between the main pipeline and the interface A;
the extraction detection module comprises a first cup body (80), an air pump (70), a one-way valve (71) and a first stirring device (81) arranged above the first cup body (80), the bottom of the first cup body (80) is provided with an absorbance detection device (83), the lower end opening of the first cup body (80) is connected to the G interface through a pipeline, the air outlet of the air pump (70) is connected to the air inlet of the one-way valve (71) through a pipeline, and the air outlet of the one-way valve (71) is connected to a pipeline between the first cup body (80) and the G interface through a pipeline;
the washing module comprises a second cup body (90) and a second stirring device (91) arranged above the second cup body (90), the lower end opening of the second cup body (90) is connected to the C interface through a pipeline, a second fixed displacement pump (60) is connected in series on the pipeline between the second cup body (90) and the C interface, and the second fixed displacement pump (60) is a bidirectional pump;
the liquid discharge module comprises a liquid discharge pump (50), and the liquid discharge pump (50) is connected to the D interface through a pipeline.
2. The anionic surfactant on-line analyzer of claim 1, wherein the diverter valve assembly (41) is a three-way diverter valve.
3. The anionic surfactant on-line analyzer as set forth in claim 2, wherein the pipe joint (40) is a cross joint.
4. The anionic surfactant on-line analyzer as set forth in claim 1, wherein the first quantitative pump (30) and the second quantitative pump (60) are both peristaltic pumps.
5. The anionic surfactant on-line analyzer as set forth in claim 4, wherein the absorbance detecting means (83) comprises an LED lamp light source and a photodiode.
6. The anionic surfactant on-line analyzer according to claim 5, wherein the inlet end of the drain pump (50) is connected to the D port, and the outlet end of the drain pump (50) is connected to a waste liquid collection tank for collecting waste liquid.
7. The on-line anionic surfactant analyzer according to any one of claims 1 to 6, wherein the sample injection module comprises a first main pipeline (10), 6 first external interfaces capable of being controlled to be conducted with the first main pipeline (10), a second main pipeline (20), and 6 second external interfaces capable of being controlled to be conducted with the second main pipeline (20), wherein an outlet end of the first main pipeline (10) is connected to the interface A through a pipeline, an outlet end of the second main pipeline (20) is communicated with an inlet end of the first main pipeline (10), 6 first external interfaces are respectively connected with an extraction agent conveying pipeline (11), a color reagent conveying pipeline (12), a buffer solution conveying pipeline (13), a washing solution conveying pipeline (14), a standby pipeline (15), and a high-standard conveying pipeline (16), and 6 second external interfaces are respectively connected with an air conveying pipeline (21), The pure water conveying pipeline (22), the cleaning liquid conveying pipeline (23), the water sample conveying pipeline (24), the quality control sample conveying pipeline (25) and the low-standard conveying pipeline (26) are connected.
8. The on-line anionic surfactant analyzer as set forth in claim 7, wherein the first cup (80) is provided at an upper portion thereof with a first vent hole connected to the first off-gas treatment module (82) through a pipe.
9. The on-line anionic surfactant analyzer as set forth in claim 8, wherein the second cup (90) is provided at an upper portion thereof with a second vent hole connected to the second off-gas treatment module (92) through a pipe.
10. The anionic surfactant online analyzer of claim 9, wherein the first exhaust treatment module (82) and the second exhaust treatment module (92) each comprise activated carbon.
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Application publication date: 20210604 |