CN113218904A - Sampling assembly, pH detection device and pH detection method - Google Patents

Sampling assembly, pH detection device and pH detection method Download PDF

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Publication number
CN113218904A
CN113218904A CN202110770135.6A CN202110770135A CN113218904A CN 113218904 A CN113218904 A CN 113218904A CN 202110770135 A CN202110770135 A CN 202110770135A CN 113218904 A CN113218904 A CN 113218904A
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CN
China
Prior art keywords
value
detection
acid
base indicator
sampling
Prior art date
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Pending
Application number
CN202110770135.6A
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Chinese (zh)
Inventor
李传伟
赵建军
王庆凯
袁建明
王志民
严凡涛
尹丰丰
崔岩
赵瑞
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Beijing General Research Institute of Mining and Metallurgy
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Beijing General Research Institute of Mining and Metallurgy
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Priority to CN202110770135.6A priority Critical patent/CN113218904A/en
Publication of CN113218904A publication Critical patent/CN113218904A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/10Devices for withdrawing samples in the liquid or fluent state
    • G01N1/14Suction devices, e.g. pumps; Ejector devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/34Purifying; Cleaning
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/75Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
    • G01N21/80Indicating pH value
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/10Devices for withdrawing samples in the liquid or fluent state
    • G01N1/14Suction devices, e.g. pumps; Ejector devices
    • G01N2001/1418Depression, aspiration

Abstract

The invention provides a sampling assembly, a pH detection device and a pH detection method, which relate to the technical field of pH detection, and the sampling assembly provided by the invention comprises: the device comprises a flexible filter member, a support framework, a sampling pump and a backwashing device; the flexible filter piece is surrounded to form a filter cavity, and the support framework is arranged in the filter cavity; the sampling pump and the back-flushing device are respectively communicated with the fluid of the filter cavity. According to the sampling assembly provided by the invention, the sampling pump can suck ore pulp to enter the filter cavity through the flexible filter element, and when sampling is finished, fluid can be injected into the filter cavity through the back washing device, so that the flexible filter element is washed backwards, and the technical problem that calcium is formed or scales are formed on the outer surface of the flexible filter element is solved. The pH detection method provided by the invention can realize online high-precision detection of the pH value of the ore pulp by utilizing photometric analysis, improves the detection precision and the detection stability compared with an electrode method, and can realize online detection of the pH value in ore dressing operation.

Description

Sampling assembly, pH detection device and pH detection method
Technical Field
The invention relates to the technical field of pH detection, in particular to a sampling assembly, a pH detection device and a pH detection method.
Background
In the mineral processing process, particularly in the mineral processing industrial production, the pH value of ore pulp is an important factor influencing mineral processing indexes. The electrode method for measuring the pH value is the most common on-line measuring method in the current mineral separation production, but cannot realize continuous high-precision measurement and automatic control of the pH value of the ore pulp. In the process of detecting the pH value of the ore pulp, the ore pulp is easy to form calcium or scale, which affects the ion exchange of the electrode permeable membrane, causes the precision of the electrode to be poor, and needs to be cleaned and calibrated frequently. Various medicaments are required to be added in the production to clean the electrode, so that the electrode aging is accelerated.
Disclosure of Invention
The invention aims to provide a sampling assembly, a pH detection device and a pH detection method, which are used for relieving the technical problems of calcium formation and scaling during ore pulp sampling.
In a first aspect, the present invention provides a sampling assembly comprising: the device comprises a flexible filter member, a support framework, a sampling pump and a backwashing device;
the flexible filter piece is surrounded to form a filter cavity, and the support framework is arranged in the filter cavity;
the sampling pump and the backwashing device are respectively communicated with the fluid of the filter cavity.
With reference to the first aspect, the present disclosure provides a first possible implementation manner of the first aspect, wherein a bending portion is disposed on an outer surface of the support framework;
in a sampling and filtering state, the flexible filter element is attached to the outer surface of the support framework;
in a back-flushing state, the flexible filter elements form a back-flushing chamber between the outer surfaces of the support framework.
With reference to the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the backwashing device includes: a first gas supply device and a second gas supply device;
the first gas supply device is communicated with the filter cavity;
the second gas supply means is in fluid communication with the outlet of the sampling pump.
In a second aspect, the present invention provides a pH detection apparatus, comprising: a sample container, a cuvette, an indicator addition device, a photometric value detection device and the sampling assembly of the first aspect;
the outlet of the sampling pump is in fluid communication with the sample container, and the sample container and the indicator adding device are in fluid communication with the cuvette respectively;
and the photometric value detection device is used for detecting the absorbance value of the liquid in the cuvette.
With reference to the second aspect, the present invention provides a first possible implementation manner of the second aspect, wherein the photometric value detection device includes: an excitation light source and a detector;
and the light beam emitted by the excitation light source is transmitted to the detector after penetrating through the liquid in the cuvette.
In combination with the second aspect, the present disclosure provides a second possible implementation manner of the second aspect, wherein the pH detection apparatus further includes an agitator for agitating the reagent in the cuvette.
In combination with the second aspect, the present disclosure provides a third possible embodiment of the second aspect, wherein the pH detection apparatus further includes a water supply device, and the water supply device is in fluid communication with the cuvette.
In combination with the second aspect, the present invention provides a fourth possible implementation manner of the second aspect, wherein a liquid level detector is arranged in the sample container.
In a third aspect, the present invention provides a method for detecting pH, comprising the steps of:
establishing a multi-stage regression model of the absorbance value of the reagent after the acid-base indicator is added into the standard solution, the addition amount of the acid-base indicator and the pH value of the standard solution;
detecting the absorbance value of a sample to be detected after an acid-base indicator is added, and gradually increasing the addition amount of the acid-base indicator until the addition amount of the acid-base indicator and the corresponding absorbance value accord with the multi-section regression model;
and substituting the addition amount of the acid-base indicator and the absorbance value into the multistage regression model, and calculating the pH value of the sample to be detected.
With reference to the third aspect, the step of establishing a multi-stage regression model of the absorbance value of the reagent after the acid-base indicator is added to the standard solution, the addition amount of the acid-base indicator, and the pH value of the standard solution includes:
selecting the acid-base indicator with the color changing along with the pH value within the range of the pH value range to be measured;
selecting a plurality of standard solutions, and enabling the pH values of the plurality of standard solutions to be gradually increased in a gradient manner within the range of the pH value to be detected;
adding the acid-base indicator into a standard solution, and detecting the absorbance value of a reagent obtained after the standard solution and the acid-base indicator are mixed;
and establishing a corresponding relation among the addition amount of the acid-base indicator, the pH value of the standard solution and the absorbance value of the mixed reagent.
The embodiment of the invention has the following beneficial effects: adopt flexible filter piece to enclose to establish and form the filter chamber, the support chassis is installed in the filter chamber, sampling pump and back flush device respectively with filter chamber fluid intercommunication, can suction the ore pulp through the flexible filter piece entering filter chamber through the sampling pump, when the sample was accomplished, accessible back flush device is to the filter intracavity injection fluid, and then the back flush flexible filter piece, and then avoid the surface of flexible filter piece to produce the technical problem of calcium deposition or scale deposit.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a pH detection apparatus provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a sampling assembly in a sampling and filtering state according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a sampling assembly provided in accordance with an embodiment of the present invention in a backwash state;
fig. 4 is a schematic diagram of a sampling assembly according to an embodiment of the present invention.
Icon: 001-a flexible filter; 101-a filter chamber; 102-a backwash chamber; 111-a clamp; 002-supporting a framework; 201-a bending part; 003-sampling pump; 004-backwashing devices; 401-first gas supply means; 402-second gas supply means; 005-sample container; 501-liquid level detector; 502-an evacuation valve; 503-peristaltic pump; 006-cuvette; 601-a drain pump; 007-indicator addition device; 008-a photometric quantity detecting device; 801-excitation light source; 802-a probe; 009-stirrer; 010-water supply means.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, a sampling assembly according to an embodiment of the present invention includes: a flexible filter element 001, a supporting framework 002, a sampling pump 003 and a backwashing device 004; the flexible filter piece 001 is arranged in an enclosing manner to form a filter cavity 101, and the support framework 002 is arranged in the filter cavity 101; sample pump 003 and backwash device 004 are each in fluid communication with filter cavity 101.
During sampling, slurry can be pumped by the sampling pump 003 to enter the filter cavity 101 through the flexible filter element 001, and the slurry entering the filter cavity 101 can flow along the pipeline and be collected. When the sampling is completed, the fluid can be injected into the filter cavity 101 through the back washing device 004, and the fluid reversely impacts the flexible filter element 001 in the process, so that the material attached to the outer surface of the flexible filter element 001 can be removed, and the technical problem of calcium deposition or scaling on a sampling assembly is avoided.
In the embodiment of the present invention, the outer surface of the supporting skeleton 002 is provided with a bending portion 201;
in the sampling and filtering state, the flexible filter piece 001 is attached to the outer surface of the support framework 002;
in the backwash state, flexible filter element 001 forms backwash chamber 102 between the outer surfaces of support framework 002.
When sampling assembly switched to the back flush state from the sample filtration state, flexible filtering piece 001 expanded in the surface of supporting framework 002 outwards from laminating to, flexible filtering piece 001 separates with the surface of supporting framework 002 gradually, and flexible filtering piece 001 produces the deformation at this in-process, and then helps making knot calcium and the scale deposit attached to on flexible filtering piece 001 drop.
As shown in fig. 2, 3 and 4, the flexible filter member 001 comprises a filter cloth, the thickness and knitting density of which are selected according to the size distribution of the ore slurry; the supporting framework 002 is made of stainless steel, the outer part of the supporting framework 002 is arranged into a star-shaped structure, and the inner part of the supporting framework 002 is hollow. The flexible filtration piece 001 encloses the outside of establishing at support skeleton 002, and the both ends of flexible filtration piece 001 are fixed on support skeleton 002 through clamp 111 respectively.
As shown in fig. 1, the backwashing device 004 includes: a first gas supply means 401 and a second gas supply means 402; the first air supply device 401 is communicated with the filter cavity 101; second gas supply means 402 is in fluid communication with the outlet of sampling pump 003.
Specifically, the first gas supply device 401 and the second gas supply device 402 respectively include high-pressure gas sources, and the first gas supply device 401 and the second gas supply device 402 respectively adopt solenoid valves to control the on/off of the gas paths. High-pressure gas can be injected into the filter cavity 101 through the first gas supply device 401, so that the flexible filter piece 001 and the support framework 002 can be flushed. The sampling line from the sampling pump 003 to the flexible filter 001 can be flushed through the second gas supply means 402.
Example two
As shown in fig. 1, a pH detection apparatus provided in an embodiment of the present invention includes: the sample container 005, the cuvette 006, the indicator adding device 007, the photometric value detection device 008 and the sampling assembly provided in the first embodiment;
the outlet of the sampling pump 003 is in fluid communication with the sample container 005, and the sample container 005 and the indicator adding device 007 are in fluid communication with the cuvette 006, respectively;
the photometric value detecting device 008 is used to detect the absorbance value of the liquid in the cuvette 006.
Specifically, sample container 005 is used for collecting the ore pulp sample that the sampling subassembly gathered, and indicator interpolation device 007 is arranged in letting in the acid-base indicator to cell 006, and the acid-base indicator is organic weak acid or organic weak base, and conjugate acid-base in the indicator is to leading to the structure difference because acid-base balance moves, and then has different colours. When the pH value of the solution changes, the balance of the conjugate acid-base pair changes, the color of the solution changes, and the color change amplitude has a specific relation with the change of the H + and OH-ion concentration in the solution, namely the specific relation with the pH value of the solution. The color change can be characterized by the absorbance of the solution to monochromatic light with a specific wavelength, so that the absorbance of the solution caused by adding the indicator has a specific relation with the pH value of the solution. And (3) carrying out absorbance detection by adopting a plurality of groups of solutions with known pH values, establishing a regression model of the absorbance and the pH value by utilizing the test data, and solving the pH value of the unknown solution according to the absorbance of the unknown solution through the regression model. The pH detection device provided by the embodiment can improve the reliability of pH on-line detection, reduces the workload of equipment maintenance, and can be used for realizing the closed-loop optimization control of the pH value in the mineral separation process.
It should be noted that a peristaltic pump 503 is disposed in a pipeline between the sample container 005 and the cuvette 006, and the sample liquid in the sample container 005 can be accurately controlled to be injected into the cuvette 006 through the peristaltic pump 503. The drain pipe of the sample container 005 is provided with an evacuation valve 502, and when the sampling test is finished, the evacuation valve 502 is opened to evacuate the sample container 005.
In the practice of the inventionIn an example, the photometric value detecting device 008 includes: an excitation light source 801 and a detector 802; the light beam emitted from the excitation light source 801 is transmitted to the detector 802 through the liquid in the cuvette 006. The excitation source 801 is a monochromatic light source, and the wavelength of the monochromatic light source can be selected according to the maximum absorption wavelength of the indicator. After the cell 006 loads the pulp filtrate, the absorption intensity of the detector 802 is recorded, and the average value I of the intensity in a certain time is calculated by adopting a filtering algorithm0. Dosing V by means of a syringe pump of the indicator addition device 0071Indicator of volume is added into the cuvette 006, after the indicator is fully mixed with the ore pulp sample, the average value of light intensity I after the indicator is added is detected by the photometric value detection device 0081And calculating an absorbance value A, wherein A = -log10 (I)1/I0)。
Then, it is judged whether the absorbance value A is at V1Substituting the volume indicator into a regression model for calculation if the volume indicator is in the regression model range corresponding to the volume indicator; otherwise, the indicator is added again to the cuvette 006 by the indicator adding device 007, and the amount of the indicator added reaches V1Volume. And by analogy, until the calculated absorbance value A falls within the range of the regression model, the pH value of the sample to be detected can be obtained by substituting the calculated absorbance value A into the regression model.
Further, the pH detecting apparatus further includes a stirrer 009, and the stirrer 009 is used to stir the reagents in the cuvette 006. Wherein, agitator 009 adopts oscillating agitator or magnetic stirrer, and cell 006 is placed on agitator 009, and the stirring through agitator 009 can make the ore pulp sample in cell 006 fully mix with the indicator.
Further, the pH detection apparatus further includes a water supply device 010, and the water supply device 010 is in fluid communication with the cuvette 006. The water supply device 010 adopts tap water as a water source, and drives water to flow into the cuvette 006 through a liquid pump, and the cuvette 006 can be washed by clear water when detection is completed. The liquid in the cuvette 006 can be drained from a drain line at the bottom of the cuvette 006 by a drain pump 601.
Specifically, be equipped with level detector 501 in the sample container 005, sample container 005 can adopt organic glass to make, and level detector 501 includes tuning fork type level gauge, detects the inside liquid level of sample container 005 through level detector 501, and sample pump 003 closes when the sample reaches preset quantity.
EXAMPLE III
As shown in fig. 1, the pH detection method provided in the embodiment of the present invention adopts the above pH detection apparatus, and includes the following steps: establishing a multi-stage regression model of the absorbance value of the reagent after the acid-base indicator is added into the standard solution, the addition amount of the acid-base indicator and the pH value of the standard solution; detecting the absorbance value of a sample to be detected after adding the acid-base indicator, and gradually increasing the addition amount of the acid-base indicator until the addition amount of the acid-base indicator and the corresponding absorbance value accord with a multi-section regression model; and substituting the addition amount and the absorbance value of the acid-base indicator into a multistage regression model, and calculating the pH value of the sample to be detected.
In this embodiment, a multi-stage regression model of pH values and absorbance values is established by using a standard solution with a known pH value and an acid-base indicator, and since the difference of the color reaction is an exponential change with a base of 10 after reagents with different pH values are added to the indicator, and the absorbance calculation is preferably within a certain range, the amount of the indicator to be added at different pH values is different, and a model needs to be established separately in each pH value range. Buffer solutions with different pH values are prepared, and an absorbance and pH value section model is established according to the absorbance condition. According to the absorbance difference of the to-be-detected liquid with different pH values, the adding amount of the indicator is automatically selected, and the indicator is substituted into different regression models to calculate the pH value of the to-be-detected liquid according to different adding amounts of the indicator, so that the measurement precision is high, and frequent calibration is not needed.
The step of establishing a multistage regression model of the absorbance value of the reagent after the acid-base indicator is added to the standard solution, the addition amount of the acid-base indicator, and the pH value of the standard solution includes: selecting an acid-base indicator with the color changing along with the pH value within the range of the pH value range to be measured; selecting a plurality of standard solutions, and enabling the pH values of the plurality of standard solutions to be gradually increased in a gradient manner within the range of the pH value to be detected; adding an acid-base indicator into the standard solution, and detecting the absorbance value of a reagent obtained after the standard solution and the acid-base indicator are mixed; and establishing a corresponding relation among the addition amount of the acid-base indicator, the pH value of the standard solution and the absorbance value of the mixed reagent. Within a certain range, the pH value of the reagent, the addition amount of the acid-base indicator and the absorbance value have correlation, the pH value of the liquid to be tested can be solved according to the established multi-section regression model and by combining the amount of the acid-base indicator added into the liquid to be tested and the corresponding absorbance value, and frequent calibration is not needed in the testing process.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A sampling assembly, comprising: the device comprises a flexible filter piece (001), a supporting framework (002), a sampling pump (003) and a backwashing device (004);
the flexible filter piece (001) is arranged in an enclosing mode to form a filter cavity (101), and the supporting framework (002) is installed in the filter cavity (101);
the sampling pump (003) and the backwash device (004) are respectively in fluid communication with the filtration chamber (101).
2. The sampling assembly according to claim 1, characterized in that the outer surface of the support skeleton (002) is provided with a bend (201);
in a sampling and filtering state, the flexible filter element (001) is attached to the outer surface of the support framework (002);
in a back-flushing state, the flexible filter element (001) forms a back-flushing chamber (102) between the outer surfaces of the support framework (002).
3. The sampling assembly according to claim 1, characterized in that the backflushing means (004) comprise: a first gas supply means (401) and a second gas supply means (402);
the first gas supply device (401) is communicated with the filter cavity (101);
the second gas supply means (402) is in fluid communication with an outlet of the sampling pump (003).
4. A pH detection device, comprising: a sample container (005), a cuvette (006), an indicator addition device (007), a photometric detection device (008) and a sampling assembly according to any one of claims 1 to 3;
the outlet of the sampling pump (003) is in fluid communication with the sample container (005), the sample container (005) and the indicator addition device (007) are in fluid communication with the cuvette (006), respectively;
the photometric quantity detection device (008) is used for detecting the absorbance value of the liquid in the cuvette (006).
5. The pH detection apparatus according to claim 4, wherein the photometric value detection device (008) includes: an excitation light source (801) and a detector (802);
the light beam emitted by the excitation light source (801) penetrates through the liquid in the cuvette (006) and then is transmitted to the detector (802).
6. The pH detecting apparatus according to claim 4, further comprising an agitator (009), wherein the agitator (009) is used to agitate the reagents in the cuvette (006).
7. The pH detection apparatus according to claim 4, further comprising a water supply device (010), wherein the water supply device (010) is in fluid communication with the cuvette (006).
8. The pH detecting device according to claim 4, wherein a liquid level detector (501) is provided in the sample container (005).
9. A pH detection method, comprising the steps of:
establishing a multi-stage regression model of the absorbance value of the reagent after the acid-base indicator is added into the standard solution, the addition amount of the acid-base indicator and the pH value of the standard solution;
detecting the absorbance value of a sample to be detected after an acid-base indicator is added, and gradually increasing the addition amount of the acid-base indicator until the addition amount of the acid-base indicator and the corresponding absorbance value accord with the multi-section regression model;
and substituting the addition amount of the acid-base indicator and the absorbance value into the multistage regression model, and calculating the pH value of the sample to be detected.
10. The method for detecting pH according to claim 9, wherein the step of establishing a multi-stage regression model of the absorbance value of the reagent after the acid-base indicator is added to the standard solution, the addition amount of the acid-base indicator, and the pH value of the standard solution comprises:
selecting the acid-base indicator with the color changing along with the pH value within the range of the pH value range to be measured;
selecting a plurality of standard solutions, and enabling the pH values of the plurality of standard solutions to be gradually increased in a gradient manner within the range of the pH value to be detected;
adding the acid-base indicator into a standard solution, and detecting the absorbance value of a reagent obtained after the standard solution and the acid-base indicator are mixed;
and establishing a corresponding relation among the addition amount of the acid-base indicator, the pH value of the standard solution and the absorbance value of the mixed reagent.
CN202110770135.6A 2021-07-08 2021-07-08 Sampling assembly, pH detection device and pH detection method Pending CN113218904A (en)

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