CN113820306A

CN113820306A - Water quality detection analyzer and detection method

Info

Publication number: CN113820306A
Application number: CN202111207790.7A
Authority: CN
Inventors: 王奎子; 郝代旭; 赵青; 王烁
Original assignee: Jilin Tstcheck Biological Electronic Engineering Co ltd
Current assignee: Jilin Tstcheck Biological Electronic Engineering Co ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2021-12-21

Abstract

A water quality detection analyzer and a detection method, the analyzer comprises an instrument main body, a light source, a color acquisition module, a power supply module and a control unit, wherein the light source, the color acquisition module, the power supply module and the control unit are arranged in the instrument main body; the instrument main body is provided with a display screen and an operation key, a measuring chamber for accommodating a measuring bottle is processed, and one end close to the measuring chamber is also provided with a shading cover; the light source is arranged on one side of the measuring chamber and is used for irradiating the water sample in the measuring bottle in the measuring chamber; the color acquisition module is arranged on the other side of the measurement chamber and used for acquiring the color of the water sample in the measurement bottle and sending the acquired data to the control unit; the power supply module is used for supplying power; the control unit is used for calculating the content of a certain chemical component or a certain specific chemical component or mineral ion component in the water sample according to the RGB value of the reacted water sample color. This analysis appearance simple structure, convenient to use has solved that the quality of water measuring result error of visual observation is big, easily receives external disturbance, complex operation's technical problem.

Description

Water quality detection analyzer and detection method

Technical Field

The invention belongs to the technical field of water quality analysis and detection, and particularly relates to a water quality detection analyzer and a detection method.

Background

The existing market has more equipment for water quality analysis, but the adopted analysis method mainly comprises an electrode method and a colorimetric method; wherein, the electrode method is mainly used for measuring TDS (total dissolved solids) in water; colorimetric methods are often used to determine the content of one or a particular class of chemical or mineral ionic components in water, such as total chlorine, residual chlorine, total alkalinity, total hardness, and the like.

Two types of colorimetric methods are commonly used: visual colorimetry and photoelectric colorimetry. The visual colorimetry is mainly observed by eyes, the object of the colorimetry can be a liquid reagent which completely reacts and can also be a test strip after the reaction is finished, and the method for testing the water quality by using the test strip is portable and visual, is less influenced by the temperature of the external environment, and is the most common detection method at present. However, when the color of the test strip after reaction or the liquid reagent which completely reacts is judged by adopting a visual observation method, a large error is easy to generate, whether the test strip reaches the optimal reaction time is difficult to determine, and the operation difficulty is increased by outdoor operation. The photoelectric colorimeter mainly uses a photoelectric colorimeter for measurement, the photoelectric colorimeter eliminates subjective errors of a visual colorimeter and improves the measurement accuracy, but the photoelectric colorimeter adopts a tungsten lamp light source and an optical filter, is only suitable for a visible spectrum region and can only obtain composite light in a certain wavelength range, and has certain limitations. Therefore, it is necessary to develop a water quality detection analyzer which can not only solve the problem of large error of the visual colorimetry, but also solve the problem of limited detection range of the photoelectric colorimetry.

Disclosure of Invention

The invention aims to provide a water quality detection analyzer, which calculates the content of a certain chemical component or a certain specific chemical component or mineral ion component in a water sample by RGB (red, green and blue) values of the color of the water sample to be detected after reaction through the color of a reagent on a detection test paper and the water sample to be detected after reaction.

In order to achieve the purpose, the invention adopts the following technical scheme:

a water quality detection analyzer comprises an instrument main body, a light source, a color acquisition module, a power supply module and a control unit, wherein the light source, the color acquisition module, the power supply module and the control unit are arranged in the instrument main body; the instrument main body is provided with a measuring chamber for accommodating a measuring bottle, one end of the instrument main body close to the measuring chamber is also provided with a shading cover, and the shading cover is used for covering the measuring chamber to completely shade the measuring chamber; the instrument main body is also provided with a display screen installation part and an operation key installation part, the display screen installation part is provided with a display screen, and the operation key installation part is provided with an operation key; the light source is arranged on one side of the measuring chamber and is used for irradiating the water sample to be measured in the measuring bottle in the measuring chamber; the color acquisition module is arranged on the other side of the measurement chamber and is used for acquiring the color of the water sample to be measured in the measurement bottle and sending the acquired data to the control unit; the power supply module is used for supplying power; and the control unit is used for calculating the content of a certain chemical component or a certain specific chemical component or mineral substance ion component in the water sample according to the RGB value of the color of the water sample to be detected after reaction.

Preferably, the instrument main body is further provided with a USB data interface and a program downloading interface.

Preferably, the light source is an ultra-high brightness white light LED light source, the measuring bottle is a transparent glass bottle with a neat surface and no scratch, and a bottle cap is arranged on the measuring bottle; the display screen adopts an LCD display screen; the operation keys comprise a soft on-off key, a zero calibration key, a detection item selection key and a detection key.

Preferably, a hinge seat is arranged at one end of the instrument body close to the measuring chamber, and the shading cover is hinged with the hinge seat.

Preferably, the control unit comprises a controller, a memory; the controller is an ARM microcontroller GD32F103CBT6, a PB12 pin, a PB13 pin and a PB15 pin of the ARM microcontroller are respectively connected with 1 pin, 2 pin and 3 pin of a DA output module, 6 pins of the DA output module are connected with an automatic light tracing module, and the automatic light tracing module is connected with a light source and used for adjusting the light source to a set brightness before detection starts, namely performing zero calibration processing; a PB6 pin and a PB7 pin of the ARM microcontroller are connected with the color acquisition interface and connected with the color acquisition module through the color acquisition interface; a PA0-WAKEUP pin of the ARM microcontroller is connected with the power supply module, and a PA2 pin and a PA3 pin of the ARM microcontroller are connected with the USB data interface; a PA13 pin and a PA14 pin of the ARM microcontroller are connected with a program downloading interface; a PB8 pin and a PB9 pin of the ARM microcontroller are connected with a soft on-off module, and the soft on-off module is connected with a soft on-off button; and a PA5 pin, a PA7 pin, a PB0 pin, a PB1 pin and a PB10 pin of the ARM microcontroller are connected with the LCD screen.

Preferably, the memory stores standard solutions with different concentrations and standard curves of RGB values for each detection item, the controller calculates the RGB values of the colors of the water sample to be detected after the reaction according to the color acquisition module, and then calculates the content of a specific chemical component or a specific class of chemical components or mineral ion components in the water sample according to the standard curves of the standard solutions with different concentrations and the RGB values in the memory.

Another object of the present invention is to provide a method for detecting water quality by using the above water quality detection analyzer, which comprises the following steps:

step S1, respectively configuring at least 3 different-concentration 3ml standard solutions for each detection item, wherein the color of the at least 3 different-concentration standard solutions becomes a gradually-graded standard color level after the reaction with the reagent on the detection test paper; and the standard solution contains the lowest concentration and the highest concentration of the detected substance;

step S2, in a light-proof environment with set light source brightness, detecting the colors of the standard solutions with different concentrations after reaction by adopting a color acquisition module respectively, and determining the RGB values of the standard solutions with different concentrations; then selecting a single channel R value or G value or B value which can show color change most from the RGB values, and then respectively bringing the single channel value and the concentration of the standard solutions with two adjacent concentrations into a linear mode Y ═ a + bX, thereby obtaining at least two sections of linear equations;

step S3, storing the multiple linear equations obtained in step S2 and the maximum single channel value and the minimum single channel value corresponding to each linear equation in a memory of the analyzer according to the detection item types;

step S4, when a water sample to be detected needs to be detected, firstly, a soft on-off button is pressed to start the water sample;

step S5, adding 3ml of water sample to be measured into a measuring bottle by using an injector, and screwing a bottle cap;

step S6, opening a shading cover, putting the measuring bottle filled with the water sample to be measured into a measuring chamber, and closing the shading cover;

step S7, pressing a zero calibration key, adjusting the light source to the set brightness by the automatic light tracking module, and executing step S8 after zero calibration is finished;

step S8, pressing a detection item selection key to adjust the test type to the item to be detected;

step S9, opening the shading cover, taking out the measuring bottle, opening the bottle cover, taking out the test paper corresponding to the detection item, inserting one end of the test paper into the measuring bottle, clamping the other end of the test paper by using the bottle cover and screwing the bottle cover;

s10, reversing the upper part and the lower part to enable the reagent on the test paper to completely react with the water sample to be detected, opening the bottle cap, taking out the test paper, and screwing the bottle cap again;

and S11, putting the measuring bottle into the measuring chamber again, closing the shading cover, pressing the detection key, collecting the color of the water sample to be measured after reaction by the color collection module, sending the color to the control unit, determining the RGB value by the control unit according to the color, selecting the single channel value which can show the color change most, and then selecting a linear equation according to the value, thereby calculating the content of a specific chemical component or mineral ion component in the water sample, and displaying the value on the display screen.

Preferably, step S10 is reversed up and down 20 times; when the measuring bottle is placed into the measuring chamber again in the step S11, the surface of the measuring bottle is ensured to be clean and free of scratches, fingerprints and water drops.

The invention has the advantages and beneficial effects that:

(1) the water quality detection analyzer provided by the invention has the advantages of small and simple structure, convenience in use and low cost, the analyzer absorbs a water sample to be detected by using the injector and puts the water sample into the measuring bottle, then the matched detection test paper is inserted into the measuring bottle, the reagent on the test paper reacts with the substance to be detected in the water sample, so that the water sample displays different colors, then the ultrahigh-brightness white-light LED light source is used for irradiating the water sample, the color of the water sample is detected by the color acquisition module, and the RGB value of the color of the water sample to be detected after reaction is used for calculating the content of a certain chemical component or a certain specific mineral ion component in the water sample, so that the detection result is accurate and reliable, and the technical problems of large error, easy external interference, complicated operation and the like of the water quality detection result observed by naked eyes are solved; and simultaneously, the problem of limitation of a photoelectric colorimetric method is also solved.

(2) The reagent on the test paper reacts with the substance to be detected in the water sample, the reagent can fully react with the water sample in a short time, the completion condition of the reaction can be controlled by controlling the up-down reversal times, and the detection process is further simplified.

(3) The measuring bottle used in the detection is arranged in the light-proof measuring chamber, and the light source needs to be adjusted to the set brightness in advance in the actual detection, so that the influence of ambient light on the color can be avoided, the accuracy of color acquisition by the color acquisition module is ensured, and the stability and the accuracy of the measuring result can be further improved.

Drawings

FIG. 1 is one of the isometric views of the body of the water quality testing analyzer of the present invention;

FIG. 2 is a second perspective view of the main body of the water quality analyzer of the present invention;

FIG. 3 is a third perspective view of the main body of the water quality analyzer of the present invention;

FIG. 4 is a schematic block diagram of the electrical connections of the components of the water quality analyzer of the present invention;

FIG. 5 is a circuit diagram of the controller of the present invention;

FIG. 6 is a circuit diagram of the automatic light tracking module of the present invention;

FIG. 7 is a circuit diagram of the USB data interface of the present invention;

FIG. 8 is a circuit diagram of the power module of the present invention;

FIG. 9 is a circuit diagram of the program download interface of the present invention;

FIG. 10 is a circuit diagram of an LCD display screen according to the present invention;

FIG. 11 is a circuit diagram of a color acquisition module of the present invention;

FIG. 12 is a circuit diagram of the DA output module of the present invention;

FIG. 13 is a circuit diagram of the soft switching power module of the present invention;

FIG. 14 is a graph showing the results of pH detection according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

In the description of the present application, it should be noted that the terms "in", "under", and the like indicate the orientation or positional relationship: the particular arrangements or components shown in the drawings, or the orientations or positional relationships conventionally used in the manufacture of the applications, are for convenience only and to simplify the description, and are not intended to indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and are not to be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1

Referring to fig. 1 to 3, the water quality detecting analyzer provided by the present invention includes an instrument main body 1, and a light source 2, a color collecting module 3, a power supply module 4 and a control unit installed inside the instrument main body; a measuring chamber 101 for accommodating a measuring bottle is processed on the instrument main body 1, a hinge base 104 is further arranged at one end of the instrument main body 1 close to the measuring chamber 101, a light shielding cover (not shown) is mounted on the hinge base, and the light shielding cover is hinged to the hinge base 104 and used for covering the measuring chamber on the cover 101 so as to completely shield the measuring chamber from light; the instrument main body 1 is also provided with a display screen mounting part 102 and an operation key mounting part 103, wherein a display screen is mounted on the display screen mounting part 102, and an operation key is mounted on the operation key mounting part 103; the light source 2 is arranged on one side of the measuring chamber 101 and is used for irradiating the water sample to be measured in the measuring bottle in the measuring chamber 101; the color acquisition module 3 is arranged at the other side of the measuring chamber and is used for acquiring the color of the water sample to be measured in the measuring bottle and sending the acquired data to the control unit; the power supply module 4 is used for supplying power; and the control unit is used for calculating the content of a certain chemical component or a certain specific chemical component or mineral substance ion component in the water sample according to the RGB value of the color of the water sample to be detected after reaction.

Further, the instrument main body is also provided with a USB data interface and a program downloading interface; the light source 2 adopts an ultrahigh brightness white light LED light source, the measuring bottle is a glass bottle with a neat surface, no scratch and light transmission, and a bottle cap is arranged on the measuring bottle; the display screen adopts an LCD display screen; the operation keys comprise a soft on-off key, a zero calibration key, a detection item selection key and a detection key; the soft on-off key and the zero calibration key are integrated on one operation key, and long pressing represents on-off and short pressing represents zero calibration.

Referring to fig. 4 to 13, the control unit includes a controller 5, a memory 6; the controller is an ARM microcontroller GD32F103CBT6, a PB12 pin, a PB13 pin and a PB15 pin of the ARM microcontroller are respectively connected with

pins

1, 2 and 3 of a DA output module 7, a pin 6 of the DA output module 7 is connected with an automatic light following module 8, and the automatic light following module 8 is connected with a light source 2 and used for adjusting the light source to a set brightness before detection starts, namely performing zero calibration processing; a PB6 pin and a PB7 pin of the ARM microcontroller are connected with the color acquisition interface and connected with the color acquisition module 3 through the color acquisition interface; a PA0-WAKEUP pin of the ARM microcontroller is connected with the power supply module 4, and a PA2 pin and a PA3 pin of the ARM microcontroller are connected with the USB data interface; a PA13 pin and a PA14 pin of the ARM microcontroller are connected with a program downloading interface; a PB8 pin and a PB9 pin of the ARM microcontroller are connected with a soft on-off module 9, and the soft on-off module is connected with an operation key 11; the PA5 pin, the PA7 pin, the PB0 pin, the PB1 pin and the PB10 pin of the ARM microcontroller are connected with the LCD display screen 10;

the storage is internally stored with standard curves of standard solutions with different concentrations and RGB values aiming at each detection item, the controller calculates the RGB value of the color of the water sample to be detected after reaction according to the color acquisition module, and then calculates the content of a certain chemical component or a certain specific chemical component or mineral ion component in the water sample according to a linear equation of the standard solutions with different concentrations and the RGB values in the storage.

Example 2

The method for detecting the water quality by adopting the water quality detection analyzer comprises the following steps:

step S1, respectively configuring 4 standard solutions with different concentrations for each detection item, wherein the color of the 4 standard solutions with different concentrations after reaction with the reagent on the detection test paper becomes a gradually-graded standard color gradation; and the standard solution contains the lowest concentration and the highest concentration of the detected substance;

for example: and during PH detection, a linear function is made according to the R values read by standard solutions with different concentrations. The concentration values of the standard solution are C1, C2, C3 and C4, and the read R channel values are as follows: r1, R2, R3, R4; bringing (R1, C1) and (R2, C2) into a linear mode Y ═ a + bX, resulting in parameter values for a1, b1, i.e. the first linear equation is Y ═ a1+ b 1X; similarly, (R2, C2) and (R3, C3) are put into a linear mode, Y ═ a + bX, to obtain a second segment of function parameters a2, b2, that is, the second segment of linear equation is Y ═ a2+ b 2X; bringing (R3, C3) and (R4, C4) into a linear mode Y ═ a + bX, resulting in third segment function parameters a3, b 3; that is, the third linear equation is Y-a 3+ b 3X.

Need to explain: the test conditions of the standard solution are consistent with the detection conditions of the actual water sample.

step S4, when a water sample to be detected needs to be detected, the analyzer is placed on a horizontal plane, does not need to be held by hand or shaken, and is started by pressing a soft power on/off button;

step S6, opening a shading cover, putting a measuring bottle filled with water samples to be measured (swimming pool water, fish tank water, SPA water, drinking water and the like) into a measuring chamber, and closing the shading cover;

step S8, pressing a detection item selection key to adjust the test type to the item to be detected; detecting the pH value at this time, so that the test type is adjusted to be PH;

step S9, opening the shading cover, taking out the measuring bottle, opening the bottle cover, taking a piece of PH test paper from the aluminum foil bag, inserting one end of the test paper into the measuring bottle, clamping the other end of the test paper by the bottle cover and screwing the bottle cover;

step S10, reversing the pH test paper up and down for 20 times to enable the reagent on the pH test paper to completely react with the water sample to be tested, opening the bottle cap, taking out the test paper, and screwing the bottle cap again; if liquid overflows or splashes, the liquid needs to be wiped immediately, so that the surface of the measuring bottle is ensured to be clean and tidy without scratches, fingerprints, water drops and the like;

step S11, the measuring bottle is put into the measuring chamber again, the shading cover is closed, after the detection button is pressed, the color collection module collects the color of the water sample to be detected after reaction and sends the color to the control unit, the control unit determines RGB value according to the color, simultaneously selecting the single channel R value which can most indicate the color change, then selecting a linear equation according to the value, if the measured value R is between R1 and R2, the concentration value is calculated and displayed on the display screen by using the first linear equation Y, namely a1+ b1X formula, if the measured value R is between R2 and R3, then a second linear equation Y, a2+ b2X formula, is used to calculate the concentration value and display it on the display screen, if the measured value R is between R3 and R4, the concentration value is calculated and displayed on the display screen using the third linear equation, Y, a3+ b3X (fig. 14 is the result of testing PH of drinking water).

Example 3

When free residual chlorine in a water sample needs to be tested, the specific steps refer to example 2, and the differences are as follows: step S8, pressing the detection item selection key to adjust the test type to 'FCL'; in step S9, a piece of residual chlorine test paper is taken from the aluminum foil bag.

Claims

1. A water quality detection analyzer is characterized by comprising an instrument main body, a light source, a color acquisition module, a power supply module and a control unit, wherein the light source, the color acquisition module, the power supply module and the control unit are arranged in the instrument main body; the instrument main body is provided with a measuring chamber for accommodating a measuring bottle, one end of the instrument main body close to the measuring chamber is also provided with a shading cover, and the shading cover is used for covering the measuring chamber to completely shade the measuring chamber; the instrument main body is also provided with a display screen installation part and an operation key installation part, the display screen installation part is provided with a display screen, and the operation key installation part is provided with an operation key; the light source is arranged on one side of the measuring chamber and is used for irradiating the water sample to be measured in the measuring bottle in the measuring chamber; the color acquisition module is arranged on the other side of the measurement chamber and is used for acquiring the color of the water sample to be measured in the measurement bottle and sending the acquired data to the control unit; the power supply module is used for supplying power; and the control unit is used for calculating the content of a certain chemical component or a certain specific chemical component or mineral substance ion component in the water sample according to the RGB value of the color of the water sample to be detected after reaction.

2. The water quality detecting analyzer according to claim 1, wherein the main body is further provided with a USB data interface and a program downloading interface.

3. The water quality detection analyzer according to claim 1 or 2, wherein the light source is an ultra-high brightness white light LED light source, the measuring bottle is a glass bottle with a neat surface, no scratch and light transmission, and a bottle cap is arranged on the measuring bottle; the display screen adopts an LCD display screen; the operation keys comprise a soft on-off key, a zero calibration key, a detection item selection key and a detection key.

4. The water quality detecting and analyzing instrument of claim 1 or 2, wherein a hinge seat is provided at one end of the instrument body close to the measuring chamber, and the light shielding cover is hinged to the hinge seat.

5. The water quality detection analyzer of claim 2, wherein the control unit comprises a controller, a memory; the controller is an ARM microcontroller GD32F103CBT6, a PB12 pin, a PB13 pin and a PB15 pin of the ARM microcontroller are respectively connected with 1 pin, 2 pin and 3 pin of a DA output module, 6 pins of the DA output module are connected with an automatic light tracing module, and the automatic light tracing module is connected with a light source and used for adjusting the light source to a set brightness before detection starts, namely performing zero calibration processing; a PB6 pin and a PB7 pin of the ARM microcontroller are connected with the color acquisition interface and connected with the color acquisition module through the color acquisition interface; the PA0-WAKEUP pin of the ARM microcontroller is connected with the power supply module; a PA2 pin and a PA3 pin of the ARM microcontroller are connected with the USB data interface; a PA13 pin and a PA14 pin of the ARM microcontroller are connected with a program downloading interface; a PB8 pin and a PB9 pin of the ARM microcontroller are connected with a soft on-off module, and the soft on-off module is connected with an operation key; and a PA5 pin, a PA7 pin, a PB0 pin, a PB1 pin and a PB10 pin of the ARM microcontroller are connected with the display screen.

6. The water quality detection analyzer according to claim 5, wherein the memory stores standard curves of standard solutions with different concentrations and RGB values for each detection item, the controller calculates the RGB values of the colors of the water sample to be detected after reaction according to the color acquisition module, and then calculates the content of one or a certain specific chemical component or mineral ion component in the water sample according to the standard curves of the standard solutions with different concentrations and the RGB values in the memory.

7. A method for detecting water quality using the water quality detection analyzer of claim 1, comprising the steps of:

8. The detecting method according to claim 7, wherein the step S10 is performed by reversing the top and bottom 20 times; when the measuring bottle is placed into the measuring chamber again in the step S11, the surface of the measuring bottle is ensured to be clean and free of scratches, fingerprints and water drops.