A portable ratiometric flame photometric analyzer and its detection method

Abstract

This invention provides a portable ratiometric flame photometric analysis device and detection method. In the detection unit of this invention, a reflector images the emission spectrum of the flame to be detected generated by the flame excitation unit, forming a mirror spectrum of the emission spectrum of the flame to be detected. A dual-channel filter separates the emission spectrum of the flame to be detected and its mirror spectrum, respectively acquiring the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element. An infrared camera acquires the intensity of the characteristic spectra of the element to be detected and the reference element, forming a light signal. The content of the element to be detected is obtained based on the ratio of the intensity of the flame emission spectrum of the element to that of the reference element and a standard curve. By using dual-channel simultaneous detection, the measurement error caused by uneven and fluctuating flame brightness, changes in environmental conditions and shooting parameters is reduced, thus improving the measurement accuracy and reliability.

Description

Technical Field

[0001] This invention relates to the field of flame emission spectroscopy detection technology, specifically to a portable ratiometric flame photometric analysis device and detection method. Summary of the Invention

[0002] To overcome the above problems, the present invention provides a portable ratiometric flame photometric analysis device and detection method.

[0003] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0004] A first aspect of the present invention provides a portable ratiometric flame photometric analyzer, comprising:

[0005] The sample introduction unit is used to atomize and then introduce the sample to be tested; the sample to be tested includes a reference element.

[0006] The flame excitation unit is used to eject a flame to excite the element to be detected and the reference element to form a characteristic spectrum, thereby forming the emission spectrum of the flame to be detected;

[0007] The detection unit includes a reflector, a dual-channel filter, and an infrared camera. The reflector images the emission spectrum of the flame to be detected generated by the flame excitation unit, forming a mirror spectrum of the emission spectrum of the flame to be detected. The dual-channel filter separates the emission spectrum of the flame to be detected and its mirror spectrum, respectively acquiring the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element. The infrared camera acquires the characteristic spectral data of the element to be detected and the reference element, forming an optical signal.

[0008] Data processing unit; used to process and analyze optical signals to obtain the concentration of the element to be detected in the sample.

[0009] In one or more embodiments, the detection unit includes a box body and a box cover;

[0010] A reflector is provided on the inner wall of the box body, and the top of the reflector is tilted away from the inner wall, forming a defined angle with the inner wall.

[0011] An infrared camera is installed on the box lid, and the infrared camera is opposite to the reflector.

[0012] A dual-channel filter is provided between the infrared camera and the reflector.

[0013] Preferably, the angle is 35~45°, and more preferably 40°.

[0014] In one or more embodiments, the flame ignition unit includes a spray gun lighter;

[0015] Preferably, in order to form a stable flame and reduce the influence of the surrounding environment on the flame, the flame lighter is a windproof flame lighter.

[0016] Preferably, a fixing member is provided on the inner wall of one side wall of the box body, and the fixing member fixes the spray gun lighter;

[0017] More preferably, the nozzle of the spray gun lighter is close to the reflector.

[0018] Preferably, a cooling water chamber is provided on the inner wall of the other side wall of the box body; a cooling water chamber outlet is provided at the top of the cooling water chamber; an exhaust port is provided at the top of the box body; and the cooling water chamber outlet is connected to the exhaust port. The flame heats the air inside the box body, generating localized high temperatures. The water in the cooling water chamber absorbs this heat, forming water vapor, which is then discharged through the exhaust port. The cooling water chamber not only reduces the temperature inside the box body, extending the service life of the portable ratio-type flame photometric analyzer, but also reduces the fire risk posed by the flame.

[0019] In one or more embodiments, the sample introduction unit includes an nebulizer and a T-shaped sample introduction tube; the T-shaped sample introduction tube includes a first sample introduction tube and a second sample introduction tube, the first sample introduction tube passing through the side wall of the box body and connected to the nebulizer; the second sample introduction tube is located inside the box body.

[0020] Preferably, the top of the second sample inlet tube is provided with a sample outlet, and the upper part of the sample outlet is close to the nozzle of the spray gun lighter.

[0021] Preferably, the sample injection unit further includes a collection container; the collection container is located inside the box body; the bottom of the second sample injection tube is inserted into the collection container;

[0022] The collection tank is connected to the waste liquid tank.

[0023] Preferably, in order to facilitate the timely flow away of the liquid condensed from the atomized droplets, the first injection tube is tilted downward along the direction of movement of the atomized droplets.

[0024] Preferably, in order to adjust the amount of mist, an adjustment component is provided at the junction of the first injection tube and the second injection tube;

[0025] Preferably, the adjusting component includes a glass rod, the top of which is conical;

[0026] The glass rod is located inside the second injection tube, and the top of the glass rod is located at the junction of the first and second injection tubes.

[0027] The lower part of the glass rod and the bottom of the second injection tube are fixed with rubber stoppers.

[0028] In one or more embodiments, an infrared camera acquires the intensity of the characteristic spectra of the element to be detected and the reference element, forming an optical signal.

[0029] In one or more embodiments, the data processing unit includes a data transmission line and a chip, smartphone, computer, etc., equipped with data processing functions.

[0030] Preferably, devices such as chips, smartphones, and computers with data processing capabilities obtain the content of the element to be measured based on the ratio of the flame emission spectral intensity of the element to be measured to the flame emission spectral intensity of the reference element and a standard curve.

[0031] A second aspect of the present invention provides a method for detecting the content of alkali metals or alkaline earth metals, comprising the following steps:

[0032] (1) Add a substance containing a reference element to the sample solution to be tested to form the sample to be tested;

[0033] (2) Obtain flame emission spectrum images of the sample to be tested in the visible and near-infrared light bands; obtain flame emission spectrum intensity images of the alkali metal or alkaline earth metal to be tested and flame emission spectrum intensity images of the reference element based on the characteristic wavelength of the alkali metal or alkaline earth metal to be tested and the characteristic wavelength of the flame emission spectrum of the reference element, respectively.

[0034] (3) Obtain the content of alkali metal or alkaline earth metal elements based on the ratio of the flame emission spectral intensity of the alkali metal or alkaline earth metal in the sample to the flame emission spectral intensity of the reference element and the standard curve.

[0035] In one or more embodiments, the reference element is Cs.

[0036] The alkali metal or alkaline earth metal elements include Rb and K, preferably K.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention provides a portable ratiometric flame photometric analysis device and detection method. The detection unit of this invention includes a reflector, a dual-channel filter, and an infrared camera. The reflector images the emission spectrum of the flame to be detected, generated by the flame excitation unit, forming a mirror spectrum of the emission spectrum of the flame to be detected. The dual-channel filter separates the emission spectrum of the flame to be detected and its mirror spectrum, respectively acquiring the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element. The infrared camera acquires the intensity of the characteristic spectra of the element to be detected and the reference element, forming a light signal. The content of the element to be detected is obtained based on the ratio of the intensity of the flame emission spectrum of the element to that of the reference element and a standard curve. This invention uses simultaneous dual-channel detection, with the ratio of the intensity of the flame emission spectrum of the element to that of the reference element as the analysis signal. This reduces measurement errors caused by uneven and fluctuating flame brightness, changes in environmental conditions, and shooting parameters, thus improving measurement accuracy and reliability. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Figure 1 This is a schematic diagram of the principle of a portable ratiometric flame photometric analyzer.

[0041] Figure 2 This is a schematic diagram of a portable ratiometric flame photometric analyzer; where A is a schematic diagram of the structure with the cover closed; B is a cross-sectional view; C is a schematic diagram of the camera and data processing unit; and D and E are schematic diagrams of the dual-channel filter and infrared camera.

[0042] Figure 1 and Figure 2 In the middle, 1-nebulizer, 2-sample injector, 3-emission spectrum of the flame to be detected, 4-reflector, 5-mirror image spectrum of the emission spectrum of the flame to be detected, 6-dual-channel filter, 7-infrared camera, 8-data transmission line, 9-USB adapter, 10-smartphone with data processing function, 11-waste liquid tank, 12-exhaust port, 13-cooling water chamber, 14-lid, 15-spray gun lighter, 16-waste liquid tube, 17-fixing component, 18-first sample injection tube, 19-second sample injection tube, 20-inner sidewall, 21-box body, 22-collection tank, 23-camera protection box, 24-dual-channel filter holder;

[0043] Figure 3 This is the standard curve. Detailed Implementation

[0044] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0047] In the following embodiments, the infrared camera has a light-sensing range of 700~1000 nm and an exposure value of -13~-1.

[0048] The smartphone is a Redmi Note 11T Pro.

[0049] Example 1

[0050] Figure 1 This is a schematic diagram of the principle of a portable ratiometric flame photometric analyzer. Figure 2 This is a schematic diagram of a portable ratiometric flame photometric analyzer.

[0051] refer to Figure 1 and Figure 2 A portable ratiometric flame photometric analyzer, comprising:

[0052] The sample introduction unit is used to atomize and introduce the sample to be tested; the sample to be tested includes a reference element.

[0053] The flame excitation unit is used to eject a flame to excite the element to be detected and the reference element to form a characteristic spectrum, thereby forming the emission spectrum of the flame to be detected;

[0054] The detection unit includes a reflector 4, a dual-channel filter 6, and an infrared camera 7. The reflector 4 images the emission spectrum of the flame to be detected generated by the flame excitation unit, forming a mirror spectrum of the emission spectrum of the flame to be detected. The dual-channel filter 6 separates the emission spectrum of the flame to be detected and its mirror spectrum, respectively acquiring the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element. The infrared camera 7 acquires the characteristic spectral data of the element to be detected and the reference element, forming an optical signal.

[0055] Data processing unit; used to process and analyze optical signals to obtain the concentration of the element to be detected in the sample.

[0056] The detection unit includes a box body 21 and a box cover 14. A reflector 4 is provided on the inner sidewall 20 of the box body 21. The top of the reflector 4 is tilted away from the inner sidewall 20, forming a defined angle with the inner sidewall 20. The defined angle is 40°. An infrared camera 7 is provided on the box cover 14. The infrared camera 7 is opposite to the reflector 4. A dual-channel filter 6 is provided between the infrared camera 7 and the reflector 4.

[0057] In order to protect the camera, a camera protection box 23 is provided on the cover 14, and an infrared camera 7 is placed inside the camera protection box 23.

[0058] A dual-channel filter bracket 24 is fixed on the camera protection box 23; the dual-channel filter 6 is fixed on the dual-channel filter bracket 24;

[0059] To reduce the impact of the surrounding environment on the detection, the entire detection unit is housed in a box. To ensure portability, extend the lifespan of the flame photometric analyzer, and reduce the fire risk posed by the flame, both the box body 21 and the lid 14 are made of aluminum alloy. With the lid 14 closed, the entire box measures 12×9×20 cm.

[0060] The flame ignition unit includes a blowtorch lighter 15. To create a stable flame and reduce the influence of the surrounding environment, the blowtorch lighter 15 is a windproof type. The blowtorch lighter 15 is equipped with an air inlet and uses butane as fuel, enabling continuous flame emission and flame size adjustment. For ease of ignition and to ensure a continuous flow of air into the blowtorch lighter 15 and maintain flame continuity, the blowtorch lighter 15 is positioned outside the housing detection unit.

[0061] A fastener 17 is provided on the inner wall of one side wall of the box body 21, and the fastener 17 is fixedly connected to the inner wall of the side wall of the box body 21. A through hole is provided between the top and bottom surfaces of the fastener 17, and the diameter of the through hole is slightly larger than the diameter of the nozzle of the blowtorch lighter 15. The nozzle of the blowtorch lighter 15 passes through the through hole of the fastener 17 and enters the interior of the box body 21. The fastener 17 can fix and support the blowtorch lighter 15, ensuring the stability of the flame.

[0062] In order to image the emission spectrum of the flame to be detected generated by the flame excitation unit, the nozzle of the spray gun lighter 15 is placed close to the reflector 4.

[0063] A cooling water chamber 13 is provided on the inner wall of the other side wall of the housing 21; a cooling water chamber outlet is provided on the top of the cooling water chamber 13; an exhaust port 12 is provided on the top of the housing 21; the outlet of the cooling water chamber 13 is connected to the exhaust port 12. The flame heats the air in the housing 21, thereby generating local high temperature. The water in the cooling water chamber 13 can absorb heat and form water vapor, which is discharged through the exhaust port 12. The cooling water chamber 13 not only reduces the temperature inside the housing and extends the service life of the portable ratio-type flame photometric analyzer, but also reduces the fire risk caused by the flame.

[0064] The sample introduction unit includes an nebulizer 1 and a T-shaped sample introduction tube; the T-shaped sample introduction tube includes a first sample introduction tube 18 and a second sample introduction tube 19. The first sample introduction tube 18 passes through the side wall of the box body 21 and is connected to the nebulizer 1; the second sample introduction tube 19 is located inside the box body 21. For convenient sample loading, the nebulizer 1 is located on the outside of the box body 21; in order to improve the nebulization effect while being portable, the nebulizer 1 is an ultrasonic nebulizer.

[0065] The top of the second sample inlet tube 19 is provided with a sample outlet, which is close to the nozzle of the spray gun lighter 15. When the atomized sample encounters the flame generated by the nozzle of the spray gun lighter 15, the element to be detected and the reference element form an excited characteristic spectrum, which in turn forms the emission spectrum of the flame to be detected. If the sample outlet 19 is too far from the nozzle of the spray gun lighter 15, the atomized droplets will condense, and the emission spectrum of the flame to be detected will not be formed.

[0066] To facilitate the collection of condensed liquid, the sample injection unit also includes a collection tank 22; the collection tank 22 is located inside the box body 21; the bottom of the second sample injection tube 19 is inserted into the collection tank 22; in order to discharge waste liquid, the collection tank 22 is connected to the waste liquid tank 11 through the waste liquid pipe 16.

[0067] To facilitate the timely removal of liquid condensed from the atomized droplets, the first injection tube 18 is tilted downwards along the direction of the atomized droplets' movement.

[0068] To adjust the amount of mist, an adjustment component is provided at the junction of the first and second injection tubes; the adjustment component includes a glass rod with a conical top; the glass rod is located inside the second injection tube, and the top of the glass rod is located at the junction of the first and second injection tubes; the lower part of the glass rod and the bottom of the second injection tube are fixed by a rubber stopper.

[0069] An infrared camera acquires the intensity of the characteristic spectra of the element to be detected and the reference element, forming an optical signal.

[0070] The data processing unit includes a data transmission line 8 and a smartphone equipped with data processing capabilities. The smartphone with data processing capabilities obtains the content of the analyte based on the ratio of the flame emission spectral intensity of the analyte to that of the reference element and a standard curve.

[0071] The working principle of the portable ratiometric flame photometric analyzer in this embodiment includes:

[0072] A substance containing a reference element is added to the sample solution to be tested, forming a test sample. The test sample is atomized by the nebulizer 1 in the injection unit to form small droplets. The small droplets enter the second injection tube 19 through the first injection tube 18 of the T-shaped injection tube and overflow from the sample outlet at the top of the second injection tube 19. The atomized test sample encounters the flame generated by the nozzle of the spray gun lighter 15, and the test element and the reference element form an excited characteristic spectrum, which in turn forms the emission spectrum of the test flame. The reflector 4 images the emission spectrum of the test flame generated by the flame excitation unit, forming a mirror spectrum of the emission spectrum of the test flame. The dual-channel filter 6 separates the emission spectrum of the test flame and the mirror spectrum of the emission spectrum of the test flame, and obtains the characteristic spectrum of the test element and the characteristic spectrum of the reference element, respectively. The infrared camera 7 acquires the characteristic spectral data of the test element and the reference element, forming an optical signal. The optical signal is transmitted to a smartphone with data processing function through the data transmission line 8. Smartphones with data processing capabilities obtain the content of the element to be measured based on the ratio of the flame emission spectral intensity of the element to be measured to that of the reference element and the standard curve.

[0073] Example 2

[0074] Using the portable ratiometric flame photometric analyzer described in Example 1 to analyze K in the sample + Test:

[0075] Since the sample to be tested does not contain cesium, and the emission wavelength of cesium atoms is 850 nm, which is within the range that the infrared camera can capture; at the same time, cesium ions (Cs) + The ionization energy of sodium ions (approximately 375.7 kJ / mol) is lower than that of sodium ions (Na+). + (approximately 495.8 kJ / mol), therefore Cs + Than Na + Easier to activate; Cs + By inhibiting Na + The excitation of potassium ions (K) reduces the intensity of the yellow flame, thereby increasing the concentration of potassium ions (K). + The signals from other ions, such as Cs, are more prominent. Therefore, Cs was chosen as the reference element.

[0076] The specific operation process is as follows:

[0077] (1) Wash the nebulizer three times with deionized water, and simultaneously spray and rinse the T-type injection tube;

[0078] (2) Turn on the control program of the infrared camera, adjust the shooting parameters and exposure value; ignite the torch lighter, collect images of the emission spectrum of the flame to be detected in the deionized water and the mirror spectrum of the emission spectrum of the flame to be detected, transmit them to the built-in storage of the smartphone through the data transmission line, and store them as the background intensity of the flame.

[0079] (3) Use 1 mL containing K + and Cs + The nebulizer and T-type injection tube were rinsed with the solution to be tested;

[0080] (4) Add 2 mL of standard solution to the sample cell of the nebulizer. The standard solution contains K at gradient concentrations (0~200 μM). + and the specified concentration (100 μM) of Cs + After adjusting the injection volume, the nebulizer is started to spray the test solution into the flame. The emission spectra of the flame to be detected and its mirror image are continuously captured in the two sampling channels of 770 nm and 850 nm. The data is then transmitted to the built-in storage of the smartphone via the data transmission line and stored.

[0081] (5) Open the image processing software on your smartphone, import the saved image, select the central region of the flame image for analysis, use the average brightness of multiple images as the analysis signal, perform nonlinear correction according to Equation 1, and use Cs + As a reference signal, K + With Cs + luminance ratio (H K / H Cs ( ) is used as the detection signal; a standard curve is obtained.

[0082] Flame emission spectra recorded by infrared cameras, ideally, show a direct correlation between the brightness value and intensity of the flame emission spectrum. However, since the saturation value of smartphone image brightness is 255, the image brightness gradually approaches saturation within a higher concentration range, causing the standard curve to exhibit significant nonlinear bending. Therefore, nonlinear correction is required. To address this, a correction model based on the dimensionless parameter H (see Equation 1) is proposed, which broadens the linear range of the standard curve. Under the experimental conditions used, the brightness values ​​GV and K... + The relationship curve between concentration C and concentration C can be fitted using the following regression model: The formula is rearranged and transformed to obtain formula 1. Figure 3 In the diagram, curve a represents the image brightness value GV as a function of K. +The change curve of concentration C clearly shows that the brightness response curve is non-linear. Curve b, with the corrected H... k / H Cs For signal analysis, the response curve exhibits a good linear relationship.

[0083] Formula 1;

[0084] In the formula, It is the average background brightness of the flame image. It is the average brightness of the flame image of the sample liquid. k It is a coefficient related to the sensitivity of the camera's image sensor.

[0085] It should be noted that Equation 1 is only applicable to... The case where <220. When When the value approaches 255, the denominator is 255- As the light intensity gradually approaches zero, the measurement error of the calibrated light intensity increases. At this point, the sample can be diluted with deionized water, or the photosensitivity of the infrared camera can be adjusted to reduce the brightness of the captured image.

[0086] The obtained standard curve is as follows Figure 3 As shown.

[0087] Its linear range is 10–200 μM. Based on the principle of a three-fold signal-to-noise ratio (S / N=3), the limit of detection (LOD) is 1.16 μM.

[0088] Example 4

[0089] Real sample testing:

[0090] K in the Xiaoqing River + Detection: Sampling points were located along the Jinan section of the Xiaoqing River, and the air temperature was recorded using a mobile phone sensor. Water samples were collected according to the sampling specifications and the analytical purpose. Before testing, the water samples were filtered through a 0.45 µm filter membrane to remove suspended solids. 5.00 mL of the filtered water sample, diluted twice, was taken and 100 μL of 5.1 mM Cs was added. + Prepare a reference solution and mix thoroughly. Place the mixture in an atomizer and perform a flame test, measuring the ratio of flame image brightness between the sample and the reference. Calculate the K0 of the water sample based on the stored calibration curve. + Concentration; the final detected concentration was 0.344 ± 0.005 mM, which was verified using the emission mode of the PE-A800, and the measured result was 0.339 ± 0.002 mM.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A portable ratiometric flame photometric analyzer, characterized in that, It includes: The sample introduction unit is used to atomize and then introduce the sample to be tested; the sample to be tested includes a reference element. The flame excitation unit is used to eject a flame to excite the element to be detected and the reference element to form a characteristic spectrum, thereby forming the emission spectrum of the flame to be detected; The detection unit is equipped with a reflector, a dual-channel filter, and an infrared camera. The reflector images the emission spectrum of the flame to be detected generated by the flame excitation unit, forming a mirror spectrum of the emission spectrum of the flame to be detected. The dual-channel filter separates the emission spectrum of the flame to be detected and the mirror spectrum of the emission spectrum of the flame to be detected, and obtains the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element, respectively. The infrared camera acquires the characteristic spectral data of the element to be detected and the reference element, and forms an optical signal; Data processing unit; used to process and analyze optical signals to obtain the concentration of the element to be detected in the sample. The detection unit includes a box body and a box cover; A reflector is provided on the inner wall of the box body, and the top of the reflector is tilted away from the inner wall, forming a defined angle with the inner wall. An infrared camera is installed on the box lid, and the infrared camera is opposite to the reflector. A dual-channel filter is provided between the infrared camera and the reflector.

2. The portable ratiometric flame photometric analyzer as described in claim 1, characterized in that, The flame ignition unit includes a flame gun lighter.

3. The portable ratiometric flame photometric analyzer as described in claim 2, characterized in that, The lighter described is a windproof lighter.

4. The portable ratiometric flame photometric analyzer as described in claim 1, characterized in that, A fastener is provided on the inner wall of one side wall of the box body, and the fastener secures the spray gun lighter.

5. The portable ratiometric flame photometric analyzer as described in claim 4, characterized in that, The nozzle of the spray gun lighter is close to the reflector.

6. The portable ratiometric flame photometric analyzer as described in claim 1, characterized in that, A cooling water chamber is provided on the inner wall of the other side wall of the box body; a cooling water chamber outlet is provided on the top of the cooling water chamber; an exhaust port is provided on the top of the box body; the cooling water chamber outlet is connected to the exhaust port.

7. The portable ratiometric flame photometric analyzer as described in claim 1, characterized in that, The sample introduction unit includes an nebulizer and a T-shaped sample introduction tube; the T-shaped sample introduction tube includes a first sample introduction tube and a second sample introduction tube, the first sample introduction tube passes through the side wall of the box body and is connected to the nebulizer; the second sample introduction tube is located inside the box body.

8. The portable ratiometric flame photometric analyzer as described in claim 7, characterized in that, The top of the second inlet tube is provided with an outlet, and the outlet is close to the nozzle of the spray gun lighter.

9. The portable ratiometric flame photometric analyzer as described in claim 7, characterized in that, The sample injection unit also includes a collection container; the collection container is located inside the box body; the bottom of the second sample injection tube is inserted into the collection container; The collection tank is connected to the waste liquid tank.

10. The portable ratiometric flame photometric analyzer as described in claim 7, characterized in that, The first sample inlet tube is tilted downwards along the direction of movement of the atomized droplets.

11. The portable ratiometric flame photometric analyzer as described in claim 7, characterized in that, An adjustment component is provided at the junction of the first and second injection tubes.

12. The portable ratiometric flame photometric analyzer as described in claim 11, characterized in that, The adjusting component includes a glass rod with a conical top. The glass rod is located inside the second injection tube, and its top is located at the junction of the first and second injection tubes. The lower part of the glass rod and the bottom of the second injection tube are fixed by rubber stoppers.

13. The portable ratiometric flame photometric analyzer as described in claim 1, characterized in that, An infrared camera acquires the intensity of the characteristic spectra of the element to be detected and the reference element, forming an optical signal.

14. The portable ratiometric flame photometric analyzer as described in claim 1, characterized in that, The data processing unit includes data transmission lines and chips, smartphones, and computers equipped with data processing functions.

15. The portable ratiometric flame photometric analyzer as described in claim 14, characterized in that, Chips, smartphones, and computers with data processing capabilities obtain the content of the element to be measured based on the ratio of the flame emission spectral intensity of the element to be measured to that of the reference element and the standard curve.

16. A method for detecting the content of alkali metals or alkaline earth metals using the portable ratiometric flame photometric analyzer according to any one of claims 1 to 15, characterized in that, Includes the following steps: (1) Add a substance containing a reference element to the sample solution to be tested to form the sample to be tested; (2) Obtain flame emission spectrum images of the sample to be tested in the visible and near-infrared light bands; obtain flame emission spectrum intensity images of alkali metals or alkaline earth metals and flame emission spectrum intensity images of reference elements based on the characteristic wavelengths of the alkali metals or alkaline earth metals to be tested and the characteristic wavelengths of the flame emission spectra of the reference elements, respectively. (3) Obtain the content of alkali metal or alkaline earth metal elements based on the ratio of the flame emission spectral intensity of the alkali metal or alkaline earth metal in the sample to the flame emission spectral intensity of the reference element and the standard curve.

17. The method as described in claim 16, characterized in that, The reference element is Cs; The alkali metal or alkaline earth metal elements include Rb and K.

18. The method as described in claim 17, characterized in that, The alkali metal or alkaline earth metal element is K.

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