Portable ratio type flame photometric analysis device and detection method

Abstract

The invention provides a portable ratio type flame photometric analysis device and a detection method.In a detection unit of the portable ratio type flame photometric analysis device, a reflector images a to-be-detected flame emission spectrum formed by excitation of a flame excitation unit, and a mirror image spectrum of the to-be-detected flame emission spectrum is formed; the double-channel optical filter separates the emission spectrum of the flame to be detected and the mirror image spectrum of the emission spectrum of the flame to be detected, and the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element are obtained respectively; the infrared camera obtains the intensity of the characteristic spectrum of the to-be-detected element and the reference element to form an optical signal, and the content of the to-be-detected element is obtained according to the ratio of the flame emission spectrum intensity of the to-be-detected element to the flame emission spectrum intensity of the reference element and the standard curve. Through simultaneous detection of the two channels, measurement errors caused by non-uniform and fluctuating flame brightness and changes of environmental conditions, shooting parameters and the like are reduced, and the measurement accuracy and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flame emission spectrum detection, and in particular to a portable ratio-type flame photometric analysis device and a detection method. Summary of the Invention

[0002] In order to overcome the above problems, the present invention provides a portable ratio-type flame photometric analysis device and a detection method.

[0003] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A first aspect of the present invention provides a portable ratiometric flame photometric analyzer comprising: The sampling unit is used to inject the sample after atomization; the sample includes a reference element; The flame excitation unit is used to spray flames to excite the element to be detected and the reference element to form a characteristic spectrum, thereby forming an emission spectrum of the flame to be detected; The detection unit is provided with a reflector, a dual-channel filter, and an infrared camera. The reflector images the emission spectrum of the flame to be detected formed by the flame excitation unit to form 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 to obtain the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element respectively; the infrared camera obtains the characteristic spectrum data of the element to be detected and the reference element to form an optical signal; Data processing unit; used to process and analyze the optical signal to obtain the concentration of the element to be detected in the sample to be tested.

[0004] In one or more embodiments, the detection unit includes a box body and a box cover; A reflector is provided on the inner side wall of the box body, and the top of the reflector is inclined away from the inner side wall to form a limited angle with the inner side wall; The box cover is provided with an infrared camera, which is opposite to the reflector; A dual-channel filter is provided between the infrared camera and the reflector.

[0005] Preferably, the defined angle is 35-45°, preferably 40°.

[0006] In one or more embodiments, the flame ignition unit comprises a spray gun lighter; Preferably, in order to form a stable flame and reduce the influence of the surrounding environment on the flame, the spray gun lighter is a windproof spray gun lighter.

[0007] Preferably, a fixing piece is provided on the inner wall of one side wall of the box body, and the fixing piece fixes the spray gun lighter; Further preferably, the nozzle of the spray gun lighter is close to the reflector.

[0008] Preferably, a cooling water tank is provided on the inner wall of the other side wall of the box body; a cooling water tank outlet is provided at the top of the cooling water tank; an exhaust hole is provided at the top of the box body; and the cooling water tank outlet is connected to the exhaust port. The flame heats the air within the box body, generating a localized high temperature. The water within the cooling water tank absorbs the heat, forming water vapor, which is discharged through the exhaust port. The provision of the cooling water tank not only reduces the temperature within the box body, extending the service life of the portable ratiometric flame photometry device, but also reduces the risk of fire caused by the flame.

[0009] In one or more embodiments, the injection unit includes a nebulizer and a T-shaped injection tube; the T-shaped injection tube includes a first injection tube and a second injection tube, the first injection tube passes through the side wall of the box body and is connected to the nebulizer; the second injection tube is located in the box body.

[0010] Preferably, a sample outlet is provided at the top of the second sample inlet tube, and the upper portion of the sample outlet is close to the nozzle of a spray gun lighter.

[0011] Preferably, the sampling unit further comprises a collecting tank; the collecting tank is located in the box body; the bottom of the second sampling tube is inserted into the collecting tank; The collecting tank is connected to the waste liquid tank.

[0012] Preferably, in order to facilitate the timely flow of liquid condensed from the atomized small droplets, the first sampling tube is tilted downward along the movement direction of the atomized small droplets.

[0013] Preferably, in order to adjust the amount of mist, an adjusting component is provided at the junction of the first sampling tube and the second sampling tube; Preferably, the adjusting component comprises a glass rod, the top of which is conical; The glass rod is located in the second sample injection tube, and the top of the glass rod is located at the junction of the first sample injection tube and the second sample injection tube; The lower part of the glass rod and the bottom of the second sampling tube are fixed by a rubber stopper.

[0014] In one or more embodiments, the infrared camera acquires the intensity of the characteristic spectra of the element to be detected and the reference element to form a light signal.

[0015] In one or more embodiments, the data processing unit includes a data transmission line and a chip, a smart phone, a computer, etc. equipped with data processing functions.

[0016] Preferably, a device such as a chip, smart phone, computer, etc. with data processing function obtains the content of the element to be measured based on the ratio of the flame emission spectrum intensity of the element to be measured to the flame emission spectrum intensity of the reference element and the standard curve.

[0017] A second aspect of the present invention provides a method for detecting the content of alkali metal or alkaline earth metal elements, comprising the following steps: (1) Add a substance containing a reference element to the sample solution to be tested to form a sample to be tested; (2) Obtaining flame emission spectrum images of the sample to be tested in the visible light and near-infrared light bands; obtaining flame emission spectrum intensity images of the alkali metal or alkaline earth metal 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; (3) The alkali metal or alkaline earth metal element content is obtained based on the ratio of the flame emission spectrum intensity of the alkali metal or alkaline earth metal of the sample to be tested to the flame emission spectrum intensity of the reference element and the standard curve.

[0018] In one or more embodiments, the reference element is Cs.

[0019] The alkali metal or alkaline earth metal element includes Rb and K, preferably K.

[0020] The beneficial effects of the present invention are: The present invention provides a portable ratiometric flame photometric analyzer and detection method. The detection unit of the present invention 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, formed by the flame excitation unit, to form a mirror image spectrum of the flame emission spectrum to be detected. The dual-channel filter separates the emission spectrum of the flame to be detected and the mirror image spectrum of the flame emission spectrum to be detected, respectively obtaining a characteristic spectrum of the element to be detected and a characteristic spectrum of a reference element. The infrared camera obtains the intensities of the characteristic spectra of the element to be detected and the reference element to form a light signal. The content of the element to be detected is obtained based on the ratio of the flame emission spectrum intensity of the element to be detected to the flame emission spectrum intensity of the reference element and a standard curve. In the present invention, dual-channel simultaneous detection is performed, and the ratio of the flame emission spectrum intensity of the element to be detected to the flame emission spectrum intensity of the reference element is used as the analysis signal. This reduces measurement errors caused by uneven and fluctuating flame brightness, changes in environmental conditions, and shooting parameters, thereby improving measurement accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 This is a schematic diagram of the principle of a portable ratiometric flame photometric analyzer; Figure 2 Schematic diagram of the structure of a portable ratiometric flame photometric analyzer; A is a schematic diagram of the structure with the lid closed; B is a cross-sectional view; C is a schematic diagram of the structure of the camera and data processing unit; D and E are schematic diagrams of the structure of the dual-channel filter and infrared camera; Figure 1 and Figure 2 In the figure, 1-atomizer, 2-sample injector, 3-emission spectrum of the flame to be detected, 4-reflector, 5-mirror 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-box cover, 15-spray gun lighter, 16-waste liquid pipe, 17-fixing part, 18-first sample injection tube, 19-second sample injection tube, 20-inner wall, 21-box body, 22-collection tank, 23-camera protection box, 24-dual-channel filter holder; Figure 3 For the standard curve. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] In order to enable those skilled in the art to more clearly 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.

[0026] In the following embodiments, the infrared camera has a sensitivity range of 700 to 1000 nm and an exposure value of -13 to -1; The smartphone is Redmi Note 11T Pro.

[0027] Example 1 Figure 1This is a schematic diagram of the principle of a portable ratiometric flame photometric analyzer; Figure 2 This is a schematic diagram of the structure of a portable ratiometric flame photometric analyzer.

[0028] refer to Figure 1 and Figure 2 , a portable ratiometric flame photometric analyzer, comprising: The sampling unit is used for atomizing and then injecting the sample to be tested; the sample to be tested includes a reference element; The flame excitation unit is used to spray flames to excite the element to be detected and the reference element to form a characteristic spectrum, thereby forming an emission spectrum of the flame to be detected; The detection unit is provided with 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 formed by the flame excitation unit to form 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 the mirror spectrum of the emission spectrum of the flame to be detected to obtain the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element respectively; the infrared camera 7 obtains the characteristic spectrum data of the element to be detected and the reference element to form an optical signal; Data processing unit; used to process and analyze the optical signal to obtain the concentration of the element to be detected in the sample to be tested.

[0029] Among them, the detection unit includes a box body 21 and a box cover 14; a reflector 4 is provided on the inner wall 20 of the box body 21, and the top of the reflector 4 is inclined in the direction away from the inner wall 20, forming a limited angle with the inner wall 20; the limited angle is 40°; an infrared camera 7 is provided on the box cover 14, and 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.

[0030] In order to protect the camera, a camera protection box 23 is provided on the box cover 14, and the infrared camera 7 is placed in the camera protection box 23; A dual-channel filter holder 24 is fixed on the camera protection box 23; the dual-channel filter 6 is fixed on the dual-channel filter holder 24; To minimize the impact of the surrounding environment on detection, the entire detection unit is housed in a box. To ensure portability, extend the lifespan of the flame photometric analyzer, and reduce the risk of fire caused by flames, both the box body 21 and the box lid 14 are constructed of aluminum alloy. With the box lid 14 in place, the entire box measures 12 × 9 × 20 cm.

[0031] The flame ignition unit includes a spray gun lighter 15. To form a stable flame and reduce the impact of the surrounding environment on the flame, the spray gun lighter 15 is windproof. The spray gun lighter 15 is equipped with an air inlet. It uses butane as fuel, can continuously spray a flame, and the flame size can be adjusted. To facilitate the ignition operation and ensure that air can continuously enter the spray gun lighter 15 to ensure the continuity of the flame, the spray gun lighter 15 is installed outside the box detection unit.

[0032] A fixing member 17 is provided on the inner wall of one side wall of the box body 21 and 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 fixing member 17. The diameter of the through hole is slightly larger than the diameter of the nozzle of the spray gun lighter 15. The nozzle of the spray gun lighter 15 passes through the through hole of the fixing member 17 and enters the interior of the box body 21. The fixing member 17 can fix and support the spray gun lighter 15, ensuring the stability of the flame.

[0033] In order to image the emission spectrum of the flame to be detected formed by the flame excitation unit, the nozzle of the spray gun lighter 15 is close to the reflector 4.

[0034] A cooling water tank 13 is located on the inner wall of the other side of the box body 21. A cooling water tank outlet is located at the top of the cooling water tank 13. An exhaust hole 12 is located at the top of the box body 21. The cooling water tank 13 outlet is connected to the exhaust hole 12. The flame heats the air within the box body 21, generating a localized high temperature. The water within the cooling water tank 13 absorbs the heat, forming water vapor, which is then discharged through the exhaust hole 12. The presence of the cooling water tank 13 not only lowers the temperature within the box body, extending the service life of the portable ratiometric flame photometry device, but also reduces the risk of fire caused by the flame.

[0035] The sample injection unit includes a nebulizer 1 and a T-shaped sample injection tube. The T-shaped sample injection tube includes a first sample injection tube 18 and a second sample injection tube 19. The first sample injection tube 18 passes through the side wall of the box body 21 and connects to the nebulizer 1. The second sample injection tube 19 is located inside the box body 21. To facilitate sample loading, the nebulizer 1 is located outside the box body 21. To ensure portability and improve atomization efficiency, the nebulizer 1 is an ultrasonic nebulizer.

[0036] A sample outlet is located at the top of second sample inlet tube 19, with the upper portion of outlet 19 positioned close to the nozzle of spray lighter 15. When the atomized sample encounters the flame generated by the nozzle of spray lighter 15, the element to be tested and the reference element are excited to produce characteristic spectra, which in turn form the flame emission spectrum to be tested. If outlet 19 is too far from the nozzle of spray lighter 15, the atomized droplets will condense, preventing the formation of the flame emission spectrum to be tested.

[0037] To facilitate the collection of condensed liquid, the sampling unit also includes a collection tank 22; the collection tank 22 is located in the box body 21; the bottom of the second sampling tube 19 is inserted into the collection tank 22; in order to discharge the waste liquid, the collection tank 22 is connected to the waste liquid tank 11 through the waste liquid pipe 16.

[0038] In order to facilitate the timely flow of liquid condensed from the atomized droplets, the first injection tube 18 is tilted downward along the moving direction of the atomized droplets.

[0039] In order to adjust the amount of mist, an adjustment component is provided at the junction of the first sampling tube and the second sampling tube; the adjustment component includes a glass rod, the top of the glass rod is conical; the glass rod is located in the second sampling tube, and the top of the glass rod is located at the junction of the first sampling tube and the second sampling tube; the lower part of the glass rod and the bottom of the second sampling tube are fixed by a rubber stopper.

[0040] The infrared camera obtains the intensity of the characteristic spectrum of the element to be detected and the reference element to form a light signal.

[0041] The data processing unit includes a data transmission line 8 and a smart phone equipped with data processing function. The smart phone with data processing function obtains the content of the element to be measured based on the ratio of the flame emission spectrum intensity of the element to be measured to the flame emission spectrum intensity of the reference element and the standard curve.

[0042] The working principle of the portable ratiometric flame photometric analyzer in this embodiment includes: A substance containing a reference element is added to the sample solution to be tested to form a sample to be tested; the sample to be tested is atomized by the atomizer 1 in the sampling unit to form small droplets, which enter the second sampling tube 19 through the first sampling tube 18 of the T-shaped sampling tube and overflow from the sampling port at the top of the second sampling tube 19; the atomized sample to be tested encounters the flame generated by the nozzle of the spray gun lighter 15, and the element to be tested and the reference element form an excited characteristic spectrum, thereby forming a flame emission spectrum to be tested; the reflector 4 images the flame emission spectrum to be tested formed by the flame excitation unit to form a mirror spectrum of the flame emission spectrum to be tested; the dual-channel filter 6 separates the flame emission spectrum to be tested and the mirror spectrum of the flame emission spectrum to be tested, and obtains the characteristic spectrum of the element to be tested and the characteristic spectrum of the reference element respectively; the infrared camera 7 obtains the characteristic spectrum data of the element to be tested and the reference element to form an optical signal; the optical signal is transmitted to a smart phone with data processing function through a data transmission line 8. The smart phone with data processing function obtains the content of the element to be measured based on the ratio of the flame emission spectrum intensity of the element to be measured to the flame emission spectrum intensity of the reference element and the standard curve.

[0043] Example 2 The K content in the sample to be tested was analyzed using the portable ratio flame photometric analyzer in Example 1.+ To perform the test: Since the sample to be tested does not contain cesium, the emission wavelength of cesium atoms is 850 nm, which is within the range that can be captured by the infrared camera. At the same time, cesium ions (Cs + ) has a lower ionization energy (about 375.7 kJ / mol) than sodium ion (Na + ) (about 495.8 kJ / mol), so Cs + Than Na + Easier to stimulate; Cs + By inhibiting Na + excitation, reducing the intensity of the yellow flame, thereby making potassium ions (K + ) are more prominent. Therefore, Cs was selected as the reference element.

[0044] The specific operation process is as follows: (1) Wash the atomizer three times with deionized water and spray rinse the T-type injection tube at the same time; (2) Start the control program of the infrared camera, adjust the shooting parameters and exposure value; ignite the spray gun lighter, collect images of the emission spectrum of the flame to be detected in 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; (3) Use 1 mL of K + and Cs + Rinse the nebulizer and T-type injection tube with the test solution; (4) Add 2 mL of standard solution containing gradient concentrations (0-200 μM) of K + and a limited concentration (100 μM) of Cs + , adjust the injection volume, start the atomizer to spray the test solution into the flame, continuously capture the emission spectrum of the flame to be detected in the two sampling channels of 770 nm and 850 nm, and the mirror spectrum of the emission spectrum of the flame to be detected, and transmit them to the built-in storage of the smartphone through the data transmission line and store them; (5) Open the image processing software in the smartphone, import the saved image, select the center area of ​​the flame image for analysis, use the average brightness of multiple images as the analysis signal, and perform nonlinear correction according to formula 1 to obtain the Cs + As a reference signal, K + With Cs + Brightness ratio (H K / H Cs ) as the detection signal; obtain a standard curve.

[0045] The flame emission spectrum recorded by an infrared camera is ideally proportional to the brightness of the flame emission spectrum. However, since the saturation value of the image brightness of a smartphone is 255, the image brightness gradually approaches saturation in a higher concentration range, and the standard curve shows obvious nonlinear curvature. Nonlinear correction is required. To this end, a correction model based on the dimensionless parameter H is proposed (see formula 1) to make the linear range of the standard curve wider. Under the experimental conditions used, the brightness value GV is proportional to the intensity of the flame emission spectrum. + The relationship curve between the concentrations C can be fitted with the following regression model: ; After rearrangement and deformation, this formula is obtained as formula 1. Figure 3 In the figure, curve a is the image brightness value GV as K + The concentration C curve shows that the brightness response curve is nonlinear. Curve b is the corrected H k / H Cs For signal analysis, the response curve has a good linear relationship.

[0046] ; Formula 1; Where, is the average brightness of the flame image background, is the average brightness of the sample liquid flame image, k It is a coefficient related to the sensitivity of the camera's photosensitive element.

[0047] It should be noted that Formula 1 is only applicable to <220. When it is close to 255, the denominator is 255- As the intensity gradually approaches 0, the measurement error of the corrected light intensity increases. In this case, the sample can be diluted with deionized water, or the sensitivity of the infrared camera can be adjusted to reduce the brightness of the captured image.

[0048] The obtained standard curve is as follows Figure 3 shown.

[0049] The linear range is 10-200 μM, and the limit of detection (LOD) is 1.16 μM based on a three-fold signal-to-noise ratio (S / N=3).

[0050] Example 4 Real sample testing: K in Xiaoqing River + Detection: Sampling points were located in 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 based on the analysis purpose. Before testing, the water samples were filtered through a 0.45 µm filter membrane to remove suspended matter and set aside. 5.00 mL of the filtered water sample, diluted 2-fold, was added with 100 μL of 5.1 mM Cs+ The reference solution was mixed thoroughly; the mixed solution was placed in an atomizer for flame color reaction and the flame image brightness ratio of the sample and the reference was measured. The K value of the water sample was calculated based on the stored calibration curve. + concentration; the final detected concentration was 0.344 ± 0.005 mM, verified by the emission mode of PE-A800, and the measurement result was 0.339 ± 0.002 mM.

[0051] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A portable ratiometric flame photometric analyzer, characterized in that: It includes: The sampling unit is used to inject the sample after atomization; the sample includes a reference element; The flame excitation unit is used to spray flames to excite the element to be detected and the reference element to form a characteristic spectrum, thereby forming an emission spectrum of the flame to be detected; The detection unit is provided with a reflector, a dual-channel filter, and an infrared camera. The reflector images the emission spectrum of the flame to be detected formed by the flame excitation unit to form 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 to obtain the characteristic spectrum of the element to be detected and the characteristic spectrum of the reference element respectively; The infrared camera acquires characteristic spectrum data of the element to be detected and the reference element to form a light signal; Data processing unit; used to process and analyze the optical signal to obtain the concentration of the element to be detected in the sample to be tested.

2. The portable ratiometric flame photometric analyzer according to claim 1, wherein: The detection unit includes a box body and a box cover; A reflector is provided on the inner side wall of the box body, and the top of the reflector is inclined away from the inner side wall to form a limited angle with the inner side wall; The box cover is provided with an infrared camera, which is opposite to the reflector; A dual-channel filter is provided between the infrared camera and the reflector.

3. The portable ratiometric flame photometric analyzer according to claim 1, wherein: The flame ignition unit includes a spray gun lighter; Preferably, the spray gun lighter is a windproof spray gun lighter.

4. The portable ratiometric flame photometric analyzer according to claim 2, wherein: A fixing piece is provided on the inner wall of one side wall of the box body, and the fixing piece fixes the spray gun lighter; Preferably, the nozzle of the spray gun lighter is close to the reflector.

5. The portable ratiometric flame photometric analyzer according to claim 2, wherein: A cooling water tank is provided on the inner wall of the other side wall of the box body; a cooling water tank outlet is provided on the top of the cooling water tank; an exhaust hole is provided on the top of the box body; and the cooling water tank outlet is communicated with the exhaust port.

6. The portable ratiometric flame photometric analyzer according to claim 2, wherein: The sampling unit includes an atomizer and a T-shaped sampling tube; the T-shaped sampling tube includes a first sampling tube and a second sampling tube, the first sampling tube passes through the side wall of the box body and is connected to the atomizer; the second sampling tube is located in the box body; Preferably, a sample outlet is provided on the top of the second sample inlet tube, and the upper portion of the sample outlet is close to the nozzle of a spray gun lighter; Preferably, the sampling unit further comprises a collecting tank; the collecting tank is located in the box body; the bottom of the second sampling tube is inserted into the collecting tank; The collecting tank is connected to the waste liquid tank. Preferably, the first sample inlet tube is tilted downward along the direction of movement of the atomized droplets; Preferably, an adjustment component is provided at the junction of the first sampling tube and the second sampling tube; preferably, the adjustment component includes a glass rod, the top of which is conical; the glass rod is located in the second sampling tube, and the top of the glass rod is located at the junction of the first sampling tube and the second sampling tube; the lower part of the glass rod and the bottom of the second sampling tube are fixed by a rubber stopper.

7. The portable ratiometric flame photometric analyzer according to claim 1, wherein: The infrared camera obtains the intensity of the characteristic spectrum of the element to be detected and the reference element to form a light signal.

8. The portable ratiometric flame photometric analyzer according to claim 1, wherein: The data processing unit includes data transmission lines and chips, smartphones, and computers equipped with data processing functions. Preferably, a chip, smart phone, or computer with data processing capabilities obtains the content of the element to be measured based on the ratio of the flame emission spectrum intensity of the element to be measured to the flame emission spectrum intensity of the reference element and a standard curve.

9. A method for detecting the content of alkali metal or alkaline earth metal elements, characterized in that: The steps include: (1) Add a substance containing a reference element to the sample solution to be tested to form a sample to be tested; (2) Obtaining flame emission spectrum images of the sample to be tested in the visible light and near-infrared light bands; obtaining flame emission spectrum intensity images of the alkali metal or alkaline earth metal 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; (3) The alkali metal or alkaline earth metal element content is obtained based on the ratio of the flame emission spectrum intensity of the alkali metal or alkaline earth metal of the sample to be tested to the flame emission spectrum intensity of the reference element and the standard curve.

10. The method according to claim 9, wherein The reference element is Cs; The alkali metal or alkaline earth metal element includes Rb and K, preferably K.

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