Chromium content determination analyzer

Abstract

The utility model discloses a chromium content determination analyzer, which comprises a detection module provided with a sample chamber and a waste liquid discharge channel used for discharging waste liquid in the sample chamber; the first reaction module is provided with a first reaction chamber and a first conveying channel, and the first conveying channel is communicated with the first reaction chamber and the sample chamber; the second reaction module is provided with a second reaction chamber and a second conveying channel, the second conveying channel is communicated with the second reaction chamber and the sample chamber, and the measuring efficiency of the total chromium content and the hexavalent chromium content in the sample is greatly improved; and the controllable light device intelligently adjusts the light intensity to ensure that the light intensity received by the photoelectric sensor is always in the most sensitive and accurate light intensity range, so that the detection accuracy of the sample is improved.

Description

Technical Field

[0001] This utility model relates to the field of chromium content determination technology, and in particular to a chromium content determination analyzer. Background Technology

[0002] Chromium and its compounds have wide industrial applications. Industries such as metallurgy, chemical engineering, mineral engineering, electroplating, chromium production, pigments, pharmaceuticals, light industry and textiles, and the production of chromium salts and chromium compounds all generate large amounts of chromium-containing wastewater. Chromium compounds exist in the forms of divalent chromium (e.g., CrCl2), trivalent chromium (e.g., Cr2O3), and hexavalent chromium (e.g., K2Cr2O7), but trivalent and hexavalent compounds are the most common. Existing industry standards generally require the determination of hexavalent chromium content and total chromium content in wastewater. Currently, this requires the use of two analyzers to determine the hexavalent chromium content and total chromium content in wastewater separately, which is inefficient. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a chromium content analyzer in which the materials required for the determination of total chromium content and hexavalent chromium content are prepared simultaneously, and the determination of hexavalent chromium in the second material is completed during the generation of the first material, while the sample chamber of the detection module is cleaned, greatly improving the efficiency of determining the total chromium content and hexavalent chromium content in the sample.

[0004] The chromium content analyzer according to an embodiment of the present invention includes:

[0005] The detection module is equipped with a sample chamber and a waste liquid discharge channel, wherein the waste liquid discharge channel is used to discharge the waste liquid from the sample chamber;

[0006] The first reaction module is provided with a first reaction chamber and a first conveying channel, the first conveying channel connecting the first reaction chamber and the sample chamber;

[0007] The second reaction module is provided with a second reaction chamber and a second conveying channel, the second conveying channel connecting the second reaction chamber and the sample chamber;

[0008] Cleaning solution container;

[0009] The pipetting module is equipped with a sample cleaning and conveying channel, which is used to convey the cleaning solution from the cleaning solution container to the sample chamber.

[0010] The detection module measures the total chromium content and hexavalent chromium content of the liquid in the sample chamber at different time periods.

[0011] The chromium content analyzer according to the embodiments of this utility model has at least the following beneficial effects: the first reaction module and the second reaction module prepare two samples from the same source, respectively. In one reaction chamber, the sample, acid solution, and sodium persulfate solution are added and mixed, and then subjected to high-temperature digestion. After the high-temperature digestion is completed, diphenylcarbazide colorimetric reagent is added to react and generate the first material. In the other reaction chamber, the sample, acid solution, and diphenylcarbazide colorimetric reagent are added and mixed, and then subjected to react and generate the second material. Since the generation time of the second material is shorter than that of the first material, the second material is transported to the sample chamber during the generation of the first material. Then, the detection module determines the hexavalent chromium content of the second material. The sample cleaning and conveying channel of the pipetting module rinses the second material in the sample chamber with the cleaning solution from the cleaning solution container, cleaning the sample chamber. The first material generated afterward is then conveyed to the cleaned sample chamber. The detection module determines the total chromium content of the first material. Thus, the total chromium content and hexavalent chromium content of the sample can be determined. The materials required for the determination of total chromium content and hexavalent chromium content are prepared simultaneously, and the determination of hexavalent chromium in the second material and the cleaning of the sample chamber of the detection module are completed during the generation of the first material, which greatly improves the determination efficiency of total chromium content and hexavalent chromium content in the sample.

[0012] According to some embodiments of the present invention, the first reaction time of the first material in the first reaction chamber is greater than the second reaction time of the second material in the second reaction chamber.

[0013] According to some embodiments of the present invention, the first material and the second material begin to react at the same time.

[0014] According to some embodiments of the present invention, the difference between the first reaction time and the second reaction time is an interval time, during which the detection module measures the hexavalent chromium content of the second material.

[0015] According to some embodiments of the present invention, during the interval, the sample cleaning and conveying channel delivers the cleaning solution to the sample chamber, and the waste liquid discharge channel discharges the waste liquid from the sample chamber.

[0016] According to some embodiments of the present invention, the chromium content analyzer further includes a sample container, an acid container, a colorimetric reagent container, and a reaction solution container;

[0017] The pipetting module also includes:

[0018] A sample transport channel transports the sample from the sample container to the first reaction chamber and the second reaction chamber;

[0019] An acid delivery channel transports the acid from the acid container to the first reaction chamber and the second reaction chamber, respectively.

[0020] The color developer delivery channel delivers the color developer from the color developer container to the first reaction chamber and the second reaction chamber, respectively.

[0021] The reaction liquid delivery channel delivers the reaction liquid from the reaction liquid container to the first reaction chamber.

[0022] According to some embodiments of the present invention, the acid container, the color developer container, the reaction liquid container, and the cleaning liquid container are each equipped with a liquid level sensor.

[0023] According to some embodiments of the present invention, the detection module further includes a monochromatic light source, a controllable light device, and a photoelectric sensor. The monochromatic light source and the photoelectric sensor are respectively disposed on two opposite sides of the sample chamber. The controllable light device is disposed between the monochromatic light source and the sample chamber, and the controllable light device adjusts the intensity of the light entering the sample chamber.

[0024] According to some embodiments of the present invention, the controllable light device includes one of a variable aperture, a controllable aperture, an electronic light shield, and a controllable light shield.

[0025] According to some embodiments of this utility model, the pipetting module further includes:

[0026] The first cleaning fluid delivery channel delivers the cleaning fluid from the cleaning fluid container to the first reaction chamber;

[0027] The second cleaning fluid delivery channel delivers the cleaning fluid from the cleaning fluid container to the second reaction chamber. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a chromium content determination and analysis instrument according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the detection module in one embodiment of the present invention.

[0030] Reference numerals: Detection module 100, Sample chamber 110, Waste liquid discharge channel 120, Monochromatic light source 130, Controllable light device 140, Photoelectric sensor 150, First reaction module 200, First reaction chamber 210, First conveying channel 220, Second reaction module 300, Second reaction chamber 310, Second conveying channel 320, Pipette module 400, Sample cleaning conveying channel 410, First cleaning solution conveying channel 411, Second cleaning solution conveying channel 412, Sample conveying channel 420, Acid conveying channel 430, Color developer conveying channel 440, Reaction liquid conveying channel 450, Waste liquid container 500, Cleaning solution container 510, Sample container 520, Acid container 530, Color developer container 540, Reaction liquid container 550, Liquid level sensor 600. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms front, back, up, down, axial, circumferential, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0034] In the description of this utility model, it should be noted that terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.

[0036] Reference Figures 1 to 2As shown in the figure, this utility model embodiment provides a chromium content determination analyzer.

[0037] Reference Figure 1 As shown, the chromium content analyzer includes a detection module 100, a first reaction module 200, a second reaction module 300, a pipetting module 400, a waste liquid container 500, a cleaning liquid container 510, a sample container 520, an acid container 530, a colorimetric reagent container 540, a reaction liquid container 550, and multiple liquid level sensors 600.

[0038] The first reaction module 200 is provided with a first reaction chamber 210, the second reaction module 300 is provided with a second reaction chamber 310, and the pipetting module 400 includes a sample transport channel 420, an acid transport channel 430, a colorimetric reagent transport channel 440, and a reaction solution transport channel 450.

[0039] The first reaction module 200 is further equipped with a first heating device, a first temperature sensor, and a first cooling device. The first heating device heats the first reaction chamber 210 to create a high-temperature environment required for the digestion reaction. The first cooling device cools the first reaction chamber 210 so that the cooled liquid can enter the subsequent detection module 100. The first temperature sensor is located in the first reaction chamber 210 and is used to monitor the temperature in the first reaction chamber 210 to determine the reaction status of the liquid in the first reaction chamber 210 based on the temperature.

[0040] The second reaction module 300 is further equipped with a second heating device, a second temperature sensor, and a second cooling device. The second heating device heats the second reaction chamber 310 to create the high-temperature environment required for the digestion reaction. The second cooling device cools the second reaction chamber 310 so that the cooled liquid can enter the subsequent detection module 100. The second temperature sensor is located in the second reaction chamber 310 and is used to monitor the temperature in the second reaction chamber 310 to determine the reaction status of the liquid in the second reaction chamber 310 based on the temperature.

[0041] The inlet end of the sample transport channel 420 is connected to the sample container 520, and the outlet end of the sample transport channel 420 is connected to the first reaction chamber 210 and the second reaction chamber 310. The sample transport channel 420 transports samples to the first reaction chamber 210 and the second reaction chamber 310 respectively.

[0042] The sample container 520 is equipped with a liquid level sensor 600, which is used to detect the sample liquid level in the sample container 520 so as to monitor the remaining sample in the sample container 520 at all times.

[0043] The inlet end of the acid delivery channel 430 is connected to the acid container 530, and the outlet end of the acid delivery channel 430 is connected to the first reaction chamber 210 and the second reaction chamber 310. The acid delivery channel 430 delivers acid to the first reaction chamber 210 and the second reaction chamber 310 respectively.

[0044] The acid container 530 is equipped with a liquid level sensor 600, which is used to detect the acid level in the acid container 530 so as to monitor the remaining acid in the acid container 530 at all times.

[0045] The inlet end of the color developer delivery channel 440 is connected to the color developer container 540, and the outlet end of the color developer delivery channel 440 is connected to the first reaction chamber 210 and the second reaction chamber 310. The color developer delivery channel 440 delivers color developer to the first reaction chamber 210 and the second reaction chamber 310 respectively.

[0046] The color developer container 540 is equipped with a liquid level sensor 600, which is used to detect the liquid level of the color developer in the color developer container 540 so as to monitor the remaining amount of color developer in the color developer container 540 at all times.

[0047] The inlet end of the reaction liquid delivery channel 450 is connected to the reaction liquid container 550, and the outlet end of the reaction liquid delivery channel 450 is connected to the first reaction chamber 210 and the second reaction chamber 310. The reaction liquid delivery channel 450 delivers the reaction liquid to the first reaction chamber 210.

[0048] The reaction liquid container 550 is equipped with a liquid level sensor 600, which is used to detect the liquid level of the reaction liquid in the reaction liquid container 550 so as to monitor the remaining amount of reaction liquid in the reaction liquid container 550 at all times.

[0049] Detection module 100 is a spectrophotometric detection module. The detection principle is as follows:

[0050] The principle of total chromium detection: In an acidic solution medium, under certain temperature and pressure, chromium in different valence states and forms in the sample is oxidized to hexavalent chromium by persulfate or permanganate. Hexavalent chromium ions react with diphenylcarbazide to form a purple-red complex, which is then measured spectrophotometrically at a wavelength of 540 nm. By measuring the absorbance, the total chromium content in the sample can be indirectly obtained.

[0051] The principle of hexavalent chromium detection: In an acidic solution medium, hexavalent chromium reacts with diphenylcarbazide to produce a purple-red compound. The absorbance is measured at a wavelength of 540 nm. Within a certain range, the concentration of hexavalent chromium in the sample has a linear relationship with its corresponding absorbance, thus obtaining the content of hexavalent chromium in the sample.

[0052] The detection module 100 is provided with a sample chamber 110. The first reaction module 200 is also provided with a first conveying channel 220, which connects the first reaction chamber 210 and the sample chamber 110. The second reaction module 300 is also provided with a second conveying channel 320, which connects the second reaction chamber 310 and the sample chamber 110. The first conveying channel 220 is used to convey the liquid in the first reaction chamber 210 to the sample chamber 110, and the second conveying channel 320 is used to convey the liquid in the second reaction chamber 310 to the sample chamber 110.

[0053] The detection module 100 is also equipped with a waste liquid discharge channel 120, which connects the sample chamber 110 and the waste liquid container 500. The waste liquid discharge channel 120 is used to discharge the waste liquid in the sample chamber 110 into the waste liquid container 500. The waste liquid container 500 is equipped with a liquid level sensor 600, which detects the liquid level of the waste liquid in the waste liquid container 500 to remind the experimenter to discharge the waste liquid in the waste liquid container 500 in a timely manner.

[0054] The pipetting module 400 is also provided with a sample cleaning and transport channel 410, a first cleaning solution transport channel 411, and a second cleaning solution transport channel 412.

[0055] The inlet end of the sample cleaning transport channel 410 is connected to the cleaning liquid container 510, and the outlet end of the sample cleaning transport channel 410 is connected to the sample chamber 110. The sample cleaning transport channel 410 is used to transport the cleaning liquid in the cleaning liquid container 510 to the sample chamber 110 so that the cleaning liquid can rinse the sample chamber 110.

[0056] The inlet end of the first cleaning fluid delivery channel 411 is connected to the cleaning fluid container 510, and the outlet end of the first cleaning fluid delivery channel 411 is connected to the first reaction chamber 210. The first cleaning fluid delivery channel 411 is used to deliver the cleaning fluid in the cleaning fluid container 510 to the first reaction chamber 210, so that the cleaning fluid rinses the first reaction chamber 210. Then the cleaning fluid is delivered to the sample chamber 110 through the first delivery channel 220 to rinse the first delivery channel 220. The cleaning fluid then enters the sample chamber 110 to clean the sample chamber 110. Finally, the cleaning fluid is discharged from the waste liquid discharge channel 120 to the waste liquid container 500.

[0057] The cleaning fluid delivered by the first cleaning fluid delivery channel 411 can rinse the first reaction chamber 210, the first delivery channel 220 and the sample chamber 110, so that the first reaction chamber 210 can react with the next sample.

[0058] The inlet end of the second cleaning fluid delivery channel 412 is connected to the cleaning fluid container 510, and the outlet end of the second cleaning fluid delivery channel 412 is connected to the second reaction chamber 310. The second cleaning fluid delivery channel 412 is used to deliver the cleaning fluid in the cleaning fluid container 510 to the second reaction chamber 310, so that the cleaning fluid rinses the second reaction chamber 310. Then the cleaning fluid is delivered to the sample chamber 110 through the second delivery channel 320 to rinse the second delivery channel 320. The cleaning fluid then enters the sample chamber 110 to clean the sample chamber 110. Finally, the cleaning fluid is discharged from the waste liquid discharge channel 120 to the waste liquid container 500.

[0059] The cleaning fluid delivered by the second cleaning fluid delivery channel 412 can rinse the second reaction chamber 310, the second delivery channel 320 and the sample chamber 110, so that the second reaction chamber 310 can react with the next sample.

[0060] In this embodiment, the cleaning solution in the cleaning solution container 510 is pure water.

[0061] When it is necessary to replace the sample in the sample container 520, the sample transport channel 420 in the pipetting module 400 needs to be cleaned. Therefore, the sample in the sample container 520 can be replaced with cleaning solution or pure water. The cleaning solution or pure water in the sample container 520 is transported to the first reaction chamber 210 and the second reaction chamber 310 through the sample transport channel 420 to rinse the sample container 520 and the sample transport channel 420.

[0062] In some embodiments, the pipetting module 400 may also be provided with a third cleaning fluid delivery channel, which connects the cleaning fluid container 510 and the sample container 520. After the sample in the sample container 520 is emptied, the third cleaning fluid delivery channel is activated to deliver the cleaning fluid in the cleaning fluid container 510 to the sample container 520. The cleaning fluid rinses the sample container 520. Then, the sample delivery channel 420 delivers the cleaning fluid in the sample container 520 to the first reaction chamber 210 and the second reaction chamber 310, thereby rinsing the sample container 520 and the sample delivery channel 420.

[0063] The first reaction module 200 and the second reaction module 300 prepare two samples from the same source, respectively. The first reaction module 200 prepares the sample into a first material, and the second reaction module 300 prepares the sample into a second material. The first material is used to determine the total chromium content, and the second material is used to determine the hexavalent chromium content.

[0064] In this embodiment, the reaction solution is sodium persulfate solution, and the colorimetric reagent is diphenylcarbazide solution.

[0065] The sample transport channel 420 transports the sample in the sample container 520 to the first reaction chamber 210 and the second reaction chamber 310 respectively. Then, the acid transport channel 430 transports the acid in the acid container 530 to the first reaction chamber 210 and the second reaction chamber 310 respectively, so that the acid is mixed with the sample.

[0066] Then, the reaction liquid delivery channel 450 delivers the reaction liquid in the reaction liquid container 550 to the first reaction chamber 210, while at the same time, the colorimetric reagent delivery channel 440 delivers the colorimetric reagent in the colorimetric reagent container 540 to the second reaction chamber 310; therefore, the sample, acid, and sodium persulfate solution in the first reaction chamber 210 are mixed and then subjected to high-temperature digestion, while the sample, acid, and diphenylcarbazide colorimetric reagent in the second reaction chamber 310 are mixed to generate the second material.

[0067] The second material is transported to the sample chamber 110 by the second conveying channel 320. The detection module determines the hexavalent chromium content of the second material. The sample cleaning conveying channel 410 of the pipetting module 400 rinses the second material in the sample chamber 110 with the cleaning solution in the cleaning solution container 510 to clean the sample chamber 110. At the same time, after the digestion reaction in the first reaction chamber 210, the colorimetric reagent conveying channel 440 transports the colorimetric reagent in the colorimetric reagent container 540 to the first reaction chamber 210, causing the liquid in the first reaction chamber 210 to generate the first material.

[0068] Finally, the first material is transported to the cleaned sample chamber 110, where the detection module 100 determines the total chromium content of the first material.

[0069] Therefore, the materials required for the determination of total chromium content and hexavalent chromium content are prepared simultaneously, and the determination of hexavalent chromium in the second material is completed during the generation of the first material, and the sample chamber 110 of the detection module 100 is cleaned, which greatly improves the determination efficiency of total chromium content and hexavalent chromium content in the sample.

[0070] In this embodiment, the second reaction time for generating the second material in the second reaction chamber 310 is less than the first reaction time required for generating the first material in the first reaction chamber 210.

[0071] Therefore, during the first reaction time when the first material is generated, the second reaction chamber 310 generates the second material, and the second conveying channel 320 conveys the second material to the sample chamber 110 of the detection module 100 for determination of hexavalent chromium content. The cleaning solution in the cleaning solution container 510 can also be conveyed to the sample chamber 110 through the sample cleaning conveying channel 410 of the pipetting module 400, and the cleaning solution cleans the sample chamber 110.

[0072] In some embodiments, the first reaction chamber 210 and the second reaction chamber 310 are added to the sample and acid solution at the same time, respectively, and the first reaction chamber 210 is added to the reaction solution, while the second reaction chamber 310 is added to the colorimetric reagent.

[0073] By controlling the timing of the addition of the sample, acid, reaction solution, and colorimetric reagent to the first reaction chamber 210 and the second reaction chamber 310, the first reaction chamber 210 and the second reaction chamber 310 can begin to react at the same time.

[0074] The time required to generate the first material is called the first reaction time, and the time required to generate the second material is called the second reaction time. The difference between the first reaction time and the second reaction time is the interval time.

[0075] During the interval, the second conveying channel 320 conveys the second material to the sample chamber 110 of the detection module 100 for hexavalent chromium content determination. Then, the sample cleaning conveying channel 410 conveys the cleaning liquid in the cleaning liquid container 510 to the sample chamber 110, and the cleaning liquid cleans the sample chamber 110. Finally, the waste liquid discharge channel 120 discharges the waste liquid in the sample chamber 110 into the waste liquid container 500.

[0076] Reference Figure 2 As shown, the detection module 100 also includes a monochromatic light source 130, a controllable light device 140, and a photoelectric sensor 150.

[0077] Monochromatic light source 130 and photoelectric sensor 150 are respectively arranged on opposite sides of sample chamber 110, which is a quartz or glass cuvette. Monochromatic light source 130 is a combination of light source and monochromator, emitting monochromatic light with a wavelength of 540nm. The function of controllable light device 140 is to intelligently adjust the light intensity to ensure that the light intensity received by photoelectric sensor 150 is always within the most sensitive and accurate light intensity range, thereby helping to improve the detection accuracy of the detection module 100. Specific components of controllable light device 140 include variable aperture, controllable aperture, electronic light shield, and controllable light shield.

[0078] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A chromium content determination analyzer characterized by, include: The detection module is equipped with a sample chamber and a waste liquid discharge channel, wherein the waste liquid discharge channel is used to discharge the waste liquid from the sample chamber; The first reaction module is provided with a first reaction chamber and a first conveying channel, the first conveying channel connecting the first reaction chamber and the sample chamber; The second reaction module is provided with a second reaction chamber and a second conveying channel, the second conveying channel connecting the second reaction chamber and the sample chamber; Cleaning solution container; The pipetting module is equipped with a sample cleaning and conveying channel, which is used to convey the cleaning solution from the cleaning solution container to the sample chamber. The detection module measures the total chromium content and hexavalent chromium content of the liquid in the sample chamber at different time periods.

2. The chromium content determination analyzer according to claim 1, characterized in that, The first reaction time of the first material in the first reaction chamber is greater than the second reaction time of the second material in the second reaction chamber.

3. The chromium content determination analyzer according to claim 2, characterized in that, The first material and the second material begin to react at the same time.

4. The chromium content determination analyzer according to claim 3, characterized in that, The difference between the first reaction time and the second reaction time is the interval time, during which the detection module measures the hexavalent chromium content of the second material.

5. The chromium content determination analyzer according to claim 4, characterized in that, During the specified interval, the sample cleaning and conveying channel delivers the cleaning solution to the sample chamber, and the waste liquid discharge channel discharges the waste liquid from the sample chamber.

6. The chromium content determination analyzer of claim 1, wherein, The chromium content analyzer also includes a sample container, an acid container, a colorimetric reagent container, and a reaction solution container; The pipetting module also includes: A sample transport channel transports the sample from the sample container to the first reaction chamber and the second reaction chamber; An acid delivery channel transports the acid from the acid container to the first reaction chamber and the second reaction chamber, respectively. The color developer delivery channel delivers the color developer from the color developer container to the first reaction chamber and the second reaction chamber, respectively. The reaction liquid delivery channel delivers the reaction liquid from the reaction liquid container to the first reaction chamber.

7. The chromium content determination analyzer according to claim 6, characterized in that, The acid container, the color developer container, the reaction liquid container, and the cleaning liquid container are each equipped with a liquid level sensor.

8. The chromium content determination analyzer of claim 1, wherein, The detection module also includes a monochromatic light source, a controllable light device, and a photoelectric sensor. The monochromatic light source and the photoelectric sensor are respectively located on two opposite sides of the sample chamber. The controllable light device is located between the monochromatic light source and the sample chamber, and the controllable light device adjusts the intensity of the light entering the sample chamber.

9. The chromium content determination analyzer according to claim 8, characterized in that, The controllable light device includes one of the following: a variable aperture, a controllable aperture, an electronic light shield, and a controllable light shield.

10. The chromium content analyzer according to claim 1, characterized in that, The pipetting module also includes: The first cleaning fluid delivery channel delivers the cleaning fluid from the cleaning fluid container to the first reaction chamber; The second cleaning fluid delivery channel delivers the cleaning fluid from the cleaning fluid container to the second reaction chamber.

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