Quantitative detection device for content of pre-reduced indigo

Abstract

The utility model provides a quantitative detection device for the content of pre-reduced indigo, which comprises a box body, a mounting table arranged in the box body, a sample bottle, a titration solution bottle and a magnetic stirrer arranged on the mounting table, a ventilation component arranged in the box body and used for replacing oxygen in the box body, and a reaction bottle arranged on the magnetic stirrer, the sample bottle is connected with the reaction bottle through a feeding pump, a sample is added into the reaction bottle, the titration solution bottle is connected with the reaction bottle through a peristaltic pump, and a solution is added into the reaction bottle, so that the sample and the solution react in the reaction bottle under the action of a magnetic stirrer, and the content of the pre-reduced indigo blue is detected; by arranging the ventilation assembly in the box body, air in the box body is replaced with nitrogen, and it is guaranteed that in the reaction process, it is avoided that reduction indigo is oxidized into indigo through oxygen, measurement of the reduction indigo is interfered, and the test accuracy is affected; a sample and a solution are added into the reaction bottle through the feeding pump and the peristaltic pump, so that the use is more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the technical field of fine chemical analysis and detection, and particularly relates to a quantitative detection device for the content of pre-reduced indigo. Background Technique

[0002] The properties of reduced indigo are different from those of indigo. Therefore, the various detection methods applicable to the content of indigo will not be completely applicable to reduced indigo. And reduced indigo can be rapidly oxidized to indigo in the air, which further brings difficulties to the detection of reduced indigo. Due to the limitation of the reaction, the reduced indigo obtained by hydrogenation reduction and electrochemical reduction often contains a small amount of indigo. There is no conclusion on how to accurately measure the content of reduced indigo in the system. For the gas chromatography and liquid chromatography methods commonly used for indigo detection, they are not applicable to reduced indigo. In the chromatographic column, reduced indigo will be oxidized to indigo, thus losing the chromatographic separation effect.

[0003] Some existing detection techniques for the content of reduced indigo oxidize reduced indigo to indigo and then use the detection methods for indigo for detection. However, this method cannot distinguish between reduced indigo and indigo, resulting in a large error in the test results. In order to better evaluate the quality and reaction efficiency of indigo products produced by the hydrogenation reduction method and the electrochemical reduction method, there is currently a lack of a detection method for the content of reduced indigo solution that does not require pretreatment of reduced indigo and can directly shield the influence of indigo. Content of the Utility Model

[0004] The utility model aims to provide a quantitative detection device for the content of pre-reduced indigo, which can distinguish between indigo and reduced indigo and ensure the accuracy of the measurement results.

[0005] For this purpose, the technical solution adopted by the utility model is: a quantitative detection device for the content of pre-reduced indigo, characterized in that: it includes a box body, an installation table is arranged in the box body, a sample bottle, a titration solution bottle and a reaction bottle are arranged on the installation table, the reaction bottle is equipped with a stirring device, a ventilation component for replacing the oxygen in the box body is arranged in the box body, the sample bottle is connected to the reaction bottle through a feed pump to add a sample into the reaction bottle, the titration solution bottle is connected to the reaction bottle through a peristaltic pump to titrate a solution into the reaction bottle, and a controller for controlling the ventilation of the ventilation component and the feeding of the feed pump and the peristaltic pump is arranged on the box body.

[0006] Further preferably, the stirring device is a magnetic stirrer, and the reaction bottle is placed on the magnetic stirrer. The magnetic stirrer is quieter and more efficient, and has no transmission parts exposed to the outside and is not easily damaged.

[0007] Further preferably, a pH meter and an ORP meter are arranged in the reaction bottle. Arranging a pH meter and an ORP meter in the reaction bottle can real-time measure the pH value and redox potential during the reaction.

[0008] More preferably, the air exchange assembly includes an inlet pipe and an outlet pipe provided on the box body. The inlet pipe is connected to a nitrogen pump, and the outlet pipe is communicated with the atmosphere. Before the reaction, nitrogen is introduced into the box body to displace the oxygen in the box body, ensuring that oxygen will not interfere with the reaction during the reaction.

[0009] More preferably, valves are provided on both the inlet pipe and the outlet pipe, and the valves are connected to the valve control end of the controller. By controlling the opening or closing of the valves through the controller, the gas replacement in the box body can be controlled, which is more convenient.

[0010] More preferably, a detector for detecting the oxygen concentration in the box body is provided in the box body. Detect the oxygen concentration in the box body. After the oxygen is displaced from the box body, the reaction is carried out to avoid the influence of indigo on the measurement of reduced indigo.

[0011] More preferably, a box cover is provided above the box body, and an observation window is provided at the position of the box body corresponding to the reaction flask. When the samples or titration solutions in the box body are used up, the box cover can be opened to add them into the box body, and the observation window can observe the situation in the reaction flask, making it more convenient to use.

[0012] More preferably, both the peristaltic pump and the feed pump are metering pumps. The metering pump can control the flow rate and the added amount of the feed, which is convenient for measurement.

[0013] The beneficial effects of the present utility model: By providing an air exchange assembly in the box body, the air in the box body is displaced and replaced with nitrogen, ensuring that during the reaction, oxygen will not oxidize reduced indigo to indigo, thereby interfering with the measurement of reduced indigo and affecting the accuracy of the experiment; By providing a feed pump and a peristaltic pump to automatically add samples and titration solutions into the reaction flask respectively, during the measurement of reduced indigo, the automatic quantitative addition of samples and titration solutions can be ensured, making it more convenient and faster to use. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model. Detailed Embodiments

[0015] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0016] As Figure 1 shown, a quantitative detection device for the content of pre-reduced indigo includes a box body 9. An installation table 13 is provided in the box body 9, and a box cover is provided above the box body 9. When the samples or solutions in the box body 9 are used up, the box cover can be opened to add them into the box body 9, making it more convenient to use.

[0017] A sample bottle 7, a titrant solution bottle 8 and a reaction bottle 14 are arranged on the mounting table 13. A pH meter 4 and an ORP meter 5 are arranged inside the reaction bottle 14. By arranging the pH meter 4 and the ORP meter 5 inside the reaction bottle 14, the pH value and the oxidation-reduction potential during the reaction can be measured in real time. An observation window is arranged on the box body 9 at a position corresponding to the reaction bottle 14. The observation window can observe the situation inside the reaction bottle 14.

[0018] The reaction bottle 14 is equipped with a stirring device, and the stirring device is a magnetic stirrer 1. The reaction bottle 14 is placed on the magnetic stirrer 1. The magnetic stirrer 1 is quieter and more efficient, and has no transmission parts exposed to the outside, so it is not easily damaged. Of course, the magnetic stirrer 1 can also be not used, and other mechanical stirring can be adopted.

[0019] An air exchange component for replacing the oxygen inside the box body 9 is arranged inside the box body 9. The air exchange component includes an air inlet pipe 10 and an air outlet pipe 11 arranged on the box body 9. The air inlet pipe 10 is connected with a nitrogen pump, and the air outlet pipe 11 is communicated with the atmosphere. Before the reaction, nitrogen is introduced into the box body 9 to replace the oxygen inside the box body 9, so as to ensure that oxygen will not interfere with the reaction during the reaction. Valves are arranged on both the air inlet pipe 10 and the air outlet pipe 11, and the valves are connected with the valve control end of the controller 12. By controlling the opening or closing of the valve 12 through the controller, the gas replacement inside the box body 9 can be controlled, which is more convenient.

[0020] The sample bottle 7 is connected with the reaction bottle 14 through a feed pump 2 to add a sample into the reaction bottle 14. The titrant solution bottle 8 is connected with the reaction bottle 14 through a peristaltic pump 3 to add a solution into the reaction bottle 14. The titrant solution such as potassium ferricyanide solution is added, so that the sample and the solution react in the reaction bottle 14 under the action of the magnetic stirrer 1, thereby detecting the content of pre-reduced indigo. Both the peristaltic pump 3 and the feed pump 8 are metering pumps. The metering pump can control the feeding flow rate and the added amount, which is convenient for measurement. This metering pump is a prior art and will not be elaborated here.

[0021] A detector 15 for detecting the oxygen concentration inside the box body 9 is arranged inside the box body 9. The oxygen concentration inside the box body 9 is detected. After the oxygen inside the box body 9 is completely replaced, the reaction is carried out to avoid the influence of indigo on the measurement of reduced indigo.

[0022] By arranging an air exchange component inside the box body 9 to replace the air inside the box body 9 with nitrogen, it is ensured that during the reaction, no oxygen will oxidize reduced indigo to indigo, thereby interfering with the measurement of reduced indigo and affecting the accuracy of the test; by arranging the feed pump 2 and the peristaltic pump 3 to add the sample and the solution into the reaction bottle 14 respectively, during the measurement of reduced indigo, the quantitative addition of the sample and the solution can be ensured, and only the sample and the solution need to be added, which is more convenient and fast.

[0023] In this embodiment, the feeding amount of the feeding pump 2 is set to 20 g, and the feeding speed of the peristaltic pump 3 is set to 0.1 ml / s. After adding the sample and the titration solution into the sample bottle 7 and the titration solution bottle 8 respectively, place the magnetic stirrer 6 in the reaction bottle 14. Control the air exchange component by the controller 12 to replace the air in the box body 9 with nitrogen, and add the sample and the titration solution into the reaction bottle 14 through the feeding pump 2 and the peristaltic pump 3. Start the magnetic stirrer 1 to make the sample and the titration solution react in the reaction bottle 14. Calculate according to the measured value of the pH meter 4, and calculate the redox potential corresponding to the pH value through the formula OPR = -47.06×pH + 506.11. When the calculated value is the same as the measured value of the ORP meter 5, turn off the peristaltic pump 3, and calculate the concentration of the reduced indigo according to the amount of the solution dropped by the peristaltic pump 3.

[0024] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A quantitative detection device for pre-reduced indigo content, characterized in that: The invention comprises a box (9), wherein a mounting platform (13) is arranged in the box (9), and a sample bottle (7), a titration solution bottle (8) and a reaction bottle (14) are arranged on the mounting platform (13), and the reaction bottle (14) is equipped with a stirring device. A ventilation component for replacing oxygen in the box (9) is arranged in the box (9), and the sample bottle (7) is connected to the reaction bottle (14) through a feed pump (2), and a sample is added to the reaction bottle (14); the titration solution bottle (8) is connected to the reaction bottle (14) through a peristaltic pump (3), and a titration solution is added to the reaction bottle (14); and a controller (12) for controlling the ventilation of the ventilation component and the feeding of the feed pump (2) and the peristaltic pump (3) is arranged on the box (9).

2. The quantitative detection device for the content of pre-reduced indigo according to claim 1, characterized in that: The stirring device is a magnetic stirrer (1), and the reaction bottle (14) is placed on the magnetic stirrer (1).

3. The quantitative detection device for the content of pre-reduced indigo according to claim 1, characterized in that: The reaction bottle (14) is provided with a pH meter (4) and an ORP meter (5).

4. The quantitative detection device for the content of pre-reduced indigo according to claim 1, characterized in that: The ventilation assembly comprises an air inlet pipe (10) and an air outlet pipe (11) arranged on the box body (9); the air inlet pipe (10) is connected to a nitrogen pump, and the air outlet pipe (11) is connected to the atmosphere.

5. A quantitative detection device for the content of pre-reduced indigo according to claim 4, characterized in that: The air inlet pipe (10) and the air outlet pipe (11) are both provided with valves, and the valves are connected to the valve control end of the controller (12).

6. A quantitative detection device for the content of pre-reduced indigo according to claim 5, characterized in that: A detector (15) for detecting the oxygen concentration in the box (9) is arranged in the box (9).

7. A quantitative detection device for the content of pre-reduced indigo according to claim 6, characterized in that: A box cover is arranged above the box body (9), and an observation window is arranged on the box body (9) at a position corresponding to the reaction bottle (14).

8. The quantitative detection device for the content of pre-reduced indigo according to any one of claims 1 to 7, characterized in that: The peristaltic pump (3) and the feed pump (2) are both metering pumps.

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