CN215678255U - Experimental device for titration method survey aquatic chemical oxygen demand - Google Patents
Experimental device for titration method survey aquatic chemical oxygen demand Download PDFInfo
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- CN215678255U CN215678255U CN202122188716.7U CN202122188716U CN215678255U CN 215678255 U CN215678255 U CN 215678255U CN 202122188716 U CN202122188716 U CN 202122188716U CN 215678255 U CN215678255 U CN 215678255U
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Abstract
The utility model relates to an experimental device for determining chemical oxygen demand in water by a titration method, and belongs to the technical field of water quality analysis. This experimental apparatus includes COD detection case and titrator, and the COD detection case includes box, heating pipe, electromagnetic stirring platform and temperature and stirring speed controller, and the electromagnetic stirring platform sets up in the bottom of box, and the heating pipe setting is in the lower part of box, and temperature and stirring speed controller set up the one side outside the box, and electromagnetic stirring platform and heating pipe are connected through control scheme between temperature and the stirring speed controller separately. The device can directly titrate in situ, avoids the danger caused by high-temperature operation, can accurately control to titrate at high temperature at the same temperature and the same stirring speed, eliminates the error caused by temperature reduction and inconsistent manual shaking speed in the detection process of the sample, and improves the accuracy of the detection result.
Description
Technical Field
The utility model relates to an experimental device for determining chemical oxygen demand in water by a titration method, and belongs to the technical field of water quality analysis.
Background
Chemical Oxygen Demand (COD) is the amount of a strong oxidant consumed when a water sample is treated by the strong oxidant under a certain condition, and is expressed by the mass concentration of oxygen, so that the COD is an important index for evaluating the pollution degree of a water body and an important project for monitoring water quality.
The main detection steps for measuring COD in water by the existing literature and national and industrial standard methods are as follows: boiling the conical flask filled with the sample and the strong oxidant by using an electric furnace, transferring the conical flask into a water bath pot for heating, taking out after heating for 30 minutes, adding another reducing reagent for manually shaking up, and then shaking the conical flask by using a hand to titrate while the conical flask is hot so as to determine the concentration of COD in the sample. The technology has the defects of complex operation link, low efficiency, large manual operation error and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an experimental device for measuring chemical oxygen demand in water by a titration method. The utility model provides an experimental device for measuring the chemical oxygen demand in water by a titration method, and aims to solve the problems that the existing chemical oxygen demand test method has some defects, such as titration error caused by manual shaking, danger caused by high-temperature operation, and error caused by temperature reduction and inconsistent manual shaking speed, so that the accuracy of a detection result is influenced.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides an experimental apparatus for titration survey aquatic chemical oxygen demand, includes COD detection case and titrator etc, COD detection case include box, heating pipe, electromagnetic stirring platform and temperature and stirring speed controller etc. the electromagnetic stirring platform set up the bottom at the box, the heating pipe set up the lower part in the box, temperature and stirring speed controller set up the one side outside the box, electromagnetic stirring platform and heating pipe respectively and through (built-in) control scheme connection between temperature and the stirring speed controller.
Preferably, the electromagnetic stirring table is used as a lower bottom plate of the box body.
Preferably, the temperature and stirring speed controller is provided with a temperature and stirring speed display screen, a temperature control knob, an electromagnetic stirring speed control knob and the like.
Preferably, the box body further comprises a top plate (an upper bottom plate) and a heat preservation cover, wherein the top plate is provided with a plurality of working holes for fixing and supporting experimental utensils such as conical bottles, beakers and the like; the heat preservation cover consists of a circular ring and a circular cover, the diameter of the circular cover is slightly larger than the inner diameter of the circular ring and smaller than the outer diameter of the circular ring, and the circular cover is placed on the circular ring to form a complete circular cover; the heat preservation cover is matched with the size of the working hole in the top plate, and the heat preservation cover covers the unused working hole to play a role in heat preservation.
Preferably, the box body is made of high-light-transmission and high-temperature-resistant materials except for the lower bottom plate, so that the titrator can be used for carrying out titration in situ and observing the color change of the solution in real time.
Preferably, the high-light-transmission high-temperature-resistant material is a transparent high-temperature-resistant resin material, and comprises a transparent high-temperature-resistant modified polysulfone material and the like.
Preferably, the electromagnetic stirring table is also provided with a rotor, the outer surface skin material of the rotor is a polytetrafluoroethylene material, and the rotor is placed in an experimental vessel containing a sample to realize a stirring function.
During operation, adding ultrapure water into the box of COD detection case, during the erlenmeyer flask was put into to the sample, the erlenmeyer flask was put into the working hole of roof, was added the rotor in the erlenmeyer flask when needs, and the temperature in the temperature and the control of speed stirring controller show the detection case to and control and show the rotational speed of rotor in the erlenmeyer flask, thereby make the titrator titrate in-process liquid at the uniform velocity and rotate, and can adjust to best rotational speed.
The utility model has the advantages that:
the electromagnetic stirring controller in the device replaces the manual shaking operation, so that the titration error caused by the manual shaking is solved, the steps of transferring the conical flask out of the water bath and then titrating are simplified by the transparent box body and the electromagnetic stirring controller, the titration can be directly performed in the COD detection box, the time is saved, the detection efficiency is improved, the danger caused by high-temperature operation is avoided, the accurate control can be performed at high temperature at the same temperature and at the same stirring speed, the titration is performed, the error caused by inconsistent temperature reduction and manual shaking speed in the detection process of the sample is eliminated, and the accuracy of the detection result is improved.
The device simplifies the step of transferring the conical flask out of the water bath and then shaking up manually for titration, can directly titrate in situ, avoids the danger caused by high-temperature operation, can accurately control the titration at high temperature and at the same temperature and the same stirring speed, eliminates the errors caused by temperature reduction and inconsistent manual shaking speed in the detection process of the sample, and improves the accuracy of the detection result.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus for determining chemical oxygen demand in water by a titration method according to the present invention.
Description of the main reference numerals:
1 COD detection box 2 titrator
11 transparent box body 12 heating pipe
13 electromagnetic stirring table 14 temperature and stirring speed controller
15 temperature and stirring speed display screen 16 temperature control knob
17 electromagnetic stirring speed control knob 18 heat preservation lid
19 titration flask
Detailed Description
As shown in FIG. 1, the experimental device for determining chemical oxygen demand in water by titration method of the present invention comprises a COD detection box 1, a titrator 2, a titration flask 19 (conical flask), a rotor, etc., wherein the COD detection box 1 comprises a transparent box body 11, a heating pipe 12, an electromagnetic stirring table 13, a temperature and stirring speed controller 14, etc., the electromagnetic stirring table 13 is arranged at the bottom of the transparent box body 11, the heating pipe 12 is arranged at the lower part in the transparent box body 11, the temperature and stirring speed controller 14 is arranged at one side outside the transparent box body 11, and the electromagnetic stirring table 13 and the heating pipe 12 are respectively connected with the temperature and stirring speed controller 14 through a built-in control circuit. The electromagnetic stirring table 13 is used as a lower bottom plate of the transparent box body 11. The other surfaces of the transparent box body 11 except the lower bottom plate are transparent and made of high-light-transmission high-temperature-resistant materials, such as transparent high-temperature-resistant modified polysulfone materials or other replaceable transparent high-temperature-resistant resin materials, so that the color change of the solution can be seen when the titrator is used for carrying out in-situ titration. The temperature and stirring speed controller 14 is provided with a temperature and stirring speed display screen 15, a temperature control knob 16, an electromagnetic stirring speed control knob 17 and the like. The transparent box body 11 also comprises a top plate (an upper bottom plate) and a heat preservation cover 18, wherein the top plate is provided with a plurality of working holes for fixing and supporting a titration bottle 19 (an experimental vessel such as a conical bottle, a beaker and the like); the heat preservation cover 18 is matched with the size of the working hole in the top plate, the heat preservation cover 18 is composed of a circular ring and a circular cover, the diameter of the circular cover is slightly larger than the inner diameter of the circular ring and smaller than the outer diameter of the circular ring, the circular cover is placed on the circular ring to form a complete circular cover, and the heat preservation cover 18 covers the unused working hole to play a role in heat preservation.
The experimental device for measuring the chemical oxygen demand in water by a titration method comprises a COD detection box 1, a heat preservation cover 18 of the COD detection box, a transparent box body 11, a heating pipe 12, an electromagnetic stirring table 13, a temperature and stirring speed display screen 15, a temperature and stirring speed controller 14, a temperature control knob 16, an electromagnetic stirring speed control knob 17 and the like. Wherein the transparent box body 11 is made of high-light-transmission and high-temperature-resistant material, so that the titrator can perform titration in situ. The heating pipe 12, the COD detection box heat preservation cover 18, the electromagnetic stirring speed control knob 17, the temperature and speed stirring controller 14 and the temperature and stirring speed display screen 15 can control and display the temperature in the detection box. The electromagnetic stirring table 13, the electromagnetic stirring speed control knob 17, the temperature and speed stirring controller 14 and the temperature and stirring speed display screen 15 can control and display the rotating speed of the rotor in the titration flask 19, so that the liquid rotates at a constant speed in the titration process and can be adjusted to the optimal rotating speed.
The COD in water is determined by adopting the device of the utility model: accurately transferring 100mL of water sample into a 250mL titration flask 19 (conical flask), if the water sample is turbid, passing through a 0.45 mu m filter membrane for determination, and adding 5mL of sulfuric acid with the concentration of 1+3 and 10mL of potassium permanganate solution with the concentration of 0.01mol/L into the water sample. Placing the conical flask in a COD detection box (the COD detection box is preheated to 100 ℃), carrying out water bath at 100 ℃ for 40min, adding 10mL of 0.01mol/L sodium oxalate standard solution into the conical flask, after the mauve of potassium permanganate completely disappears, placing a polytetrafluoroethylene rotor into the conical flask, adjusting the rotating speed of the rotor to be 50-100r/min by an electromagnetic stirring speed control knob, directly titrating by a titrator filled with 0.01mol/L potassium permanganate solution until the reddish color of the test solution does not fade, reading the consumption of the potassium permanganate titration solution, and calculating the COD concentration in water.
When the method is adopted to carry out a blank standard adding test, the experimental result is shown in table 1, when the COD standard adding concentration in a blank sample is 1.19mg/L, the recovery rate is 97.48-102.52%, and the relative standard deviation is 1.82%; when the COD standard concentration in the blank sample is 2.38mg/L, the recovery rate is 98.32-100.84%, and the relative standard deviation is 0.83%. The precision and accuracy of COD determination in water by using the device of the utility model are superior to those of the conventional laboratory detection method.
Table 1 precision and recovery test results (n ═ 7)
Claims (8)
1. An experimental device for measuring chemical oxygen demand in water by a titration method is characterized in that: including COD detection case and titrator, the COD detection case include box, heating pipe, electromagnetic stirring platform and temperature and stirring speed controller, electromagnetic stirring platform set up the bottom at the box, the heating pipe set up the lower part in the box, temperature and stirring speed controller set up the one side outside the box, electromagnetic stirring platform and heating pipe be connected through control scheme between temperature and the stirring speed controller separately.
2. The experimental facility for determining chemical oxygen demand in water by titration according to claim 1, wherein: the electromagnetic stirring table is used as a lower bottom plate of the box body.
3. The experimental facility for determining chemical oxygen demand in water by titration according to claim 1, wherein: the temperature and stirring speed controller is provided with a temperature and stirring speed display screen, a temperature control knob and an electromagnetic stirring speed control knob.
4. The experimental facility for determining chemical oxygen demand in water by titration according to claim 1, wherein: the box body also comprises a top plate and a heat preservation cover, wherein the top plate is provided with a plurality of working holes; the heat preservation cover is matched with the size of the working hole in the top plate.
5. The experimental facility for determining chemical oxygen demand in water by titration according to claim 4, wherein: the heat preservation cover comprises a circular ring and a circular cover, the diameter of the circular cover is larger than the inner diameter of the circular ring and smaller than the outer diameter of the circular ring, and the circular cover is placed on the circular ring to form a complete circular cover.
6. The experimental facility for determining chemical oxygen demand in water by titration according to claim 1, wherein: the box body is made of high-light-transmission and high-temperature-resistant materials except for the lower bottom plate.
7. The experimental facility for determining chemical oxygen demand in water by titration according to claim 6, wherein: the high-light-transmission high-temperature-resistant material is a transparent high-temperature-resistant resin material.
8. The experimental facility for determining chemical oxygen demand in water by titration according to claim 7, wherein: the high-light-transmission high-temperature-resistant material is a transparent high-temperature-resistant modified polysulfone material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122188716.7U CN215678255U (en) | 2021-09-10 | 2021-09-10 | Experimental device for titration method survey aquatic chemical oxygen demand |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122188716.7U CN215678255U (en) | 2021-09-10 | 2021-09-10 | Experimental device for titration method survey aquatic chemical oxygen demand |
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| CN215678255U true CN215678255U (en) | 2022-01-28 |
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| CN202122188716.7U Active CN215678255U (en) | 2021-09-10 | 2021-09-10 | Experimental device for titration method survey aquatic chemical oxygen demand |
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2021
- 2021-09-10 CN CN202122188716.7U patent/CN215678255U/en active Active
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