CN106370508B - COD digestion instrument - Google Patents
COD digestion instrument Download PDFInfo
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- CN106370508B CN106370508B CN201610860669.7A CN201610860669A CN106370508B CN 106370508 B CN106370508 B CN 106370508B CN 201610860669 A CN201610860669 A CN 201610860669A CN 106370508 B CN106370508 B CN 106370508B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0247—For chemical processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
A COD digestion instrument comprises a main circuit, a heating body, a control circuit, a temperature sensor and a heat conduction platform; the positional connection relationship between them is: the heating body forms a loop with an AC220V alternating current power supply through a main circuit, one working surface of the heating body is tightly contacted with a heat conduction platform with good heat conduction coefficient through heat conduction silicone grease, and all the other surfaces except the working surface of the heat conduction platform are tightly wrapped by heat insulation paper; the gate electrode of the bidirectional thyristor in the main circuit is connected with the control circuit through a lead; the temperature sensor is contacted with the heat conduction platform and connected with the control circuit through a wire; after the structure is adopted, the COD digestion instrument adopts the main circuit formed by the bidirectional thyristor, so that the heating of a heating body of the COD digestion instrument is realized, the precise control of the heating process is realized by combining the technologies of pulse width modulation, zero crossing detection, zero voltage switching-on and the like, and the switching loss of the thyristor is reduced.
Description
Technical Field
The invention provides a COD digestion instrument, and belongs to the technical field of analysis instruments.
Background
COD (Chemical Oxygen Demand), i.e. chemical oxygen demand, refers to the amount of oxidizing agent consumed when the reducing substances in water are oxidized and decomposed under the action of an externally added strong oxidizing agent under certain severe conditions. The reducing substances in the water are oxidized and decomposed by the chemical oxidizing agent, and the consumption of oxygen is calculated according to the amount of the remaining oxidizing agent. Chemical oxygen demand, COD, reflects the degree of pollution of water by reducing substances, including organic substances, nitrite, ferrous salts, sulfide, etc., but is generally relatively small in the amount of inorganic reducing substances in water and wastewater, and pollution by organic substances is common, so COD can be an important indicator of the relative content of organic substances, and the smaller the value, the lower the water pollution degree.
At present, a COD digestion instrument is needed to heat a reaction solution containing a sample and an oxidant to cause an oxidation-reduction reaction so as to accelerate digestion of the sample, so that organic matters in the sample are completely oxidized, and further the chemical oxygen demand of the sample is measured.
The current COD digestion instrument generally adopts a main circuit structure for high-frequency conversion (such as Buck circuit) after rectification, the structure is complex, and the volume of the instrument is indirectly increased; the high-frequency signal can interfere the system, and control accuracy is affected; meanwhile, the power switch device adopted by high-frequency conversion has the problem of high power loss during the on and off periods.
Disclosure of Invention
(one) object of the invention:
the invention aims to provide a COD digestion instrument which takes a bidirectional thyristor of a power device as a main circuit and directly controls an AC220V alternating current power supply, and the COD digestion instrument has a simple structure and no high-frequency interference. Zero voltage switching is realized by combining a zero crossing detection technology, and switching power loss of the bidirectional thyristor is reduced; the heating power is precisely controlled by combining the control of the singlechip.
(II) technical scheme:
in order to achieve the aim of the invention, the invention adopts the following technical scheme:
the invention relates to a COD digestion instrument which comprises a main circuit, a heating body, a control circuit, a temperature sensor and a heat conduction platform. The positional connection relationship between them is: the heating body forms a loop with an AC220V alternating current power supply through a main circuit, one working surface of the heating body is tightly contacted with a heat conduction platform with good heat conduction coefficient through heat conduction silicone grease, and all the other surfaces except the working surface of the heat conduction platform are tightly wrapped by heat insulation paper; the gate electrode of the bidirectional thyristor in the main circuit is connected with the control circuit through a lead; the temperature sensor is contacted with the heat conduction platform and connected with the control circuit through a wire;
the main circuit is characterized in that a bidirectional thyristor is connected in series on an AC220V alternating current power supply zero line, an AC220V alternating current live wire is directly connected to one electrode of the heating body, and the AC220V alternating current power supply zero line is output to the other electrode of the heating body through the bidirectional thyristor;
the heating body is a customized resistance wire heating body;
the control circuit comprises a filtering amplifying unit, a singlechip control unit, a zero crossing detection unit, a PWM isolation driving unit, a temperature setting unit and a heat preservation time setting unit; their relationship to each other is: the temperature sensor is connected with the singlechip control unit through the filtering and amplifying unit, the singlechip control unit is connected with the PWM isolation driving unit, the temperature setting unit and the heat preservation time setting unit, the input end of the zero crossing detection unit is connected with the AC220V alternating current power supply output end and the PWM isolation driving unit, and the output end of the PWM isolation driving unit is connected with the gate electrode of the bidirectional thyristor in the main circuit;
further, the filtering amplifying unit comprises a differential amplifying circuit and a voltage filtering amplifying circuit, wherein the output end of the differential amplifying circuit is connected to the input end of the voltage filtering amplifying circuit, the differential amplifying circuit and the voltage filtering amplifying circuit are composed of an integrated operational amplifier LM258 and peripheral circuits thereof, and the reference of the differential amplifying circuit is the voltage division value of a reference resistor at 0 ℃;
further, the singlechip control unit is composed of a singlechip MC9S08DZ60MLC and a peripheral circuit thereof, and outputs a pulse width modulation signal (PWM signal);
further, the zero-crossing detection unit is composed of a photo-coupler TLP521-2, a triode 9014, a nand gate chip CD4011 and peripheral circuits thereof; the relationship of their positional connection to each other is: the live wire of the AC220V power supply is connected with the 4 pin of the photoelectric coupler TLP521-2, the cathode of the voltage stabilizing tube Z2, the anode of the voltage stabilizing tube Z2 is connected with the 1 pin of the photoelectric coupler TLP521-2, the ZERO wire of the AC220V power supply is connected with the 2 pin of the photoelectric coupler TLP521-2, the cathode of the voltage stabilizing tube Z3 is connected with the 3 pin of the photoelectric coupler TLP521-2, the 5 pin and the 7 pin of the photoelectric coupler TLP521-2 are grounded, the 6 pin and the 8 pin of the photoelectric coupler TLP521-2 are connected in parallel and then connected with the base electrode of the triode 9014, the base electrode of the triode 9014 is simultaneously supplied with power through a pull-up resistor +5V, the emitter electrode of the triode 9014 is grounded, the collector electrode of the triode 9014 is simultaneously supplied with power through the +5V through a pull-up resistor, the 1 pin and the 2 pin of the non-gate circuit chip CD4011 are connected with the 7 pin of the non-gate chip 4011, the non-gate chip CD 1 is grounded, the 6 pin of the non-gate chip is connected with the +5V supply signal 4011, and the output of the non-gate chip CD4011 is output as a non-gate output signal 4013;
further, the PWM isolation driving unit is composed of a D flip-flop chip CD4013, a triode 9014, and a photo coupler TLP 3042; their relationship to each other is: the 4 pin, the 7 pin and the 6 pin of the D trigger chip CD4013 are grounded, the 14 pin of the D trigger chip CD4013 is powered by +5V, the 5 pin of the D trigger chip CD4013 is connected with a PWM signal output by a singlechip, the 3 pin of the D trigger chip CD4013 is connected with a ZERO signal, the 1 pin of the D trigger chip CD4013 is connected with the base electrode of a triode 9014, the emitter electrode of the triode 9014 is grounded, the collector electrode of the triode 9014 is connected with the 2 pin of a photoelectric coupler TLP3042, the 1 pin of the photoelectric coupler TLP3042 is powered by +5V through a pull-up resistor, the 6 pin of the photoelectric coupler TLP3042 is used as a main circuit to be output, and the 4 pin of the photoelectric coupler TLP3042 is connected with the gate G of a bidirectional thyristor;
further, the temperature setting unit and the heat preservation time setting unit are both composed of a contact key and a peripheral circuit thereof; the contact key is a 6x6x5 micro switch;
the temperature sensor is a PT100 temperature sensor, samples a temperature signal of the working platform, and is connected with the singlechip and the peripheral circuit through the filter amplifying circuit;
the heat conduction platform is made of cast aluminum with good heat conduction coefficient, and the surface of the heat conduction platform is provided with a plurality of counter bores for placing reaction test tubes;
(III) the advantages and effects of the invention:
after the structure is adopted, the COD digestion instrument adopts the main circuit formed by the bidirectional thyristor, so that the heating of a heating body of the COD digestion instrument is realized, the precise control of the heating process is realized by combining the technologies of pulse width modulation, zero crossing detection, zero voltage switching-on and the like, and the switching loss of the thyristor is reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a schematic circuit structure of the present invention.
Fig. 2 is a schematic diagram of a filtering amplifying unit according to the present invention.
Fig. 3 is a schematic diagram of a temperature setting unit and a holding time setting unit according to the present invention.
Fig. 4 is a schematic diagram of a zero crossing detection unit according to the present invention.
Fig. 5 is a schematic diagram of a PWM isolation driving unit according to the present invention.
In the figure:
1 is a main circuit, 2 is a heating body, 3 is a temperature sensor, 4 is a control circuit, and 5 is a heat conduction platform.
401 is a singlechip control unit, 402 is a filtering amplifying unit, 403 is a temperature setting unit, 404 is a key of a heat preservation time setting unit, 405 is a zero crossing detection unit, and 406 is a PWM isolation driving unit.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings.
The invention relates to a COD digestion instrument, which is shown in figure 1 and comprises: the heating device comprises a main circuit 1, a heating body 2, a temperature sensor 3, a control circuit 4 and a heat conduction platform 5; the heating body 2 forms a loop with an AC220V alternating current power supply through the main circuit 1, one working surface of the heating body is tightly contacted with the heat conduction platform 5 with good heat conduction coefficient through heat conduction silicone grease, and all the other surfaces except the working surface of the heat conduction platform 5 are tightly wrapped by heat insulation paper; the gate G of the bidirectional thyristor in the main circuit 2 is connected with the control circuit 4 through a wire; the temperature sensor 3 is in contact with the heat conducting platform 5 and is connected with the control circuit 4 through a wire.
Referring to fig. 1, the main circuit 1 is an AC220V AC power zero line connected in series with a bidirectional thyristor T1, the AC220V AC power line is directly connected to one electrode of the heating body 2, and the AC220V AC power zero line is output to the other electrode of the heating body 2 through the bidirectional thyristor T1. The control circuit 4 controls the on and off of the bidirectional thyristor T1 in the main circuit 1, so that the output heating power is continuously adjustable by 0-100%, and the accurate control of the temperature is realized.
Referring to fig. 1, a heating body 2 is a resistive heating body, the heating body 2 is connected with an output end of a main circuit 1, one working surface of the heating body 2 is tightly contacted with a heat conduction platform 5 through heat conduction silicone grease to form a whole, and other surfaces except the working surface of the heat conduction platform 5 are tightly wrapped by heat insulation paper to realize heat preservation and prevent a circuit from being invalid due to high temperature. The heating body 2 realizes heating and heat preservation of different powers under different output powers of the main circuit.
Referring to fig. 1, the temperature sensor 3 is a PT100 temperature sensor, the temperature sensor 3 is in close contact with internal threads of the heat conduction platform 5 through heat conduction silicone grease, and an output signal thereof is output to the single-chip microcomputer control unit 401 through the filter amplification unit 402 in the control circuit 4.
Referring to fig. 1, the control circuit 4 includes a single-chip microcomputer control unit 401, a filter amplification unit 402, a temperature setting unit 403, a thermal insulation time setting unit 404, a zero crossing detection unit 405, and a PWM isolation driving unit 406. The temperature sensor 3 is connected with the singlechip control unit 401 through the filter amplification unit 402, the singlechip control unit 401 is connected with the temperature setting unit 403, the heat preservation time setting unit 404 and the PWM isolation driving unit 405, the input end of the zero crossing detection unit 405 is connected with the output end of the AC220V alternating current power supply and the PWM isolation driving unit 406, and the output end of the PWM isolation driving unit 406 is connected with the gate G of the bidirectional thyristor T1 in the main circuit 1.
The temperature signal collected by the temperature sensor 3 is filtered and amplified by the filtering and amplifying unit 402, and then is input to the single-chip microcomputer control unit 401 for collection and calculation of the temperature signal. The temperature setting unit 403 and the thermal insulation time setting unit 404 are connected with the single chip microcomputer control unit 401, and perform communication of the set temperature and the thermal insulation time. The temperature setting unit 403 and the holding time setting unit 404 are controlled to select the set temperature and the holding time by the contact keys. The singlechip in the singlechip control unit 401 adopts an MC9S08DZ60MLC singlechip, and the singlechip control unit 401 simultaneously outputs a pulse width modulation signal PWM (duty ratio is continuously adjustable between 0 and 100%) to the PWM isolation driving unit 406 except for collecting the temperature signal output by the filtering and amplifying unit 402, the set temperature signal of the temperature setting unit 403 and the set heat preservation time signal of the heat preservation time setting unit 404. The ZERO-crossing detection unit 405 detects the AC220V AC input by the main circuit 1, collects a signal ZERO at the ZERO-crossing time of the voltage, and outputs the signal ZERO to the PWM isolation driving unit 406 in cooperation with the PWM signal PWM output by the single chip microcomputer control unit 401, thereby isolating and driving the bidirectional thyristor T1 to conduct with ZERO voltage.
Referring to fig. 2, the filter amplifier circuit 402 includes a differential amplifier circuit 4021 and a voltage filter amplifier circuit 4022, and an output terminal of the differential amplifier circuit 4021 is connected to an input terminal of the voltage filter amplifier circuit 4022, and a reference of the differential amplifier circuit 4021 is a divided value of a resistance value of a PT100 temperature sensor at 0 ℃. In this embodiment, the amplifier of the differential amplifier circuit 4021 and the amplifier of the voltage filter amplifier circuit 4022 are two amplifiers of the operational amplifier U1, which is an integrated operational amplifier LM258 in this embodiment. The filtering and amplifying circuit 402 adopts a +2.5V voltage reference source stabilized by a voltage stabilizer TL431, a voltage signal fed back by a PT100 temperature sensor is differentially amplified by a voltage division value of a standard resistor (100deg.C) at 0 ℃ through an LM258, amplifiers of 5, 6 and 7 pins of the LM258 are differential amplifiers, one end of an output signal of a temperature sensor 3 is connected with the 5 pin of the LM258, and the other end is connected with the 6 pin of the LM258. After differential amplification, the voltage signals are amplified and filtered by an amplifying circuit consisting of 2, 3 and 7-pin amplifiers of the LM258 and peripheral circuits thereof, and finally the voltage signals corresponding to the measured temperature are obtained and output to the singlechip control unit 401 for operation and processing.
Referring to fig. 3, the temperature setting unit 403 and the thermal insulation time setting unit 404 are respectively composed of contact keys S1 and S2 and peripheral circuits thereof, and are connected to the single chip microcomputer control unit 401. In this embodiment, the single-chip microcomputer control unit 401 has a plurality of temperatures and heat preservation times designed therein, and is provided with corresponding indicator lamps, and only needs to select and set parameters of different temperatures and heat preservation times through the contact keys S1 and S2.
Referring to fig. 4, the zero-crossing detection unit 405 is mainly composed of a photo-coupler TLP521-2, a transistor 9014, and a nand gate chip CD4011 and peripheral circuits thereof. When the AC220V alternating current is in the phase of +5V to 0V or the phase of-5V to 0V, the photoelectric coupler TLP521-2 does not work, the base voltage of the triode 9014 is pulled up by the pull-up resistor R16, the 9014 works, the collector is grounded, the falling edge of the collector voltage of the triode in the change process of the stage occurs, and the falling edge is delayed to the AC220V alternating current zero voltage moment through the RC delay circuit, so that zero-crossing detection is realized. The falling edge is converted into a rising edge through the nand gate chip CD 4011.
Referring to fig. 5, the PWM isolation driving unit is composed of a D flip-flop chip CD4013, a triode 9014, a photo coupler TLP3042 and peripheral circuits thereof. The pulse width modulation signal PWM generated by the singlechip control unit 401 is output to the D pin of CD4013, the ZERO crossing detection signal ZERO generated by the ZERO crossing detection unit 405 is output to the CLK pin of CD4013, when the rising edge occurs in ZERO (as described above, the AC220V AC crosses ZERO), and PWM is at a high level, the Q pin of CD4013 outputs a high level to the base of the triode 9014, the collector of the triode 9014 is grounded, meanwhile, the optocoupler TLP3042 works, the gate G of the triac T1 is connected to the LOAD, and the triac is turned on. So far, the heating of the main circuit to the heating body is realized. Because the duty ratio of the PWM signal output by the singlechip control unit 401 is continuously adjustable between 0 and 100 percent, the output power can be continuously adjustable between 0 and 100 percent. And zero voltage switching of the bidirectional thyristor T1 is realized by adopting zero crossing detection, so that the switching loss of the bidirectional thyristor T1 is zero.
By adopting the embodiment, the COD digestion instrument with simple structure, accurate temperature control and low power loss is obtained.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (3)
1. COD digestion instrument, its characterized in that: the device comprises a main circuit, a heating body, a control circuit, a temperature sensor and a heat conduction platform; the positional connection relationship between them is: the heating body forms a loop with an AC220V alternating current power supply through a main circuit, one working surface of the heating body is tightly contacted with a heat conduction platform with good heat conduction coefficient through heat conduction silicone grease, and all the other surfaces except the working surface of the heat conduction platform are tightly wrapped by heat insulation paper; the gate electrode of the bidirectional thyristor in the main circuit is connected with the control circuit through a lead; the temperature sensor is contacted with the heat conduction platform and connected with the control circuit through a wire;
the main circuit is characterized in that a bidirectional thyristor is connected in series on an AC220V alternating current power supply zero line, an AC220V alternating current live wire is directly connected to one electrode of the heating body, and the AC220V alternating current power supply zero line is output to the other electrode of the heating body through the bidirectional thyristor;
the heating body is a resistance wire heating body;
the control circuit comprises a filtering amplifying unit, a singlechip control unit, a zero crossing detection unit, a PWM isolation driving unit, a temperature setting unit and a heat preservation time setting unit; their relationship to each other is: the temperature sensor is connected with the singlechip control unit through the filtering and amplifying unit, the singlechip control unit is connected with the PWM isolation driving unit, the temperature setting unit and the heat preservation time setting unit, the input end of the zero crossing detection unit is connected with the AC220V alternating current power supply output end and the PWM isolation driving unit, and the output end of the PWM isolation driving unit is connected with the gate electrode of the bidirectional thyristor in the main circuit;
further, the filtering amplifying unit comprises a differential amplifying circuit and a voltage filtering amplifying circuit, wherein the output end of the differential amplifying circuit is connected to the input end of the voltage filtering amplifying circuit, the differential amplifying circuit and the voltage filtering amplifying circuit are composed of an integrated operational amplifier LM258 and peripheral circuits thereof, and the reference of the differential amplifying circuit is the voltage division value of a reference resistor at 0 ℃;
further, the singlechip control unit consists of a singlechip MC9S08DZ60MLC and a peripheral circuit thereof, and outputs a pulse width modulation signal, namely a PWM signal;
further, the zero-crossing detection unit is composed of a photo-coupler TLP521-2, a triode 9014, a nand gate chip CD4011 and peripheral circuits thereof; the relationship of their positional connection to each other is: the live wire of the AC220V power supply is connected with the 4 pin of the photoelectric coupler TLP521-2, the cathode of the voltage stabilizing tube Z2, the anode of the voltage stabilizing tube Z2 is connected with the 1 pin of the photoelectric coupler TLP521-2, the ZERO wire of the AC220V power supply is connected with the 2 pin of the photoelectric coupler TLP521-2, the cathode of the voltage stabilizing tube Z3 is connected with the 3 pin of the photoelectric coupler TLP521-2, the 5 pin and the 7 pin of the photoelectric coupler TLP521-2 are grounded, the 6 pin and the 8 pin of the photoelectric coupler TLP521-2 are connected in parallel and then connected with the base electrode of the triode 9014, the base electrode of the triode 9014 is simultaneously supplied with power through a pull-up resistor +5V, the emitter electrode of the triode 9014 is grounded, the collector electrode of the triode 9014 is simultaneously supplied with power through the +5V through a pull-up resistor, the 1 pin and the 2 pin of the non-gate circuit chip CD4011 are connected with the 7 pin of the non-gate chip 4011, the non-gate chip CD 1 is grounded, the 6 pin of the non-gate chip is connected with the +5V supply signal 4011, and the output of the non-gate chip CD4011 is output as a non-gate output signal 4013;
further, the PWM isolation driving unit is composed of a D flip-flop chip CD4013, a triode 9014, and a photo coupler TLP 3042; their relationship to each other is: the 4 pin, the 7 pin and the 6 pin of the D trigger chip CD4013 are grounded, the 14 pin of the D trigger chip CD4013 is powered by +5V, the 5 pin of the D trigger chip CD4013 is connected with a PWM signal output by a singlechip, the 3 pin of the D trigger chip CD4013 is connected with a ZERO signal, the 1 pin of the D trigger chip CD4013 is connected with the base electrode of a triode 9014, the emitter electrode of the triode 9014 is grounded, the collector electrode of the triode 9014 is connected with the 2 pin of a photoelectric coupler TLP3042, the 1 pin of the photoelectric coupler TLP3042 is powered by +5V through a pull-up resistor, the 6 pin of the photoelectric coupler TLP3042 is used as a main circuit to be output, and the 4 pin of the photoelectric coupler TLP3042 is connected with the gate G of a bidirectional thyristor;
further, the temperature setting unit and the heat preservation time setting unit are both composed of a contact key and a peripheral circuit thereof; the contact key is a 6x6x5 micro switch;
the temperature sensor samples a temperature signal of the working platform and is connected with the singlechip and the peripheral circuit through the filter amplifying circuit;
the heat conduction platform is a working platform with a counter bore on the surface for placing a reaction test tube.
2. The COD digestion instrument of claim 1, wherein: the temperature sensor is a PT100 temperature sensor.
3. The COD digestion instrument of claim 1, wherein: the heat conduction platform is made of cast aluminum with good heat conduction coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610860669.7A CN106370508B (en) | 2016-09-28 | 2016-09-28 | COD digestion instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610860669.7A CN106370508B (en) | 2016-09-28 | 2016-09-28 | COD digestion instrument |
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| CN106370508A CN106370508A (en) | 2017-02-01 |
| CN106370508B true CN106370508B (en) | 2023-05-12 |
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| CN108956512A (en) * | 2018-07-25 | 2018-12-07 | 东南大学 | A kind of Multifunctional water Portable rapid detector and its application method and detection method |
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