CSY-K2 automatic trace moisture analyzer works:
The reaction of Karl-Fischer reagent with water is
I2+SO2+3C5H5N+H2O—2C5H5N·HI+ C5H5N·SO3..............................1
C5H5N·SO3+CH3OH—C5H5N·HSO4CH3..........................................2
The reagent solution used is a mixture of predominant iodine and sulphur dioxide-filled acridine, methanol, etc., and the sample is added to the reagent, and the iodine generated by the electrolysis on the anode reacts with the water in the sample according to Faraday's law. Iodine is produced in proportion to the amount of electricity. During the electrolysis process, the electrode reaction is as follows:
Anode: 2I--2e I2
Cathode: I2+ 2e 2I-; 2H++ 2e H2
1 mole of iodine reacts with 1 mole of water mass, so 1 mg of water is equivalent to 10.71 coulomb of electricity. According to this principle, the water content can be directly determined from the amount of electricity required for electrolysis, and the content of the measurement sample is directly displayed on the display by the calculation of the instrument. The amount of water.
Show.
How to use the automatic trace moisture analyzer:
(1) Installation of the instrument
1. The deep micro-moisture analyzer of Shenfen Instrument should be placed on a flat workbench when working. The convection of air should be minimized in the environment.
2. There are no mechanical vibrations, corrosive gases, pollution, electromagnetic interference, etc. that affect the normal operation of the instrument.
3, power supply: single-phase three-wire system, AC220V ± 10%, 50Hz, must have a good ground.
4, the ambient temperature: 5 ~ 35 ° C.
5. Relative humidity: ≤ 85%.
(B) CSY-K2 trace moisture analyzer self-test function
Connect the 220V AC power supply to the power socket and turn on the power switch. When the titration socket and the measurement socket are open in Figure 3, when the measurement socket is shorted, the measurement shows that the iodine is not counted. When the titration socket is shorted, the measurement shows the water. And press the start button, alarm after one minute, the end indicator light is on, in line with the above process, indicating that the instrument host is working properly.
(3) Titration tank cleaning, drying and assembly
1. Open all the glass ports of the titration cell before loading the reagents, and clean the titration tank, drying tube, sealing plug, etc. according to the requirements of the glass products. After washing, it was dried in an oven at about 105 ° C for about 3-4 hours, then taken out and placed in a desiccator for cooling. The cathode chamber and the measuring electrode can not be washed with water. It can be washed with acetone and methanol. After cleaning, it should be dried by a hair dryer. When cleaning, it should be noted that it should not be cleaned to the electrode lead. Otherwise, measurement errors will occur during the measurement of the sample.
2. Put the silica gel into the drying tube, be careful not to load the silica gel powder, and then install the plug of the sample injection port. After completing the above process, carefully insert the stirrer through the sample injection port, and then measure the electric level separately. , the cathode chamber, the drying tube, the injection cock, the sealing plug's grinding mouth, evenly coated with a layer of vacuum grease, except the drying tube and sealing plug of the cathode chamber are not installed, the other parts are attached to the corresponding parts, light Turn it lightly to make it a better seal.
3. Inject about 100-200 ml of reagent into the anode chamber through the sealing port with a funnel, and then use the funnel to inject the reagent into the cathode chamber through the cathode chamber drying tube socket. The liquid level of the cathode and anode chambers should be basically the same, and then dry after completion. Install the tube and sealing plug, gently rotate it to make it better sealed, put the titration cell on the magnetic stirrer, clamp it with the clamper, insert the measuring electrode and the titration electrode plug into the measuring and titration socket respectively. .
(4) Establishment of measuring conditions and operation steps
1. Parameter setting First adjust the menu to the parameter setting position and press the OK button to set the volume and density.
2, the print status in the parameter settings, there are two states of printing and not printing.
3. Date and time setting Turn the menu to the time setting and press the OK key. Number (××××年××月××日××××分××秒) Input Press the Select/Enter key. After each digit is set, press the function/determine key. The settings have been completed.
4. Average value: When the same sample or different samples need to calculate the water-containing average value, press the Select/Enter key in the recall menu to adjust to the print average position, and then press the function/OK button. The printer can be 1-N. The average number of injections is printed.
5, Shenfen instrument trace moisture analyzer operating steps (1) start to display a trace moisture analyzer, according to the stirring button in the electrolytic cell magnetic stirrer rotation, stirring speed for the stirred electrolyte is not suitable.
(2) Press the function/determine button, the screen displays the relevant parameters, and the electrolysis switch is turned on (the new electrolyte shows iodine). The 50μl sampler can be adjusted to the balance with the appropriate amount of water. The used electrolyte has always been displayed when it is turned on. , through the electrolytic titration to reach the balance, the alarm, the end indicator light.
(3) When the instrument reaches the initial equilibrium point and is relatively stable, it can be calibrated with pure water.
A. 0.1 μl of pure water was withdrawn using a 0.5 μl injector.
Special Note: Slowly rotate the injector core while pumping up.
B. Press the start button.
C. Inject pure water into the anode chamber reagent through the injection cock. Note that the needle tip should be inserted into the reagent and avoid contact with the inner wall or electrode of the titration cell. The titration will start automatically after the injection.
D. After one minute, the buzzer sounds and the end point END indicator light is on. The display result should be 100±10μgH20, which is generally calibrated 3 times. If the three results are within the error range, the sample can be measured.
Special attention: the operation quality of the titration pool cleaning, drying and assembly, calibration of the instrument, etc. is the prerequisite for the success of the test. The Shenfen instrument prompts must be carefully operated according to the prescribed procedures and requirements!
(4) Sample test, a certain number of samples (usually in units of 1 ml) are injected into the titration bottle. After electrolysis reaches the end point, the end point indicator lights up and alarms, and the printer prints out the moisture content of the sample. When using the instrument for the first time or when the sample is different, it is necessary to pay attention to the volume and density of the sample to match the volume and density set in the machine.
(5) The measurement results are expressed in μgH2O units, and the moisture content in the sample is calculated by the following relationship:
Test result (μgH2O) measured result (μgH2O)
Water content PPM= =
Sample quality (g) Sample density × sample volume The machine is equipped with automatic calculation function of mass (μg) and volume (ml) without manual calculation.
It takes at least 2 months for Pacific saury to be directly sold or processed.How to effectively maintain the nutritional value and flavor of saury has also become a research hotspot. At present, the easiest and most effective way to store saury is freezing. The lower the freezing temperature is, the more beneficial it is to maintain the quality of saury. It can only be stored for 180 days at -20°C, and -30°C is the suitable temperature for freezing saury.
Saury,Saury Fish,Pacific Saury,Japanese Saury
Zhejiang Industrial Group Co., Ltd. , https://www.xingyeseafood.com