The coal sample is burned and decomposed in the purified oxygen flow under the high temperature condition of 850 ℃, and the hydrogen is converted into water, and the carbon is converted into carbon dioxide. The reaction formula is as follows:
The water and carbon dioxide generated by the combustion pass through the platinum inner wall electrolytic cell coated with phosphorus pentoxide under the blowing of the oxygen flow. When no moisture gas passes, the internal resistance of the electrolytic cell is nearly infinite, and there is no open circuit between the positive and negative electrodes. Current passes. When the gas containing water passes through the electrolytic cell, the water is immediately absorbed by phosphorus pentoxide to generate metaphosphoric acid. The equation is as follows:
H2O ＋ P2O5─── → 2HPO3
At this time, the internal resistance of the electrolytic cell decreases, and the current flowing through the electrolytic cell gradually increases. The reaction through electrolysis is as follows:
Anode: 2PO3 ---- 2e ─ → P2O5 ＋ O2 ↑
Cathode: 2H ++ 2e ─ → H2 ↑
The maximum current flowing through the electrolytic cell shall not be less than 600mA. As electrolysis progresses, meta-phosphoric acid becomes less and less, and the electrolysis current also decreases. When it reaches the end current (70mA), it means that the electrolysis has ended. The power consumed during the electrolysis is measured. Using Faraday ’s law, it can be calculated The mass W of the substance to be measured.
W = ∫0t idt
In the formula: F: The value of Faraday's law is 96487 Coulomb;
M: the molar mass of the tested substance:
n: the number of electrons transferred to the electrode reaction substance;
i: electrolytic current
t: is the electrolysis time.
Because the instrument is based on Faraday's law as the design principle, the Coulomb integrator, quantitative technology and microcomputer microcontroller control and other advanced technologies can be used to directly display the hydrogen mass in milligrams. The printer prints three hydrogen values. If the sample weight is G (mg), the percentage content of various hydrogen values ​​can be calculated as follows:
In the formula: W: instrument hydrogen display number; (mg)
G: sample weight; (mg)
G1: blank value of measured hydrogen; (mg)
Mad: analysis of the moisture value of coal samples;%
0.1119, the coefficient of converting water into hydrogen.
The proofing basket bottom is designed to be replaceable with different patterning,everyday you can have a different nice looking of bread.
Make the bread an ART !
Featured Bread Proofing Basket
patterned bread basket,featured bread
MIANYANG BIGANT TECHNOLOGY CO LTD , https://www.bigantech.com