China Education Equipment Purchasing Network News: Trace Moisture Analyzer is also called Karl Fischer Moisture Analyzer, similar to Moisture Analyzer, Moisture Analyzer, Moisture Meter, Moisture Analyzer, Moisture Analyzer, Moisture Analyzer It is mainly used for the detection of samples with low moisture content. After improvements in recent years, it has greatly improved the accuracy and expanded the measurement range.
working principle
(1) Analysis principle
In the classic Karl Fischer volumetric titration process, in the presence of water, iodine reacts with sulfur dioxide as follows:
H2O I2 SO2 CH3OH 3RN → 2RN · HI RN · HS04CH3 …………………… (1)
The iodine required for the reaction is supplemented by the addition of a standard solution containing iodine.
This instrument belongs to the electric quantity method, which is based on dissolving the sample in an electrolyte containing a special solvent containing iodine, water consumes iodine, and the required iodine is no longer titrated with a standard iodine-containing reagent, but through the electrolytic process , So that the iodine ion in the solution is anodized to iodine:
2I ———— 2e—— → I2 ……………………………………………………………… (2)
The generated iodine reacts with the water in the sample again, and the end point is indicated by a double platinum electrode. When the concentration of iodine in the electrolyte returns to the original concentration, the electrolysis is stopped. Then according to Faraday's law of electrolysis:
m = × =
Where: m-weight of water in the sample, mg;
C-electricity consumed by electrolysis, mc;
M-molecular weight of water;
n——the number of electron transfer;
i——electrolysis current, mA;
t——electrolysis time, s;
96500-Faraday constant;
10722——Electricity consumed by electrolysis of 1mg water, mc.
As long as the required parameters are input into the instrument microcomputer, the water content in the analysis sample can be expressed in ppm or%, μg.
The micro moisture analyzer is the latest generation of intelligent moisture analyzer that combines the micro-coulomb principle and single-chip microcomputer technology. It has the characteristics of high sensitivity, fast analysis speed, accurate results, and easy operation. It is widely used in petroleum and chemical fertilizers. , Chemical industry, electric power, metallurgy, medicine, geology, university teaching and other fields. Executive standard: SH / T0246.
2. Performance characteristics:
It has high sensitivity, fast analysis speed, accurate results and easy operation.
Both high and low water content can be accurately measured
The micro moisture analyzer is a new generation of intelligent moisture analyzer based on the principle of microcoulometric titration, using double platinum electrodes to detect the titration process, and using a microcomputer to control electrolysis and data processing systems.
The instrument can automatically perform baseline correction. In addition to the LCD module display, the operating parameters and analysis results can be printed and archived by the printer as required. The instrument has the advantages of high sensitivity, good stability, accurate results, simple operation and fast analysis. The instrument can be used to analyze the water content in petroleum and petrochemical products, and can also be used to monitor the water content of substances in the production and scientific research of chemical, food, power, metallurgy, medicine, health and environmental protection systems.
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