Panel type float flowmeter | Usage of sulfur analyzer

『Panel type float flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. May I ask what is gas chromatography and liquid chromatography? The introduction of gas chromatography and liquid chromatography is as follows:

1. Separation principle

1. Gas phase: Gas chromatography is a physical separation method. By utilizing the small differences in the distribution coefficients (solubility) of the components of the tested substance between different phases, when the two phases move relative to each other, these substances undergo repeated distribution between the two phases, resulting in significant differences in properties and separation of different components. 2. Liquid phase: High performance liquid chromatography is based on classical chromatography and references the theory of gas chromatography. Technically, the mobile phase is changed to high-pressure transport (with a maximum transport pressure of 4.9107 Pa); Chromatography columns are filled with small particle size fillers using a special method, resulting in column efficiency significantly higher than classical liquid chromatography (with tens or hundreds of thousands of trays per meter); At the same time, a highly sensitive detector is connected behind the column, which can continuously detect the effluent.

2. Application Scope

1. Gas Chromatography: Gas chromatography has the advantages of good separation ability, high sensitivity, fast analysis speed, and easy operation. However, due to technical limitations, substances with high boiling points or poor thermal stability are difficult to analyze using gas chromatography.

. Generally, derivatization or pyrolysis methods can be used for substances below 500 ℃ that are not easily volatile or easily decomposed by Qingye heat. 2. Liquid phase: High performance liquid chromatography, which only requires the sample to be able to be made into a solution without gasification, is not limited by the volatility of the sample. For organic compounds with high boiling points, poor thermal stability, and high relative molecular weight (greater than 400) (some substances account for almost 75% to 80% of the total organic matter), high-performance liquid chromatography can be used for separation and analysis in principle.

III. Instrument Construction

1. Gas phase: composed of carrier gas source, injection section, chromatographic column, column temperature box, detector, and data processing system.

. The temperature of the injection section, chromatographic column, and detector are all under control. 1.1 Column Box: The chromatographic column is the heart of a gas chromatograph, and the various components in the sample are separated after repeated distribution in the chromatographic column to achieve the purpose of analysis. The function of the column box is to install the chromatographic column. Due to the connection of the two ends of the chromatographic column to the injector and detector respectively, the lower ends (joints) of the injector and detector are inserted into the column box. The column box can install various packed columns and capillary columns, and is easy to operate. The chromatographic column (sample) needs to operate under certain temperature conditions, so a microcomputer is used to control the temperature of the column box. And due to the reasonable design, the gradient inside the column box is very small. For some samples with complex composition and wide boiling range, the column box can also be subjected to third-order programmed temperature

『SILVER Official Website SERVICE』