The principle and classification of metal element analyzer 1, chromatographic analyzer, it uses a high-performance physical separation technology for analytical chemistry and with appropriate detection methods. There are many types of chromatographs, and different classification methods can be used from different perspectives.
Classification from two phases:
In chromatography, the mobile phase can be a gas or a liquid, which can be divided into gas chromatography (gas chromatography) (GC) and liquid chromatography (liquid chromatography) (LC). The stationary phase can be either a solid or a liquid coated on a solid. Gas chromatography and liquid chromatography can be further classified into gas-liquid chromatography, gas-solid chromatography, liquid-solid chromatography, and liquid-liquid chromatography. Chromatography.
2, spectrum analyzer. The advantage is that multiple elements can be analyzed at a time with high precision. The disadvantage is that the price is too high, a set of hundreds of thousands to millions, so currently only a few large companies use.
3, spectrophotometer. The advantage is that the detection wavelength is easy to choose and the price is not high. The disadvantage is that the test result cannot be directly displayed; there is no curve establishing call function, and it is inconvenient to detect and dispense the liquid every time the different elements are detected; the basic knowledge of the chemical analysis of the operator is high, and therefore cannot be adapted. The need for on-site online inspection and analysis.
4, colorimetric element analyzer. The advantage is that it is easy to use, the price is not high, and the operator's chemical analysis basis is not very demanding. Therefore, it is widely used in the production inspection field analysis. However, because of its historical reasons, there are the following congenital defects.
Photoelectric colorimetric element analyzer was developed in China in the 1960s to meet the needs of online on-line detection and analysis of five major elements (carbon, sulfur, silicon, manganese, and phosphorus) of iron and steel metallurgy. At the time, carbon and sulfur were detected using a carbon-sulfur analyzer, and silicon, manganese, and phosphorus were measured. An elemental analyzer (three elements at the time, three channels were fixed at predetermined wavelengths to detect silicon, manganese, and phosphorus, respectively) was used. Silicon, manganese, and phosphorus were used. The wavelength required for the detection is not large, and the accuracy is not high. Therefore, the three-element analyzer satisfies the need for online on-line analysis of elemental content in the iron and steel metallurgy industry. But now, all industries need to detect materials other than steel, copper alloys, aluminum alloys, and zinc alloys. The elements examined also evolve from silicon, manganese, and phosphorus to copper, chromium, nickel, zinc, magnesium, tungsten, vanadium, and niobium. , Titanium, molybdenum, aluminum, arsenic, zirconium, boron, rare earth elements and other elements, the following defects commonly found in traditional photoelectric colorimetric elemental analyzers are increasingly manifested:
The measurement wavelength is fixed by default and cannot be continuously adjusted. Although some models can be replaced, it is still cumbersome for the user, and it is particularly inconvenient when measuring the types of elements that exceed the number of channels of the instrument or detecting different alloy materials. And not all wavelength filters and LEDs can be purchased, making it difficult to measure certain elements. For example, the measurement of magnesium requires a 576-nm light source, and filters and LEDs of this wavelength are not available. The measurement light source is mostly a DC bulb plus a filter or a cold light emitting diode, and its wavelength accuracy is poor. The wavelength accuracy of the DC bulb plus filter method depends on the filter, and most of the filter elements used in the elemental analyzer can only achieve ±15 nm.
Classification from two phases:
In chromatography, the mobile phase can be a gas or a liquid, which can be divided into gas chromatography (gas chromatography) (GC) and liquid chromatography (liquid chromatography) (LC). The stationary phase can be either a solid or a liquid coated on a solid. Gas chromatography and liquid chromatography can be further classified into gas-liquid chromatography, gas-solid chromatography, liquid-solid chromatography, and liquid-liquid chromatography. Chromatography.
2, spectrum analyzer. The advantage is that multiple elements can be analyzed at a time with high precision. The disadvantage is that the price is too high, a set of hundreds of thousands to millions, so currently only a few large companies use.
3, spectrophotometer. The advantage is that the detection wavelength is easy to choose and the price is not high. The disadvantage is that the test result cannot be directly displayed; there is no curve establishing call function, and it is inconvenient to detect and dispense the liquid every time the different elements are detected; the basic knowledge of the chemical analysis of the operator is high, and therefore cannot be adapted. The need for on-site online inspection and analysis.
4, colorimetric element analyzer. The advantage is that it is easy to use, the price is not high, and the operator's chemical analysis basis is not very demanding. Therefore, it is widely used in the production inspection field analysis. However, because of its historical reasons, there are the following congenital defects.
Photoelectric colorimetric element analyzer was developed in China in the 1960s to meet the needs of online on-line detection and analysis of five major elements (carbon, sulfur, silicon, manganese, and phosphorus) of iron and steel metallurgy. At the time, carbon and sulfur were detected using a carbon-sulfur analyzer, and silicon, manganese, and phosphorus were measured. An elemental analyzer (three elements at the time, three channels were fixed at predetermined wavelengths to detect silicon, manganese, and phosphorus, respectively) was used. Silicon, manganese, and phosphorus were used. The wavelength required for the detection is not large, and the accuracy is not high. Therefore, the three-element analyzer satisfies the need for online on-line analysis of elemental content in the iron and steel metallurgy industry. But now, all industries need to detect materials other than steel, copper alloys, aluminum alloys, and zinc alloys. The elements examined also evolve from silicon, manganese, and phosphorus to copper, chromium, nickel, zinc, magnesium, tungsten, vanadium, and niobium. , Titanium, molybdenum, aluminum, arsenic, zirconium, boron, rare earth elements and other elements, the following defects commonly found in traditional photoelectric colorimetric elemental analyzers are increasingly manifested:
The measurement wavelength is fixed by default and cannot be continuously adjusted. Although some models can be replaced, it is still cumbersome for the user, and it is particularly inconvenient when measuring the types of elements that exceed the number of channels of the instrument or detecting different alloy materials. And not all wavelength filters and LEDs can be purchased, making it difficult to measure certain elements. For example, the measurement of magnesium requires a 576-nm light source, and filters and LEDs of this wavelength are not available. The measurement light source is mostly a DC bulb plus a filter or a cold light emitting diode, and its wavelength accuracy is poor. The wavelength accuracy of the DC bulb plus filter method depends on the filter, and most of the filter elements used in the elemental analyzer can only achieve ±15 nm.
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