Chromatographic instrument classification

1) According to the principle, it can be divided into optical detectors (such as ultraviolet, fluorescence, refractive index, evaporative light scattering), thermal detectors (such as adsorption heat), electrochemical detectors (such as polarography, Coulomb, amps), electrical detectors (conductance, dielectric constant, piezoelectric quartz frequency), radioactivity detector (flicker count, electron capture, helium ionization) and hydrogen flame ionization detector.
2) According to the nature of measurement, it can be divided into general type and exclusive type (also called selective). The universal detector measures the properties of a general substance, and it reacts to both solvent and solute components, such as refractive index and evaporative light scattering detectors. The sensitivity of the general purpose type is generally lower than that of the exclusive type. A proprietary detector can only detect certain properties of certain components, such as UV and fluorescence detectors, which respond only to components that have UV or fluorescence emissions.
3) According to the detection method, it is divided into concentration type and quality type. The response of the concentration detector is related to the concentration of the components in the mobile phase, and the response of the mass detector is related to the amount of components passing through the detector per unit time.
4) The detector can also be divided into two types: destroying the sample and not destroying the sample.

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