Trace element analysis factory furniture has the advantages of high sensitivity and selectivity.

Principle of fast detection instrument for food safety

The relative index components in food samples can react with the chromogenic reagents under certain conditions to produce products with different color depths. These products can selectively absorb visible light at different wavelengths. The color depth, i.e. the absorbance, is related to the concentration of the index components in the samples. The Lambert Bill law is adopted within the appropriate concentration range. Therefore, the absorbance value can be calculated automatically by the standard curve software built in the instrument to get the accurate concentration of the index component in the sample and whether it exceeds the standard.

An atomic absorption spectrophotometer is used to measure the absorbance of an element by its atomic vapor through the resonance radiation of the element to be measured. It has single beam, double beam, double channel, and multi wave structure. Its basic structure includes light source, atomizer, optical system and detection system. It is mainly used for the analysis of trace elements impurities. It has two main advantages: high sensitivity and good selectivity. It is widely used in the analysis of trace elements in various gases, organometallic compounds and metal alkoxides. However, the measurement of each element requires a corresponding hollow cathode lamp, which is inconvenient for testing.

Elements are heated and atomized in a pyrolytic graphite furnace to form ground-state atomic vapor, which selectively absorbs the characteristic radiation emitted by a hollow cathode lamp. In a certain concentration range, the absorption intensity is directly proportional to the content of the tested elements in the test solution. Its quantitative relationship can be used Lambert-Beer law, A = LG I / O = lgT = KCL, formula I is the intensity of transmission light; I0 is the intensity of emission light; T is the transmission; L is the light path through the atomizer (length), the L value of each instrument is fixed; C is the concentration of the sample measured; therefore A = KC.

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