Atomic absorption spectrometer can measure a variety of elements, flame atomic absorption spectrometry can be measured on the order of 10-9g / mL, graphite furnace atomic absorption method can be measured on the order of 10-13g / mL. The hydride generator can perform micro-trace determination on eight volatile elements such as mercury, arsenic, lead, selenium, tin, antimony, bismuth and antimony.
Due to its sensitive, accurate and simple features, Atomic Absorption Spectrometer has been widely used in the analysis of constant and micro-trace elements in metallurgy, geology, mining, petroleum, light industry, agriculture, medicine, health, food and environmental monitoring.
The atomic absorption spectrometer radiates light having a characteristic line of the element to be tested from the light source, is absorbed by the ground state atom of the element to be tested in the vapor through the sample vapor, and is determined by the degree to which the radiation characteristic line light is weakened. The content of the elements.
1. Atomic Absorption Spectrometer - Method Principle Atomic absorption refers to the absorption phenomenon of a characteristic atom that is emitted by a gaseous atom to a homogeneous atom.
When the radiation is projected onto the atomic vapor, if the energy corresponding to the wavelength of the radiation is equal to the energy required for the atom to transition from the ground state to the excited state, it will cause the atom to absorb the radiation and produce an absorption spectrum. The ground state atom absorbs energy, and the outermost electrons make a transition, transitioning from a low energy state to an excited state.
2. Composition of atomic absorption spectrometer The atomic absorption spectrometer consists of a light source, an atomization system, a spectroscopic system and a detection system.
A light source The sharp line spectrum of the element to be tested required to be emitted as a light source has sufficient intensity, small background and stability. Generally used: hollow cathode lamp electrodeless discharge lamp B atomizer (atomizer)
It can be divided into a premixed flame atomizer, a graphite furnace atomizer, a quartz furnace atomizer, and a cathode sputtering atomizer.
a Flame atomizer: It consists of three parts: sprayer, premixing chamber and burner. Features: easy operation and good reproducibility. b Graphite furnace atomizer: It is a kind of specimen placed on graphite tube wall, graphite platform, carbon. A system in which a rod or a graphite crucible is electrically heated to a high temperature to achieve atomization. Among them, tubular graphite furnace is the most commonly used atomizer.
The atomization program is divided into drying, ashing, atomization, and high temperature purification. The atomization efficiency is high: the sample utilization rate reaches 100% at an adjustable high temperature.
High sensitivity: its detection limit is 10-6~10-14
Less sample: suitable for the determination of refractory elements c. Quartz furnace atomization system is a method to introduce gaseous analytes into the quartz furnace to achieve atomization at lower temperatures, also known as low temperature atomization. It is mainly used in conjunction with steam generation (hydride generation, mercury vapor generation and volatile compounds).
d. The cathode sputtering atomizer is a positive ion generated by a glow discharge to bombard the surface of the cathode, and the element to be measured is directly converted into atomic vapor from the solid surface.
C spectroscopic system (monochromator)
The performance of a dispersive element consisting of a concave mirror, slit or dispersive element as a prism or diffraction grating monochromator means the dispersion rate, resolution and concentrating power D detection system rate by detector (photomultiplier tube), amplifier, pair Number converter and computer
Due to its sensitive, accurate and simple features, Atomic Absorption Spectrometer has been widely used in the analysis of constant and micro-trace elements in metallurgy, geology, mining, petroleum, light industry, agriculture, medicine, health, food and environmental monitoring.
The atomic absorption spectrometer radiates light having a characteristic line of the element to be tested from the light source, is absorbed by the ground state atom of the element to be tested in the vapor through the sample vapor, and is determined by the degree to which the radiation characteristic line light is weakened. The content of the elements.
1. Atomic Absorption Spectrometer - Method Principle Atomic absorption refers to the absorption phenomenon of a characteristic atom that is emitted by a gaseous atom to a homogeneous atom.
When the radiation is projected onto the atomic vapor, if the energy corresponding to the wavelength of the radiation is equal to the energy required for the atom to transition from the ground state to the excited state, it will cause the atom to absorb the radiation and produce an absorption spectrum. The ground state atom absorbs energy, and the outermost electrons make a transition, transitioning from a low energy state to an excited state.
2. Composition of atomic absorption spectrometer The atomic absorption spectrometer consists of a light source, an atomization system, a spectroscopic system and a detection system.
A light source The sharp line spectrum of the element to be tested required to be emitted as a light source has sufficient intensity, small background and stability. Generally used: hollow cathode lamp electrodeless discharge lamp B atomizer (atomizer)
It can be divided into a premixed flame atomizer, a graphite furnace atomizer, a quartz furnace atomizer, and a cathode sputtering atomizer.
a Flame atomizer: It consists of three parts: sprayer, premixing chamber and burner. Features: easy operation and good reproducibility. b Graphite furnace atomizer: It is a kind of specimen placed on graphite tube wall, graphite platform, carbon. A system in which a rod or a graphite crucible is electrically heated to a high temperature to achieve atomization. Among them, tubular graphite furnace is the most commonly used atomizer.
The atomization program is divided into drying, ashing, atomization, and high temperature purification. The atomization efficiency is high: the sample utilization rate reaches 100% at an adjustable high temperature.
High sensitivity: its detection limit is 10-6~10-14
Less sample: suitable for the determination of refractory elements c. Quartz furnace atomization system is a method to introduce gaseous analytes into the quartz furnace to achieve atomization at lower temperatures, also known as low temperature atomization. It is mainly used in conjunction with steam generation (hydride generation, mercury vapor generation and volatile compounds).
d. The cathode sputtering atomizer is a positive ion generated by a glow discharge to bombard the surface of the cathode, and the element to be measured is directly converted into atomic vapor from the solid surface.
C spectroscopic system (monochromator)
The performance of a dispersive element consisting of a concave mirror, slit or dispersive element as a prism or diffraction grating monochromator means the dispersion rate, resolution and concentrating power D detection system rate by detector (photomultiplier tube), amplifier, pair Number converter and computer
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