A set-expansion mixing module for gas transmission system of atomic fluorescence spectrometer

Abstract

The invention discloses a collection / expansion type mixing module used for a gas transmission system of an atomic fluorescence spectrometer. A mixed gas input area and a mixed gas output area are communicated through the collection / expansion type mixing module, and the collection / expansion type mixing module has multiple corners. A first radial passage and a second radial passage at two ends of the module are communicated through an axial passage and form a corner; the cross section of the axial passage takes the shape of a round table; and a contraction port and an expansion port are arranged at two ends respectively. In the mixed gas input area, uneven mixed gas of to-be-measured metal gaseous hydride, gas (hydrogen), water vapor, argon and the like advances in zigzag, and is continuously crashed and mixed fully and uniformly through compression and expansion corners and the like, so as to obtain stable laminar flow combustion flames, as a result, the stability of the testing result is improved. The mixing passage is provided with the corners, and the axial passage is provided with the contraction port and the expansion port; in coordination with bosses on the inner wall and through multiple times of experiments, the range of the optimal included angle between the contraction port and the horizontal level can be obtained, as well as the optimal specific value of the height of the radial passages to the length of the axial passage.

Description

technical field [0001] The invention relates to a set-expansion mixing module used in the gas transmission system of an atomic fluorescence spectrometer, and belongs to the technical field of atomic fluorescence analysis and measurement instruments. Background technique [0002] Atomic fluorescence spectrometer is a kind of atomic spectrum. Its principle is to use characteristic excitation light source to irradiate atomic metal atoms, so as to excite them into excited state, and the spectrum emitted when excited state atoms are de-excited is used for detection. Usually, the hydrogenation atomic fluorescence spectrometer roughly includes five parts: sample injection reaction system, gas transmission system, atomization system, light source system, and optical detection system. The advantage of this instrument design is that the gaseous metal hydride is generated by the metal element to be measured and the original hydrogen, and is separated from the liquid mixture, thereby el...

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Problems solved by technology

Due to their very different specific gravity, density and generated amount, it is difficult to fully mix evenly during the transmission process. Therefore, when the mixed gas is transmitted to the atomizer, the measured metal gas and gas are in the argon-hydrogen of the atomizer. The flame atomization process is not uniform, and the flame (hydrogen combustion) is also extremely unstable (size and up and down vibration), which causes great fluctuations in the detection signal, which is not conducive to the correct and stable detection of the emission emitted by the excited state atoms when they are de-excited. spectral energy

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