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A gas-liquid separation method and device for gaseous sampling of atomic spectrometer

A gas-liquid separation device and atomic spectroscopy technology, which is applied in the field of gas-liquid separation of gaseous sampling of atomic spectrometers, can solve the problem of low separation efficiency, limiting the optimization of gas-liquid separators, affecting the sensitivity and detection limit of gaseous sampling and other problems, to achieve the effect of high separation efficiency and high efficiency

Inactive Publication Date: 2019-07-09
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (3) Separate the solution bubbling through the sintered glass core filter plate. This technology is to separate the carrier gas from the bottom of a sintered glass core filter plate to the solution on the sintered glass core filter plate. This method has good The gas-liquid separation efficiency, but so far, no literature or patent has revealed the effect of the pore size on the sintered glass on the separation efficiency
This limits the optimization of the gas-liquid separator
[0008] As mentioned above, the above-mentioned several gas-liquid separation methods and devices have the disadvantages that the separation efficiency is not high, except for sodium borohydride and arsenic, mercury, lead, selenium, germanium, tellurium, bismuth, antimony, tin and The volatiles generated by the cadmium reaction are easy to be separated, and the other on-line reactions—gas separation effects are not very ideal
Therefore, the sensitivity and detection limit of gaseous injection are affected

Method used

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  • A gas-liquid separation method and device for gaseous sampling of atomic spectrometer
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  • A gas-liquid separation method and device for gaseous sampling of atomic spectrometer

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Embodiment 1

[0032] See attached figure 1 . A gas-liquid separation method for gaseous sampling of atomic spectrometers: After using a peristaltic pump to mix the sample solution and the reaction reagent solution online, the mixed solution enters the porous polymer membrane filter plate from the mixed solution inlet tube, and the filter plate The diameter of the pores on the filter plate is 5-10 microns, and the height of the upper space of the filter plate is 1.5 cm. The volatile substances in the solution are separated by the argon gas bubbling from below, and the separated volatile substances and solution are separated by the side of the porous filter plate. The carrier gas flow is purged into the second gas-liquid separator, where the solution settles to the bottom and is discharged, while the carrier gas and volatile substances enter the atomic spectrometer for determination.

Embodiment 2

[0034] See attached figure 2. A gas-liquid separation device for gaseous sampling of atomic spectrometers, characterized in that the device is composed of two gas-liquid separators (A) and (B) connected left and right, mainly including mixed solution inlet tube 1, micropore bubbling Filter plate 2, carrier gas inlet pipe 3, carrier gas outlet 5, separated waste liquid discharge pipe 6, wherein the mixed solution enters the microporous bubbling filter plate from the mixed solution inlet pipe, and the volatile substances in the solution are The argon gas fed into the first gas-liquid separator (A) is bubbled and separated, and the separated volatiles and solutions are purged by the carrier gas purge inlet pipe flow into the second gas-liquid separator (B), Here the solution settles to the bottom and is discharged from the waste liquid discharge pipe 6, while the carrier gas and element volatiles enter the atomic spectrometer through the carrier gas outlet at the upper end of th...

Embodiment 3

[0036] See attached figure 2 . Use a peristaltic pump to mix 0.4% sodium ethylenediamine dithiocarbamate (Na-DDTC) and a sample solution containing 2ppb zinc at an equal flow rate online (the acidity of the sample for zinc is 0.075M), and the mixed solution enters from tube 1 On a porous sintered glass filter plate with a pore size of 5-15 microns (30 mm in diameter, 2 cm in height above the filter plate), the volatile zinc-DDTC in the solution is immediately absorbed by the carrier gas (argon) Bubble separation, while the separated volatiles and solution are swept by the carrier gas flow into the second gas-liquid separator, where the solution settles to the bottom and is discharged, while the carrier gas and zinc volatiles are entered into the atom spectrometer to measure. Using this device, the volatilization efficiency of zinc can reach 95%, and the detection limit of non-dispersive atomic fluorescence is 0.2ppb. Compared with a single bubbling separator with a pore siz...

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Abstract

The invention discloses a gas-liquid separation method and device for gas-state sample introduction of an atomic spectrograph. The method comprises the steps of mixing a sample solution and a reaction agent solution online, dropwise adding the mixed solution into a filter plate with micropores from a mixed solution entering pipe, bubble separating volatile matters in the solution by virtue of argon introduced from the lower part of the filter plate, and simultaneously and immediately blowing the separated volatile matters and the solution by carried air flow into a second gas-liquid separator in which the solution is settled to the bottom and discharged, but carrier gas and the volatile matters are introduced into the atomic spectrograph for determination. Compared with existing gas-liquid separation techniques, the device can be used for efficiently separating dissolved gas in the solution and is particularly applicable to gas-state sample introduction techniques in atomic spectrums.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a gas-liquid separation method and device for gas-state sampling of an atomic spectrometer. Background technique [0002] Gas-liquid separation is widely used in the fields of chemistry, biology and water treatment. Small gas-liquid separators are also widely used in analytical chemistry, especially in the gaseous sampling of atomic spectroscopy (ICP-AES, ICP-MS, AA, AFS). By reacting the elements in the sample to be tested with some reagents online, the volatiles of the tested elements are generated. The volatiles have a certain solubility in the solution, so the volatiles must be separated from the solution by means of a gas-liquid separation device. Come out to measure. Through such on-line separation, not only the sensitivity of atomic spectroscopic analysis is improved and the detection limit is reduced, but also the element to be measured is well ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/01G01N21/3103
Inventor 段旭川
Owner TIANJIN NORMAL UNIVERSITY