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Method for measuring trace ammonium ions in high salt matrix through ion chromatography single pump column switching

A single-pump column switching and ion chromatography technology, which is applied in the field of ion chromatography to detect trace amounts of ammonium ions in complex matrix samples online, can solve the problems of ion chromatography application limitations, achieve the effect of convenient use, simple equipment, and reduced requirements

Inactive Publication Date: 2014-08-06
ZHEJIANG UNIV
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Problems solved by technology

However, when the water-soluble sample matrix is ​​complex and NH 4 + When the concentration is low, the application of ion chromatography is greatly limited

Method used

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  • Method for measuring trace ammonium ions in high salt matrix through ion chromatography single pump column switching
  • Method for measuring trace ammonium ions in high salt matrix through ion chromatography single pump column switching
  • Method for measuring trace ammonium ions in high salt matrix through ion chromatography single pump column switching

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Embodiment Construction

[0018] The technical scheme of the present invention is described in further detail below by specific embodiment:

[0019] The present invention provides a new analytical method for determining trace ammonium ions in a high-salt matrix by switching between single-pump columns in ion chromatography. A Dianne IC-90 ion chromatograph includes a six-way valve A, an infusion pump 2, The receiving tube 1, conductivity detector 8, and external six-way valve B11 can realize single-pump column switching to remove high-salt matrix in complex samples, and achieve the purpose of analyzing trace ammonium ions.

[0020] The specific steps for the detection of ammonium in seawater are as follows:

[0021] ·Standard solution configuration: weigh a certain amount of ammonium chloride analytically pure reagent, prepare a 1000mg / L standard stock solution, store it at 4°C, and dilute the standard stock solution to the required concentration when used.

[0022] Removal of complex matrix and colle...

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Abstract

The invention discloses a method for measuring trace ammonium ions in high salt matrix through ion chromatography single pump column switching. The trace ammonium ions in a complex sample can be detected. The system comprises a liquid feeding pump, a six-way valve A, an injector, a quantitative loop, a six-way valve B, a receiving pipe, a protective column, an analytical column and a suppressor, wherein the liquid feeding pump, the receiving pipe, a conductivity detector, a waste liquid bottle and the six-way valve B are connected to the six-way valve A; the six-way valve B is respectively connected with the six-way valve A, the quantitative loop, the injector, the waste liquid bottle and the protective column; the protective column is sequentially connected with the analytical column, the suppressor and the conductivity detector. The trace ions in the high salt matrix can be detected by using single pump circulating column switching ion chromatography, the problem that ions which are similar in retention effect and large in concentration difference cannot be separated by a conventional common ion chromatographic column is solved, the requirements of detection substances on the chromatographic column are lowered, a single leacheate pump is used, and the equipment is simple and convenient to use.

Description

technical field [0001] The invention relates to an ion chromatography single-pump column switching system, in particular to an ion chromatography online detection method for trace ammonium ions in complex matrix samples, which can realize the detection of trace ammonium ions in complex samples. technical background [0002] NH 4 + It is an important component of the largest cycle in nature - the nitrogen cycle, and it exists widely in various fields of nature. As a nutrient, compared to NO 3 - , NH 4 + It is easier to be absorbed and utilized by plants, however, excess NH in aqueous solution 4 + The presence of phytoplankton will promote the eutrophication process of the water body, promote the proliferation of phytoplankton, so that the dissolved oxygen in the water will be consumed in large quantities, causing a large number of deaths of fish and shrimps and other animals. Currently, NH 4 + It has been listed as the symbolic ion of water eutrophication. Therefor...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 余家胜朱岩
Owner ZHEJIANG UNIV
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