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Ion chromatography circulating column switching analysis system and detection method thereof

An analysis system and ion chromatography technology, applied in the direction of analysis materials, measurement devices, material separation, etc., can solve the problems of increased analysis cost, complex flow path of the system, and limitation of analysis objects, so as to save analysis cost, simplify switching system, eliminate interference effect

Inactive Publication Date: 2011-11-23
ZHEJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For the above-mentioned column switching system, the former requires more chromatographic accessories, while the latter system has a more complicated flow path and has specific restrictions on the analysis objects. These situations will also lead to increased analysis costs or cumbersome operations.
[0003] So far, there have been no reports at home and abroad on the separation and analysis of high-concentration matrix and trace ions with similar chromatographic retention properties using a circulating column switching system.

Method used

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  • Ion chromatography circulating column switching analysis system and detection method thereof
  • Ion chromatography circulating column switching analysis system and detection method thereof
  • Ion chromatography circulating column switching analysis system and detection method thereof

Examples

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Embodiment 1

[0033] This embodiment is the circulation analysis of trace amount of chlorate in sodium chloride electrolyte

[0034] Instruments used: Dionex ICS2100 ion chromatograph (Dionex, USA), equipped with a six-way valve and a ten-way valve, EG50 eluent generator and DS6 conductivity detector, Chromeleon 6.8 chromatographic workstation, SHY-2 self-regeneration Suppressor (Qingdao Shenghan), IonPac AG19 guard column (50mm×4mm), AS19 analytical column (250mm×4mm), AG16 guard column (50mm×4mm), 25μL quantitative loop.

[0035] Chromatographic conditions: the mobile phase is 10 mmol / L KOH online eluent, isocratic elution, the flow rate is 1.0 mL / min, and the injection volume is 25 μL.

[0036] The circulating column switching system of the present invention is according to the attached figure 1 Connection: components consist of pump 1, six-way valve 2, ten-way valve 3, guard column 4, analysis column 5, enrichment column 6, suppressor 7, conductivity detector 8, quantitative loop 9, s...

Embodiment 2

[0051] This embodiment is a trace nitrite cycle analysis in a high chlorine matrix

[0052] The instrument used, chromatographic conditions, cycle column switching system, and analysis steps are the same as in Example 1.

[0053] After 3 cyclic switchings of the analysis steps described in Example 1, the spectrograms surveyed and drawn are shown in Image 6 , 14 is the chloride ion peak among the figure, and 15 is the nitrite radical peak.

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Abstract

The invention relates to an ion chromatography circulating column switching system, especially relates to an ion chromatography analysis system for on-line cycling separation and detection of high-concentration base ions having near chromatographic retention characters and trace irons requiring detection. The invention discloses an ion chromatography circulating column switching analysis system. The system is characterized by: converting an elutriant into water and removing eluting power of the elutriant after flowing through a suppressor; carrying out on-line cycling elimination for the high-concentration base ions and carrying out cycling analysis for the irons requiring detection through switching valves. The switching analysis system provided by the present invention comprises: a pump, a six-way valve, a ten-way valve, a protection column, a analysis column, a enrichment column, the suppressor, a conductivity detector, a sample loop, a sample injector and a waste liquid bottle. The switching analysis system provided by the present invention can be applicable for elimination of the high-concentration base ions during the ion chromatography separation and detection process for a series of irons having the near chromatographic retention characters, and has very high practical value.

Description

technical field [0001] The invention relates to an ion chromatographic circulation column switching system, in particular to an ion chromatographic analysis system for on-line circulation separation and detection of high-concentration matrix ions and trace ions to be measured with similar chromatographic retention properties. Background technique [0002] Ion chromatography column switching technology is more and more widely used in the elimination of complex matrices due to its advantages of high flexibility and easy operation. There are two main types of existing on-line matrix elimination column switching technologies: 1. Use a double-pump system for matrix elimination; 2. Use a single-pump system and use the different retention properties of the matrix and the analyte on a specific enrichment column to perform Separation and enrichment, and then the enriched analytes are injected and analyzed by switching the valve. For the above-mentioned column switching system, the f...

Claims

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Application Information

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IPC IPC(8): G01N30/88G01N30/44
Inventor 王瑞琪王娜妮朱岩
Owner ZHEJIANG UNIV
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