Method for determining silicate and phosphate ions with ion chromatography post-column derivatization method

An ion chromatography column and silicate technology, applied in the field of ion chromatography post-column derivatization system, to achieve the effect of high separation ability, high detection limit and sensitivity, high application prospect and value

Inactive Publication Date: 2014-08-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the properties of the two ions are relatively similar when forming heteropolyacids, it is very challenging to develop simultaneous determination of two ions

Method used

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  • Method for determining silicate and phosphate ions with ion chromatography post-column derivatization method
  • Method for determining silicate and phosphate ions with ion chromatography post-column derivatization method

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Embodiment Construction

[0028] The invention provides a method for determining silicate and phosphate ions by an ion chromatography post-column derivatization method. The system includes a sample injector 1, a six-way valve 2, an anion separation column 3, an infusion pump A4, an infusion pump B5, an infusion solution Pump C5, tee, derivation reaction tube 7, UV-Vis spectrophotometer 8, waste liquid bottle 9, sampler 1 is connected to six-way valve 2, and six-way valve 2 is connected to infusion pump A4 and anion separation column 3 respectively, The anion separation column 3 is connected with the three-way connection with the liquid pump B5 and the infusion pump C5 in turn, and the three-way connection is connected with the derivation reaction tube 7, the ultraviolet-visible spectrophotometer 8 and the waste liquid bottle 9 in turn.

[0029] The ion chromatographic post-column derivatization method is used to determine silicate and phosphate ions. After diluting the aqueous solution of the sample to ...

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Abstract

The invention discloses a method for determining silicate and phosphate ions with an ion chromatography post-column derivatization method. The method comprises the steps that a water solution of a sample to be determined is diluted to a certain multiple times firstly and then the solution is sampled; after the solution is separated and eluted by an anion exchange chromatography column, the separated and diluted solution is derived by an acidified sodium molybdate solution and reduced by ascorbic acid, a product is strongly absorbed in a near infrared region, so that the silicate and phosphate ions are subjected to separated detection; the concentration and the acidity of a post-column derivatization reagent and a reductant are adjusted before determination, so that a derivative compound has the concentration with maximum absorption value, and further high limit of detection and accuracy can be obtained. According to the method, a conventional anion exchange analytical column is used for separating two ions; compared with other reported separation methods, an ion exchange chromatography has higher separation capability and is usually applied to separating ions with similar properties, and therefore, the ion exchange chromatography can be applied to separating the silicate and phosphate ions in complex matrix systems; the method has high application prospects and values.

Description

technical field [0001] The invention relates to an ion chromatographic post-column derivatization system, in particular to a new method for determining silicate and phosphate by using the post-column derivatization method of ion chromatogram. Background technique [0002] As we all know, silicon and phosphorus play an irreplaceable role in organisms. Silicon is the second most abundant element on earth after oxygen, while phosphorus is the basic element of genetic material nucleic acid. The content of the two elements in the water body has a great influence on the growth of algae plants. Monitoring the content of silicon and phosphorus in the water body has a great role and effect in controlling the eutrophication pollution of the water body [1-2]. [0003] At present, for the two elements, the two elements are mostly used to react with molybdate to form silicon molybdenum yellow and phosphomolybdenum yellow heteropolyacid [3], or further use a reducing agent to reduce to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 贺婕朱岩
Owner ZHEJIANG UNIV
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