Method for detecting melamine by ion chromatography

A melamine and ion chromatography technology, applied in the detection field of melamine, can solve the problems of large quantity, insufficient sensitivity, time-consuming and labor-intensive process, etc., and achieve the effect of simple operation, improved sensitivity, and accurate melamine content

Inactive Publication Date: 2012-06-20
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

These methods require complex and cumbersome sample pretreatment procedures, and the experimental process requires a large amount of organic solvents and chemicals, which is time-consuming and labor-intensive.
The detection sensitivity is not high enough

Method used

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  • Method for detecting melamine by ion chromatography
  • Method for detecting melamine by ion chromatography
  • Method for detecting melamine by ion chromatography

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Embodiment Construction

[0017] The following examples are provided to further illustrate the present invention, but not to limit the scope of the present invention.

[0018] The required instruments are MIC ion chromatograph, separation column METROSEP C2 150, protection column Metrosep C2 Guard, and ultraviolet detector.

[0019] Reagents required: standard melamine (provided by Anpu Company), electronic grade concentrated sulfuric acid (provided by Anpu Company), electronic grade concentrated nitric acid (provided by Anpu Company), acetic acid (provided by China National Pharmaceutical Group), and the resistivity of ultrapure water 18.2MΩ.cm (25°C), the reagents used are all filtered through a 0.45μm filter membrane before use.

[0020] 1) Determination of the best detection conditions

[0021] (1) Preparation of eluent: use ultrapure water and electronic grade concentrated sulfuric acid to prepare 1.0mmol / L, 1.5mmol / L, 2.0mmol / L and 3.0mmol / L sulfuric acid aqueous solutions as eluent. Use ultrap...

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Abstract

The invention relates to a method for detecting melamine by ion chromatography. The method comprises the following steps of: pretreating a sample to be detected by using an on-line osmotic membrane method to obtain an extracting solution of the sample; analyzing a peak area of the extracting solution of the sample by using an ion chromatograph, and comparing with a marked calibration curve to obtain the concentration of melamine in the extracting solution, thus obtaining the concentration of the melamine in the sample to be detected, wherein detection conditions of the ion chromatograph are that the sample size is 20 mu L, leacheate is an aqueous solution of sulfuric acid at the concentration of 1.5mmol/L, the flow rate is 0.9mL/min and the detection wavelength of an ultraviolet detector is 240nm. Compared with the prior art, the method has the advantages that: the melamine content in multiple samples can be effectively detected, the whole operation is simple and quick, the detected melamine content is accurate, and a blank of detecting the melamine content in multiple samples by the ion chromatography is filled up.

Description

technical field [0001] The invention relates to the detection of melamine, in particular to a method for sensitively detecting the content of melamine in multiple samples based on ion chromatography technology. Background technique [0002] Melamine (English name Melamine) is an organic chemical intermediate product, mainly used as a raw material for the production of melamine-formaldehyde resin, and can also be used as a flame retardant, water reducer and formaldehyde deodorant. Its molecular formula is C 3 N 6 h 6 、C 3 N 3 (NH 2 ) 3 , molecular weight 126.12, white monoclinic prism crystal, odorless, density 1.573g / cm 3 (16°C). Soluble in hot water, slightly soluble in cold water, soluble in methanol, formaldehyde, acetic acid, insoluble in ether benzene and carbon tetrachloride, etc. It is relatively stable at room temperature, but it will decompose into cyanide at high temperature. Melamine is a weak base (pKb=8), and can form melamine salt with hydrochloric ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 王渊龙赖奕坚喻文娟邹亚娟许实朱邦尚
Owner SHANGHAI JIAO TONG UNIV
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