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Method and special equipment for LC-MS analyzing melamine by on-line desalinisation

A technology for melamine and special equipment, which is applied in the field of online desalination LC-MS analysis of melamine and special equipment, can solve the problems of low analysis accuracy and reliability, high cost, inconvenient promotion and use, etc., and achieve easy promotion and use, convenient operation, The effect of simple structure

Inactive Publication Date: 2009-04-29
DALIAN ELITE ANALYTICAL INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can use a mass spectrometer to obtain a large amount of data for accurate qualitative and quantitative analysis, which overcomes the problems of low analytical accuracy and reliability of the aforementioned method
However, due to the particularity of its chromatographic column, it can only be imported from abroad at present, the cost is high, and it is not easy to promote and use

Method used

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  • Method and special equipment for LC-MS analyzing melamine by on-line desalinisation
  • Method and special equipment for LC-MS analyzing melamine by on-line desalinisation
  • Method and special equipment for LC-MS analyzing melamine by on-line desalinisation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 Shown: a special equipment for on-line desalination LC-MS analysis of melamine, equipped with a two-position six-way valve V (purchased), which can be a manual or electric six-way valve V, with six valve holes 1 to 6, through Manually or electrically control the spool to realize the two positions of the valve holes 1 to 6 that are connected and not connected, namely, the I position and the II position. Short pipe connection. The valve hole 6 and the valve hole 5 are respectively the first inlet and the first outlet; the valve hole 3 and the valve hole 2 are respectively the second inlet and the second outlet, and the trap column 14 is bridged between the valve holes 1 and 4 Between them, the trapping column 14 communicates with the valve hole 6, the valve hole 5, the valve hole 3, and the valve hole 2 of the two-position six-way valve V respectively. A chromatographic column 12 is connected to the first inlet of the two-position six-way valve V, and t...

Embodiment 2

[0043] Such as figure 2 Shown: There is a two-position ten-way valve V (purchased), which can be manual or electric ten-way valve V, and has ten valve holes 0-9. The spool is controlled manually or electrically to realize the valve hole 0-9. The two positions that are connected in pairs and that are not connected in pairs are the I position and the II position. At the I position, the two-line pipeline is connected, and at the II position, the short-line pipeline is connected. Between the valve hole 4 and the valve hole 9 A normal pipeline 18 is connected across. Valve hole 1 and valve hole 6 are respectively the first inlet and the first outlet; valve hole 8 and valve hole 3 are respectively the second inlet and the second outlet, and the trap column 14A is bridged between the valve holes 0 and 7 Between them, the valve hole 1, valve hole 6, valve hole 8, and valve hole 3 of the two-position ten-way valve V are respectively connected; at the same time, the trapping column 14...

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Abstract

The invention discloses a method for an online desalination LC-MS analysis on melamine and special equipment. The method comprises the following steps: separating a sample through a reversed phase ion pair chromatography and an ion exchange chromatography and concentrating the compositions to be tested through a trapping column; washing the trapping column to remove salt or an ion pair reagent in a mobile phase; and backwashing the trapping column with a salt-free mobile phase so that the compositions to be tested enter a mass spectrum to be analyzed. The equipment is provided with a multi-port valve; a first inlet of the multi-port valve is connected with a chromatographic column and is connected with a mobile phase input pump through a sampling valve; the first inlet is also connected with a desalting cleaning liquid input pump; a first outlet of the multi-port valve is connected with a waste liquid pool; a second inlet of the multi-port valve is connected with a salt-free mobile phase input pump; the second outlet of the multi-port valve is connected with a mass spectrum detector; and the trapping column is bridged between two valve holes of the multi-port valve. The equipment has the advantages of simple structure, convenient operation and low cost, thus the reversed phase ion pair chromatography and the ion exchange chromatography can be used together with a mass spectrometric analysis.

Description

Technical field: [0001] The invention relates to an LC-MS analysis method and device for melamine, in particular to an on-line desalination LC with simple structure, convenient operation and low cost, which can realize reversed-phase ion-pair chromatography and ion-exchange chromatography combined with mass spectrometry -MS analysis method and special equipment for melamine. Background technique: [0002] Melamine is an important nitrogen heterocyclic organic chemical raw material, which can be widely used in the production of plastics, floor tiles, kitchen utensils, fireproof fibers, commercial filter membranes, glues and flame retardants. However, the U.S. Food and Drug Administration (FDA) found melamine for the first time in its test report on pet food on March 30, 2007, and later found that 22 kinds of infant milk powder such as Sanlu contained melamine. It was also found that various brands of liquid milk and milk powder, such as Yili and Mengniu, contained varying de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/20G01N30/96C07D251/54
Inventor 唐涛张维冰李彤
Owner DALIAN ELITE ANALYTICAL INSTR
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