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Novel testing method of carbon-containing organic substance

A method of determination, a technology of organic matter, applied in the direction of chemical analysis using catalysis, etc., which can solve problems such as difficult real-time online monitoring methods, long time consumption, analysis column or instrument damage, etc.

Inactive Publication Date: 2013-10-30
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] At present, the quantitative determination of most organic compounds is carried out by chromatography (such as gas chromatography, liquid chromatography), chromatography-mass spectrometry (such as gas chromatography-mass spectrometry, liquid chromatography-mass spectrometry), spectrometry (such as ultraviolet-visible spectrophotometry), these methods not only have low sensitivity (the detection limit is generally above the mg / L level), but also take a long time to measure a single sample (more than 30 minutes for some samples), and even some Some samples need to undergo various pretreatments (such as filtration, concentration, pre-column derivatization, etc.) before they can be determined, which brings inevitable errors to the determination.
These methods are difficult to become real-time online monitoring methods due to factors such as low sensitivity, cumbersome operation, time-consuming measurement, and the possibility of introducing errors.
In the above determination method, the solvent must be an organic solvent (such as methanol, ethanol, n-hexane, etc.), which is not suitable for the concentration determination of the aqueous solution of organic matter. Even if it is done reluctantly, it will cause irreversible damage to the analytical column or instrument.

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Examples

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Effect test

Embodiment 1

[0020] Example 1: On-line detection of new alkalizing agent ethanolamine in the secondary circuit of nuclear power plant

[0021] Ethanolamine is an organic amine, which is increasingly used in the secondary circuit of nuclear power plants because of its strong alkalinity, low vapor-liquid distribution and good thermal stability. Under the circumstances that my country is vigorously developing the third-generation nuclear power technology, and the ethanolamine water working condition is determined as the nuclear power secondary circuit water treatment technology, the accurate determination of the concentration of ethanolamine in the feed water has attracted great attention from experts in the industry. So far, there are few domestic reports on the determination of ethanolamine in the secondary loop of nuclear power plants. There are also certain disadvantages in the determination of ethanolamine concentration in feed water by ion chromatography in foreign countries: for exampl...

Embodiment 2

[0034] Example 2: Detection of the concentration of ethanolamine in the regeneration waste liquid of the nuclear power plant fine treatment system

[0035] As described in Example 1, when ethanolamine water is used as the water supply for the secondary circuit of the nuclear power plant, the resin in the condensate polishing system will be saturated due to the continuous exchange of ethanolamine. Among the saturated resins, the anion and cation resins are mainly composed of ethanolamine and ethanolamine respectively. in the form of chloride. In order to ensure the treatment efficiency of the condensate polishing system, the condensate polishing system must be regenerated with acid and alkali after running for a period of time, so the regeneration waste liquid will contain a relatively high content of ethanolamine.

[0036] The requirements for COD and N in the wastewater discharge standards of foreign nuclear power plants are particularly strict: in 2007, they were 30 and 60 m...

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Abstract

The invention discloses a novel testing method of carbon-containing organic substance. The method is based on the TOC (Total Organic Carbon) testing technology, a TOC tester is used as an analysis tool, and test on mass concentration of the organic substance is realized according to the TOC content in water solution and the fixed carbon percentage in the organic substance. The novel testing method is free from any sample pretreatment, is quick in test, high in sensitivity, wide in application range and high in testing accuracy, thereby being very suitable for on-site online monitoring.

Description

technical field [0001] The invention relates to a new method for measuring carbon-containing organic matter. Specifically, it relates to a method for determining easily water-soluble carbon-containing organic matter. The new measurement method is based on the total organic carbon (TOC) measurement technology, uses the TOC analyzer as an analysis method, and realizes the concentration of the organic substance according to the total organic carbon (TOC) content in the aqueous solution and the fixed carbon content in the organic substance. Determination. The new assay method not only does not require sample pretreatment, but also has high assay speed and high sensitivity, has a wide application range and high assay accuracy, and is very suitable for on-site on-line monitoring. Background technique [0002] At present, the quantitative determination of most organic compounds is carried out by chromatography (such as gas chromatography, liquid chromatography), chromatography-ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10
Inventor 朱志平周艺赵永福周瑜陆海伟付晶
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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