System and method for detecting carbon in water

Abstract

The invention provides a system and a method for detecting carbon in water, the system for detecting carbon in water comprises a carbon dioxide detection unit, and also comprises: a sequential injection unit for feeding a water sample and an acid solution into an aeration tank at different times and feeding the water sample in the aeration tank into an atomizing chamber; the aeration tank which is connected with the sequential injection unit and an aeration gas source, wherein gas provided by the aeration gas source does not contain carbon; an atomizing chamber which is communicated with the sequential injection unit and the carrier gas, wherein an outlet of the atomizing chamber is communicated with a combustion chamber; the combustion chamber, wherein an inlet of the combustion chamber communicates with a fuel gas source, and an outlet of the combustion chamber is connected with a pretreatment unit; and the pretreatment unit which is used for removing water vapor in gas, wherein the pretreated gas is sent to the carbon dioxide detection unit. The system and method have the advantages of accurate detection, no catalyst and the like.

Description

technical field [0001] The invention relates to water quality detection, in particular to a detection system and method for carbon in water. Background technique [0002] At present, in commercial TOC analyzers, the main oxidation methods are as follows: [0003] 1. Supercritical oxidation method. Although supercritical oxidation method has sufficient oxidation effect, it cannot measure water samples with very low TOC concentration. [0004] 2. The disadvantage of the ultraviolet oxidation method is that it is only suitable for water samples with a TOC concentration lower than 2.5mg / L. [0005] 3. The persulfate oxidation method is insufficient for the oxidation of complex water bodies (for example: humic acid, high molecular weight compounds, etc.). [0006] 4. High-temperature combustion oxidation method, high-temperature combustion method is the method with the highest oxidation efficiency of organic matter among all methods, and is suitable for complex water bodies suc...

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Problems solved by technology

[0003] 1. Supercritical oxidation method. Although supercritical oxidation method has sufficient oxidation effect, it cannot measure water samples with very low TOC concentration.

[0004] 2. The disadvantage of ultraviolet oxidation method is that it is only suitable for water samples with TOC concentration lower than 2.5mg / L

[0005] 3. Persulfate oxidation method, insufficient oxidation for complex water bodies (such as humic acid, high molecular weight compounds, etc.)

[0009] 1. Due to the accumulation of organic matter in the catalyst, the background signal increases, resulting in blank pollution;

[0010] 2. After the salt melts at high temperature, it will corrode the catalyst and the combustion tube, resulting in catalyst poisoning and failure;

[0011] 3. For the scheme of using catalyst, the cost of catalyst replacement is high;

[0012] 4. Although the ultra-high temperature combustion oxidation method (1200°C) will not cause catalyst poisoning or blank pollution, the requirements for the material of the oxidation chamber are relatively high, and cracks and air leakage are prone to occur.

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