TOC Total Organic Carbon Concept and Analysis Method
Total organic carbon refers to the total amount of carbon in dissolved and suspended organic matter in water. There are many kinds of organic substances in water, and it is not possible to separate and identify them at present. Often expressed as "TOC". The TOC is a comprehensive indicator of rapid verification, which uses the amount of carbon to represent the total amount of organic matter in the water. However, because it does not reflect the type and composition of organic matter in water, it does not reflect the different pollution consequences caused by the total amount of total organic carbon. Since the TOC is measured by the combustion method, the organic matter can be completely oxidized, which is more directly indicative of the total amount of organic matter than the BOD5 ( American Anno Boid Analyzer ) or COD. It is often used as an important basis for assessing the degree of organic matter contamination in water bodies.
When the composition of a certain industrial wastewater is relatively stable, the TOC emission standard can be specified according to the relationship between the total organic carbon of the wastewater and the biochemical oxygen demand and chemical oxygen demand, which can greatly improve the efficiency of the monitoring work. In the measurement, the organic carbon in the sample is first converted into carbon dioxide by catalytic combustion or wet oxidation, and the generated carbon dioxide can be directly measured by an infrared detector, or converted into methane, and measured by a hydrogen flame ionization detector, and then Convert carbon dioxide content to carbon content.
In recent years, various types of TOC analyzers have been developed at home and abroad. According to different working principles, it can be divided into combustion oxidation-non-dispersive infrared absorption method, conductance method, meteorological chromatography method, wet oxidation-non-dispersive infrared absorption method and the like. Among them, the combustion oxidation-non-dispersive infrared absorption method only needs one-time conversion, and the flow is simple, the reproducibility is good, and the sensitivity is high. Therefore, the TOC analyzer is widely used at home and abroad.
This article published by the shadow finishing Ltd. Connaught Instrument (Shanghai)
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