Determination of total organic carbon in water by wet chemical oxidation technology (CAT#: STEM-PPA-0113-LJX)

Introduction

With the continuous development of social economy, water environment pollution is becoming more and more serious, and various organic pollutants in water bodies are diversified and complicated. In the water supply industry, the quality of domestic water and source water, especially the control of organic pollutants, has become a matter of public concern.
Total organic carbon (TOC) is a comprehensive index that reflects the total amount of organic matter in the water body by carbon content, which can directly reflect the degree of pollution by organic matter in the water body. Total organic carbon (TOC) is a comprehensive index that reflects the total amount of organic matter in the water body by carbon content, which can directly reflect the degree of pollution by organic matter in the water body.
The determination of total organic carbon in water by wet oxidation technology has high accuracy and good reproducibility, which meets the requirements of laboratory analysis, and is suitable for the determination of TOC in source water and drinking water.

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Principle Applications Procedure Materials Notes Related Products

Principle

Both inorganic carbonates and organic pollutants in water contain carbon, and their total amount is called total carbon (TC). The carbon in all inorganic carbonates is called total inorganic carbon (TIC), and the carbon in all organic matter is called total organic carbon (TOC).
The wet oxidation method can detect TIC, TOC and TC in the same sample simultaneously. The water sample enters the digestion reactor through the automatic sampling loop tube, reacts with 5%(v/v) phosphoric acid at first, and the CO2 produced by decomposition is blown out by high purity nitrogen, and then enters the gas infrared detector (NDIR) to detect TIC after dehumidification through the drying tube. Then sodium persulfate oxidant was added to the digester to react quickly with various organic matter in the water sample at 100℃, and the CO2 produced by decomposition was also entered into the gas infrared detector to detect TOC. The amount of CO2 detected is proportional to the amount of TIC and TOC in the water sample, respectively.

Applications

For the determination of total organic carbon in liquids

Procedure

1. The water sample enters the digestion reactor through the automatic sampling loop
2. The inorganic carbonate in the water sample reacts with 5%(v/v) phosphoric acid, and the CO2 produced by decomposition is blown out by high-purity nitrogen, which is dehumidified through the drying tube and then enters the gas infrared detector (NDIR) for TIC detection
3. Sodium persulfate oxidizer is added to the digester to react rapidly with various organic matter in the water sample at 100℃, and the CO2 generated by decomposition is also entered into the gas infrared detector to detect TOC
4. The sum of TIC and TOC is the TC content

Materials

• Sample Type:
Water

Notes

The container used for sampling must be kept clean and free of organic contamination.

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