The 680 ℃ catalytic combustion oxidation method was adopted, and the sample was introduced into a high-temperature combustion tube and a low-temperature reaction tube together with purified gas (high-purity oxygen). The sample passing through the high-temperature combustion tube was catalytically oxidized at high temperature, and both organic and inorganic carbon were converted into carbon dioxide. After the sample passing through the low-temperature reaction tube was acidified, the inorganic carbon was decomposed into carbon dioxide. The carbon dioxide produced in the two reaction tubes was transported by carrier gas and sequentially introduced into the non dispersive infrared gas detector NDIR for CO2 detection. Thus, the total carbon (TC) and inorganic carbon (IC) in the water were measured separately. The difference between total carbon and inorganic carbon is called total organic carbon (TOC). Namely: TOC=TC-IC

1. High temperature catalytic oxidation at 680 ℃ can efficiently oxidize difficult to digest organic carbon, making the product easy to analyze high concentration TOC samples.
2. Higher safety, the combustion furnace heating adopts multiple protections, and the overheat protection circuit is independent of the temperature control system. Overheating can automatically cut off the heating to ensure product safety.
3. Real time traffic monitoring to maintain stable flow paths and ensure data reliability.
4. The instrument automatically discharges waste, acid and feed, and the acid feed rate is controlled stably.
5. Less sample and reagent consumption.
The CO2 detection of NDIR detector has good linearity and accuracy. The CO2 signal is converted into a peak area, and then the TOC value (the difference between TC and IC) is calculated by the built-in data processor.
7. The catalytic combustion oxidation method has strong oxidation ability and can almost oxidize all organic compounds with stable performance. The 680 ℃ combustion method is almost below the melting point of all salts, which can prolong the life of the catalyst and combustion tube, especially when the measured object is a water sample containing salt.
8. The instrument uses a high-resolution 7-inch touch screen, an intelligent system, and a fully Chinese interface, making the interface friendly and easy to operate.
9. Electronic dual refrigeration module and membrane dehydration technology ensure the dehydration efficiency of the entire system to protect the detector.
10. The product is equipped with a needle printer that can print and output according to requirements, and the printed results can be stored for a long time.

Environmental temperature: (1-40) ℃
Relative humidity: （10-85）%
Power supply: (220 ± 10%) VAC 50/60Hz, reliable grounding required
Power: 1200W when the electric furnace is heated up
Acidizing agent: 10% phosphoric acid
Gas source: high-purity oxygen (≥ 99.999%, with preliminary pressure reducing valve)
Injection method: manual injection
Combustion furnace temperature: (680-1200) ℃
Testing time: （2-4）min
Measurement range: (0-1000.0) mg/L (in non diluted state)
Repeatability: ≤ 3%
TC indication error: ± 0.1% F.S or ± 5% (whichever is greater)
IC indication error: ± 0.1% F.S or ± 4% (whichever is greater)
Linear: R2≥99.9%
Response time: （1-4）min

The determination of total organic carbon (TOC) in surface water, groundwater, domestic sewage, and industrial wastewater is applied in environmental monitoring, urban water supply and drainage, disease control, chemical and power industries.