TOC, known as Total Organic Carbon, represents the content of organic matter in water based on the amount of carbon, referring to the total quantity of suspended organic matter and dissolved carbon in water. Simply put, TOC Online Analyzers can be used to monitor the TOC levels in water in real time, thereby assessing the condition of organic matter in the water.

Real-time monitoring of TOC in water is relatively more effective in indicating the content of organic matter compared to BOD and COD. Therefore, it serves as an important basis for determining the extent of organic pollution in water bodies. If you want to improve the efficiency of water quality monitoring, you can establish TOC emission standards by comparing the relationships between TOC, BOD, and COD in wastewater. Below, let’s learn about monitoring TOC in water with Modi.

Let’s take a look at the Hangzhou Modi TOC-8000—Total Organic Carbon Online Analyzer. This instrument adopts the non-dispersive infrared (NDIR) colorimetric method. During the detection process, the pre-treated water sample is first injected into the digester using a injection pump. Additionally, inorganic substances in the water sample need to be converted (using strong acid) into carbon dioxide gas, which then escapes from the separator. At this stage, the organic matter in the water sample reacts with the strong oxidizing agent in the reagent, oxidizing TOC into carbon dioxide gas, which then enters the condenser (driven by a carrier gas). Once the gas is condensed, any solid particles and interfering substances are filtered out, and the gas is sent to the measurement chamber for photoelectric signal detection. The signal output by the NDIR is related to the concentration of carbon dioxide gas and, consequently, to the TOC in the water sample being measured. This allows the TOC content in the water to be measured by detecting the signal.

The key features of this water quality monitoring instrument are its fully automated operation, eliminating the need for manual supervision. It is capable of performing intelligent functions such as automatic zero adjustment, calibration, and measurement.