Total organic carbon（TOC）is the sum of organic compound in water

and water pollution degree by organic substance can be evaluated comprehensively by TOC detection.TOC detecting technology is researched based on ultraviolet optical absorbable method.The ultraviolet at 254nm on demarcation line of absorption spectrum of organic substance and inorganic substance is used as detecting light source.Lock-in amplifier technology is used to extract weak first harmonic amplitude signal

and TOC concentration measurement is achieved.The results show that this technology has advantages of realtime online

noncontact measurement

small size

and so on

and can be widely used in TOC detection of daily drinking water and industrial water.