This standard specifies the combustion oxidation-nondispersive infrared absorption method of total organic carbon (TOC) in surface water, underground water, domestic sewage and industrial sewage.
This standard is applicable to the determination of TOC in surface water, underground water, domestic sewage and industrial sewage with detection limit at 0.1mg/L and low determination limit at 0.5mg/L.
Note 1: In this standard, determination of TOC is carried out by subtraction method (3.1) and direct method (3.2). When such volatile organic substances have a higher content in the water as benzene, methyl benzene, cyclohexane and trichloromethane, subtraction method should be used; when the volatile organic compounds are less in the water but inorganic carbon has a higher content in the water, the direct method should be used.
Note 2: When element carbon particle (soot), carbide, cyanide, cyanate and thiocyanate exist, they may be determined together with organic carbon.
Note 3: If large-particle suspended matter is contained in the water, the all-particle organic carbon is not included in the determination result limited by the hole diameter of automatic sampler.
