GB/T 15959-1995
Water quality--Determination of adsorbable organic halogens (AOX)--Microcoulometric method (English Version)
- Standard No.
- GB/T 15959-1995
- Language
- Chinese, Available in English version
- Release Date
- 1995
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 15959-1995
- Scope
- This standard stipulates the microcoulometry method for the determination of organic halides (AOX) that can be adsorbed on activated carbon in water. Before adsorption, it must be blown off if necessary, and volatile organic halides can be directly measured. This standard applies to the determination of organic halides (AOX) in drinking water, groundwater, surface water, and sewage. The measurement range is 10-400 μg/L. If the upper limit is exceeded, the sampling amount can be reduced. If the organic carbon dissolved in the water sample is >10mg/L, and the inorganic chloride content is >1g/L, it must be diluted before analysis. When there are suspended solids in the water sample, the organic halogen compounds contained in it are also included in the measured value. In order to avoid colloidal interference that may be formed when activated carbon is separated from the water phase, filter aids such as diatoms need to be added to make the carbon flocculate to overcome the difficulty of filtration. When the water sample contains active chlorine, the value of AOX will be high; therefore, sodium sulfite should be added immediately after sampling. When there are insoluble inorganic chlorides and biological cells (such as microorganisms and algae) in the water sample, the sample needs to be acidified first, and then analyzed after standing for 8 hours. Inorganic iodides can interfere with adsorption and detection, organic iodides can lead to insignificantly high results, and high concentrations of inorganic bromides can also interfere.
GB/T 15959-1995 history
- 1995 GB/T 15959-1995 Water quality--Determination of adsorbable organic halogens (AOX)--Microcoulometric method
