GB/T 15959-1995 in English

《GB/T 15959-1995水质 可吸附有机卤素（AOX ） 的测定 微库仑法》由467（生态环境部）归口，主管部门为生态环境部。
本标准规定了测定水中可吸附在活性炭上的有机卤化物（AOX）的微库仑法，在吸附前必要时先经过吹脱，挥发性的有机卤化化物可以直接测定。本标准适用测定饮用水、地下水、地面水、污水中有机卤化物（AOX），其测定范围为10～400μg/L，如超过上限，可减少取样量。

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.