氨氮蒸馏选择不同的吸收液对氨氮测定的影响

Ammonia distillation choose different absorption liquid on the determination of ammonia nitrogen

通过实验比对,国标HJ535-2009水质氨氮的测定中预处理蒸馏中,所用吸收液硼酸溶液的吸收率不如用稀盐酸、稀硫酸以及无氨水做吸收液的吸收率高。本文提出去掉硼酸吸收液,改用别的吸收液。

Ammonia：nitrogen in water mainly exists in the form of free ammonia orammonium salt, depending on whether the pH value of water, pH value is high,a higher proportion of free ammonia and ammonium salt, a high proportion ofwater temperature is the opposite. Determination of ammonia nitrogen is one of the impor- tant projects of environmental monitoring. At present, the method of determination of ammonia are Nessler＇s colorimetry, salicylic ac- id andhypochlorite colorimetric method. Nessler＇s colorimetry is simple, sensitive and high operation, is the most commonly used method for the determination ofammonia nitrogen. Nessler＇s method, water, calcium and iron and other metal ions, color, tur- bidity interference can be through the flocculation precipitation and distillation method to do some preprocessing. This chapter isthedistillation of the absorption liquid makes discussion on. Abstract： through experiments, GB HJ535-2009 water qual- ity determination of ammonia nitrogen in the pretreatment of dis- tillation, the absorption liquid of boric acid solution as absorption rate with dilute hydrochloric acid, sulfuric acidand non ammonia water absorption liquid absorption rate as high as. This paper pro- poses to remove boric acid absorption liquid, to other absorption liquid.