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Rapid Determination of Ammonia Nitrogen in Refinery Wastewater by Ammonia Gas Sensitive Electrode

Lin Chunfeng;SINOPEC Maoming Company;  
Determination of ammonia nitrogen in Refinery Wastewater by ammonia gas sensitive electrode,the advantages and disadvantages of the working curve method and standard addition method were compared, and the effect of the concentration of the standard solution in the total ionic strength buffer, interfering ion, and adding method was tested. Results show that S2-, Fe3+, Ca2+, Mg2+, Cl-, oil and other concentration was less than 100 mg/L did not interfere with the determination, the amount of total ionic strength buffer for 5 m L, join in standard solution of ammonia nitrogen concentration is about by liquid ammonia concentration 100 times when. The detection limit was 0.07 mg/L, relative standard deviation was between 3.36 % and 2.02 %, the relative error was between 0.90 % ~3.8 % and the recovery rate was between 92 % and 116. Method has the advantages of simple operation, short analysis time and low cost, and is suitable for the analysis and determination of many water samples.
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