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The measurement methods for total nitrogen in wastewater containing a high concentration of nitrogenwere evaluated. (1) The UV spectrophotometry, (2) reduction-distillation Kjeldahl, (3) total Kjeldahl nitrogen,method was simple, but it produced large errors deriving from the dilution of samples and calibration standards.While, the reduction-distillation Kjeldahl method didn't need dilution, but the amount of Devarda's alloy andNaOH lead to large errors up to 50 mg/L. The levels of total nitrogen measured by each method were asfollows: reduction-distillation Kjeldahl (568.6. 38.7 mg/L) > UV spectrophotometry (527.3. 9.6 mg/L) > total. Corresponding authorPhone : +82-(0)54-279-2281 Fax : +82-(0)54-279-8299E-mail: yschang@postech.ac.kr26 .......Analytical Science & TechnologyKjeldahl nitrogen method (494.7. 21.4 mg/L) > ion chromatography method (417.9. 7.3 mg/L). Therefore,the reduction-distillation Kjeldahl method is preferred for wastewater with the high concentration of nitrogen.Optimal conditions for each experimental procedure, however, are needed to be confirmed, and the StandardOperation Procedure (SOP) for total nitrogen is required for reliable measurements.