Research on the Alternatives of Non-ammonia Water in Determination of Total Nitrogen in Water Quality Analysis

According to the regulation GB/T 11894-89,non-ammonia water must be used throughout the determination of total nitrogen in water qauality analysis.The preparation of non-ammonia water,however,needs a lot of time,labor and money,so the non-ammonia water is not suitable for the determination of lots of samples.Ammonia ISM is used to measure the concentration of ammonia in distilled water,newly prepared double distilled water and non-ammonia water;the result shows that the ammonia concentration in newly prepared double distilled water is relatively low(0.80mg/L),and it is close to that of non-ammonia water(0.70～0.90mg/L).They find that the blank experiment (A ≤0.030),standard curve(R2=0.9987),accuracy and preciseness all meet the needs in standard and sample determination while following the GB standard.The results indicate that this method has its value in application.