Feasibility Study on Determination of Total Nitrogen Content in Organic Fertilizer by Dumas Combustion Method
The precision and recovery of the determination of total nitrogen content in organic fertilizers by Dumas combustion method and the method in industry standard"Organic Fertilizer"(NY/T 525-2021)are investigated.The results show that the total nitrogen mass fraction of the five organic fertilizer samples measured by the method in NY/T 525-2021 is 1.76%to 3.83%,and the recovery is 99.5%to 101.0%.The mass fraction of total nitrogen in five organic fertilizer samples measured by Dumas combustion method is 1.70%to 3.84%,and the recovery is 98.1%to 104.7%.The relative standard deviation of the two methods is 0.18%to 2.45%,both of which can meet the requirements of the determination of total nitrogen content in organic fertilizer.Compared with the method in NY/T 525-2021,Dumas combustion method has the characteristics of convenient and safe operation,high degree of automation and short measurement time.
NETL
NSTL
万方数据
