Determination to total nitrogen in rice with the Dumas Combustion method: Collaborative study
2010
Horita, H., National Food Research Inst., Tsukuba, Ibaraki (Japan)
Nitrogen content in rice was determined by the Dumas combustion method in cooperation with 22 laboratories. Proficiency test by the Kjeldahl methods using same sample was performed with 12 laboratories. HorRat values and RSDsub(R) of 7 samples for the Dumas Combustion method were 0.51 to 0.70, 1.97 to 2.81 % and 0.48 to 0.77 %, respectively, showed that the measuring results of this collaborative trial were satisfying, and this method have a good performance and reproducibility to determine total nitrogen in rice. The value of z-score obtained from the result of proficiency test to determine nitrogen content in rice by the Kjeldahl method performed with various measuring condition, were -0.72 to 0.95, and half of them were -0.2 to 0.2, showed that the Kjeldahl method have a good performance and robustness to determine total nitrogen in rice.
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