title: [Study on the method for the determination of nitric nitrogen, ammoniacal nitrogen and total nitrogen in plant].
abstract: This paper reports the determination of three nitrogen states in plants: nitric nitrogen, ammoniacal nitrogen and total nitrogen. The plant sample was digested by the Kjeldathl method with H2SO4 + H2O2. The solution of the sample was determined by three methods: absorption photometric method, indigotic colorimetry, and UV absorption photometric method after K2S2O8 oxidation. By comparing the results, the relationship among the three N states is that the total N = NH4+ + NO3-. Suitable methods were found for the determination of the elements, thus providing a scientific basis for the selection of suitable methods for chemical element analysis in plants.
authors.affiliation: College of Life Science, Zhejiang University, Hangzhou 310029, China.
authors.forename: Wei-xian
authors.initials: WX
authors.lastname: Lü
authors.forename: Ying
authors.initials: Y
authors.lastname: Ge
authors.forename: Jian-zhi
authors.initials: JZ
authors.lastname: Wu
authors.forename: Jie
authors.initials: J
authors.lastname: Chang
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009573:Nitrites / Q000032:analysis / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis*; D009586:Nitrogen Fixation; D010084:Oxidation-Reduction; D010944:Plants / Q000737:chemistry*; D012015:Reference Standards
chemical_list: D009573:Nitrites; D000641:Ammonia; D006861:Hydrogen Peroxide; D009584:Nitrogen