NY/T 2419-2013 "Determination of Total Nitrogen Content in Plants, Method of Automatic Nitrogen Determination Instrument" specifies the method for the determination of total nitrogen content in plants using automatic nitrogen determination instrument. This standard applies to the precise determination of total nitrogen content in plant samples. The method includes digesting plant samples with hydrogen peroxide sulfate, converting organic nitrogen into ammonium nitrogen, and calculating total nitrogen content after distillation, absorption, titration and other steps. The standard refers to a number of relevant documents, such as GB/T 601 and GB/T 6682, covering standards such as chemical reagent preparation and laboratory water specifications.