GB/T 40723-2021
Rubber—Determination the contents of total sulfur and total nitrogen — Automatic analyser method
GB/T 41965-2022
Photography—Processing waste—Determination of total amino nitrogen (microdiffusion Kjeldahl method)
GB/T 42955-2023
Determination of total nitrogen content for fertilizers—Dumas combustion method
NY/T 2542-2014
Fertilizers - Determination of total nitrogen content
DB22/T 1932-2013
GB/T 2441.1-2008
Determination of urea - Part 1:Total nitrogen content
GB/T 8572-2010
Determination of total nitrogen content for compound fertilizers titrimetric method after distillation
GB/T 23835.12-2009
Lithium perchlorate anhydrous - Part 12: Determination of total nitrogen content
GB/T 10511-2008
Determination of total nitrogen content for nitrophosphate - Titrimetric method after distillation
GB/T 17767.1-2008
Determination of organic-inorganic compound fertilizers - Part 1: Total nitrogen content
NY/T 1977-2010
SN/T 3097-2012
Determination of total nitrogen in fertilizers-Combustion
DB37/T 2735-2015
GB/T 10209.1-2008
Determination of monoammonium phosphate and diammonium phoshpate - Part 1: Total nitrogen content
20232410-T-326
Determination of total carbon, nitrogen and sulfur in soil
DB12/T 1023-2020
GB/T 23952-2009
Inorganic chemicals for industrial use - General method for the determination of total nitrogen content - Distillation-acid-base titrations method
GB/T 2441.1-2001
Determination of urea—Determination of total nitrogen content
GB/T 24318-2009
Determination of total nitrogen content in animal feeding stuffs by combustion according to the dumas principle and calculation of the crude protein content
GB/T 23772-2009
Inorganic chemicals for industrial use - General method for the determination of total nitrogen content - Nessler's reagent colorimetric method