GB/T 42490-2023
Soil quality—Determination of total content and isotope ratio of organic carbon and nitrogen of soil and biological samples—Stable isotope ratio mass spectrometry
GB/T 21704-2008
Determination of non-protein-nitrogen content in milk and dairy products
GB/T 24583.1-2019(\u82f1\u6587\u7248)
钒氮合金 钒含量的测定 硫酸亚铁铵滴定法
GB/T 33046-2016(\u82f1\u6587\u7248)
橡胶制品 钴含量的测定 原子吸收光谱法
GB/T 23952-2009
Inorganic chemicals for industrial use - General method for the determination of total nitrogen content - Distillation-acid-base titrations method
SN/T 3382-2012
GB/T 9695.11-2008
Meat and meat products—Determination of nitrogen content
GB/T 24583.5-2019(\u82f1\u6587\u7248)
钒氮合金 磷含量的测定 铋磷钼蓝分光光度法
GB/T 23772-2009
Inorganic chemicals for industrial use - General method for the determination of total nitrogen content - Nessler's reagent colorimetric method
NB/SH/T 0704-2010
Standard test method for nitrogen in petroleum and petroleum products by boat-inlet chemiluminescence
20240837-T-469
Determination of nitrogen content in benzene products of coal carbonization
GB/T 6730.44-2017(\u82f1\u6587\u7248)
铁矿石 锌含量的测定 1-(2-吡啶偶氮)-2-萘酚分光光度法
SN/T 4302-2015
Rapid determination of tris (1-aziridinyl) phosphine oxide (TEPA) in textiles - GC-MS method
GB/T 9695.11-1988
Meat and meat products—Method for determination of nitrogen content
GB/T 17674-1999
Determination of nitrogen in petroleum and petroleum products by chemiluminescence method
SH/T 0171-1992
GB/T 24583.8-2019(\u82f1\u6587\u7248)
钒氮合金 硅、锰、磷、铝含量的测定 电感耦合等离子体原子发射光谱法
\u0413\u041e\u0421\u0422 34111-2017
Juice products. Determination of nitrogen content by Kjeldahl method
KS M 2112-2011(2021)
Crude petroleum and petroleum products —Determination of nitrogen content
KS H ISO 3188-2008(2023)
Starches and derived products-Determination of nitrogen content by the Kjeldahl method-Titrimetric method