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Standard Code | Standard Title | Standard Class | Order |
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GB 4234.9-2023 |
Surgical implants Metallic materials Part 9: Forged high Nitrogen stainless steel 外科植入物 金属材料 第9部分:锻造高氮不锈钢 |
China National Standards Nitrogen |
English PDF |
GB/T 43378-2023 |
Nitrogen for aircraft 飞机用氮气 |
China National Standards Nitrogen |
English PDF |
GB/T 43304-2023 |
Nitrogen oxide blue-green powder for white light LED 白光LED用氮氧化物蓝绿粉 |
China National Standards Nitrogen |
English PDF |
GB/T 20914.5-2023 |
Dies Nitrogen gas springs Part 5: Safety regulations for nitrogen springs 冲模 氮气弹簧 第5部分:氮气弹簧安全规范 |
China National Standards Nitrogen |
English PDF |
GB/T 6609.35-2023 |
Methods for chemical analysis and determination of physical properties of alumina Part 35: Determination of specific surface area Nitrogen adsorption method 氧化铝化学分析方法和物理性能测定方法 第35部分:比表面积的测定 氮吸附法 |
China National Standards Nitrogen |
English PDF |
GB/T 42668-2023 |
Samarium iron Nitrogen bonded permanent magnet powder 钐铁氮粘结永磁粉 |
China National Standards Nitrogen |
English PDF |
GB/T 42955-2023 |
Determination of total Nitrogen content in fertilizers Dumas combustion method 肥料中总氮含量的测定 杜马斯燃烧法 |
China National Standards Nitrogen |
English PDF |
GB/T 42490-2023 |
Soil quality Determination of organic carbon content and carbon isotope ratio, total Nitrogen content and nitrogen isotope ratio in soil and biological samples Stable isotope ratio mass spectrometry 土壤质量 土壤与生物样品中有机碳含量与碳同位素比值、全氮含量与氮同位素比值的测定 稳定同位素比值质谱法 |
China National Standards Nitrogen |
English PDF |
GB/T 42488-2023 |
Soil quality - Determination of 15N abundance of inorganic Nitrogen in soil - Stable isotope ratio mass spectrometry 土壤质量 土壤中无机态氮15N丰度的测定 稳定同位素比值质谱法 |
China National Standards Nitrogen |
English PDF |
GB/T 42485-2023 |
Soil quality Determination of soil nitrate Nitrogen, nitrite nitrogen and ammonium nitrogen KCl solution leaching manual analysis method 土壤质量 土壤硝态氮、亚硝态氮和铵态氮的测定 氯化钾溶液浸提手工分析法 |
China National Standards Nitrogen |
English PDF |
GB/T 42487-2023 |
Soil quality - Determination of soil nitrate Nitrogen, nitrite nitrogen and ammonium nitrogen - potassium chloride solution leaching flow analysis method 土壤质量 土壤硝态氮、亚硝态氮和铵态氮的测定 氯化钾溶液浸提流动分析法 |
China National Standards Nitrogen |
English PDF |
GB/T 41964-2022 |
Photography Washing Waste Liquid Determination of Ammonia Nitrogen Content (Micro-diffusion Method) 摄影 冲洗废液 氨态氮含量的测定 (微扩散法) |
China National Standards Nitrogen |
English PDF |
GB/T 41965-2022 |
Photography Flushing Waste Liquid Determination of Total Content of Ammonia Nitrogen (Micro-diffusion Kjeldahl Nitrogen Method) 摄影 冲洗废液 氨态氮总含量的测定 (微扩散凯氏氮法) |
China National Standards Nitrogen |
English PDF |
GB/T 42263-2022 |
Determination of Nitrogen content in silicon single crystals - Secondary ion mass spectrometry 硅单晶中氮含量的测定 二次离子质谱法 |
China National Standards Nitrogen |
English PDF |
GB/T 41942-2022 |
Natural raw rubber and natural rubber latex - Determination of Nitrogen content - Micro Dumas combustion method 天然生胶和天然胶乳 氮含量的测定 微杜马斯燃烧法 |
China National Standards Nitrogen |
English PDF |
GB/T 41733-2022 |
Determination of carbon residue in organic heat carrier Nitrogen filling method 有机热载体残炭测定法 充氮法 |
China National Standards Nitrogen |
English PDF |
GB/T 40535.1-2021 |
Test methods of continuous nitride ceramic fibers—Part 1:Nitrogen content 连续氮化物陶瓷纤维测试方法 第1部分:氮含量 |
China National Standards Nitrogen |
English PDF |
GB/T 40166-2021 |
Paper and board—Accelerated ageing(exposure to Nitrogen dioxide) 纸和纸板 加速老化(二氧化氮条件下) |
China National Standards Nitrogen |
English PDF |
GB/T 17674-2021 |
Determination of Nitrogen in crude oil -- Boat-inlet chemiluminescence 原油中氮含量的测定 舟进样化学发光法 |
China National Standards Nitrogen |
English PDF |
GB/T 41153-2021 |
Determination of boron, aluminum and Nitrogen impurity content in silicon carbide single crystal -- Secondary ion mass spectrometry 碳化硅单晶中硼、铝、氮杂质含量的测定? 二次离子质谱法 |
China National Standards Nitrogen |
English PDF |
GB/T 40723-2021 |
Rubber—Determination the contents of total sulfur and total Nitrogen — Automatic analyser method 橡胶 总硫、总氮含量的测定 自动分析仪法 |
China National Standards Nitrogen |
English PDF |
GB/T 21287-2021 |
Electronic specialty gas—Nitrogen trifluoride 电子特气 三氟化氮 |
China National Standards Nitrogen |
English PDF |
GB/T 12690.4-2021 |
Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 4: Determination of oxygen and Nitrogen contents—Impulse-infrared absorption and impulse-thermal conductivity method 稀土金属及其氧化物中非稀土杂质化学分析方法 第4部分:氧、氮量的测定 脉冲-红外吸收法和脉冲-热导法 |
China National Standards Nitrogen |
English PDF |
GB/T 223.37-2020 |
Iron, steel and alloy—Determination of Nitrogen content—Indophenol blue spectrophotometric method after distillation separation 钢铁及合金 氮含量的测定 蒸馏分离靛酚蓝分光光度法 |
China National Standards Nitrogen |
English PDF |
GB 7300.601-2020 |
Feed additives-Part 6:Non-protein Nitrogen-Urea 饲料添加剂 第6部分:非蛋白氮 尿素 |
China National Standards Nitrogen |
English PDF |
GB/T 20567-2020 |
Vanadium-Nitrogen 钒氮合金 |
China National Standards Nitrogen |
English PDF |
GB/T 38395-2019 |
Coal tar—Determination of sulfur and Nitrogen content 煤焦油 硫和氮含量的测定 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.8-2019 |
Vanadium-Nitrogen—Determination of silicon, manganese, phosphorus, aluminum content—Inductively coupled plasma atomic emission 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 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.7-2019 |
Vanadium-Nitrogen—Determination of oxygen content—Infrared absorption method 钒氮合金 氧含量的测定 红外线吸收法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.5-2019 |
:Vanadium-Nitrogen—Determination of phosphorus content—Bismuth molybdenum blue spectrophotometric method 钒氮合金 磷含量的测定 铋磷钼蓝分光光度法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.4-2019 |
Vanadium-Nitrogen—Determination of carbon content—Infrared absorption method 钒氮合金 碳含量的测定 红外线吸收法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.3-2019 |
Vanadium-Nitrogen—Determination of nitrogen content—Distillation-neutralization titration method 钒氮合金 氮含量的测定 蒸馏-中和滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.2-2019 |
Vanadium-Nitrogen—Determination of nitrogen content—Thermal conductimetric method after fusion in a current of inert gas 钒氮合金 氮含量的测定 惰性气体熔融热导法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.1-2019 |
Vanadium-Nitrogen—Determination of vanadium content—Ammonium ferrous sulfate titration method 钒氮合金 钒含量的测定 硫酸亚铁铵滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 37588-2019 |
Carbon materials—Determination of Nitrogen content—Dumas combustion method 炭素材料 氮含量的测定 杜马斯燃烧法 |
China National Standards Nitrogen |
English PDF |
GB/T 37528-2019 |
General technical specification for biological filter for Nitrogen removal 脱氮生物滤池通用技术规范 |
China National Standards Nitrogen |
English PDF |
GB/T 36895-2018 |
Water saving enterprises—Nitrogenous fertilizer industry 节水型企业-氮肥行业 |
China National Standards Nitrogen |
English PDF |
GB/T 37186-2018 |
Gas analysis—Determination of sulfur dioxide and Nitrogen oxides—Ultraviolet differential optical absorption spectroscopy 气体分析-二氧化硫和氮氧化物的测定-紫外差分吸收光谱分析法 |
China National Standards Nitrogen |
English PDF |
GB/T 609-2018 |
Chemical reagent—General method for the determination of total Nitrogen 化学试剂 总氮量测定通用方法 |
China National Standards Nitrogen |
English PDF |
GB/T 15076.13-2017 |
Methods for chemical analysis of tantalum and niobium—Part 13: Determination of Nitrogen content—Inert gas fusion thermal conductivity method 钽铌化学分析方法 第13部分:氮量的测定 惰气熔融热导法 |
China National Standards Nitrogen |
English PDF |
GB/T 34532-2017 |
Coking wastewater—Determination of ammonia Nitrogen content—Formaldehyde method 焦化废水 氨氮含量的测定 甲醛法 |
China National Standards Nitrogen |
English PDF |
GB/T 14265-2017 |
General rule of chemical analysis for hydrogen,oxygen,Nitrogen,carbon and sulfur in metallic materials 金属材料中氢、氧、氮、碳和硫分析方法通则 |
China National Standards Nitrogen |
English PDF |
GB/T 13747.22-2017 |
Methods for chemical analysis of zirconium and zirconium alloys—Part 22:Determination of oxygen and Nitrogen contents—Inert gas fusion-infrared absorption and thermal conductivity method 锆及锆合金化学分析方法 第22部分:氧量和氮量的测定 惰气熔融红外吸收法/热导法 |
China National Standards Nitrogen |
English PDF |
GB/T 19143-2017 |
Analytical method of element for carbon,hydrogen ,oxygen and Nitrogen in rock organics 岩石有机质中碳、氢、氧、氮元素分析方法 |
China National Standards Nitrogen |
English PDF |
GB/T 5687.4-2016 |
Nitrogen-bearing ferrochromium and nitride ferrochrome with high nitrogen content—Determination of nitrogen content—The distillation-neutralization titration method 氮化铬铁和高氮铬铁 氮含量的测定 蒸馏-中和滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 35109-2017 |
Static test method of Nitrogen and oxygen separation for molecular sieves 分子筛氮氧分离静态测定方法 |
China National Standards Nitrogen |
English PDF |
GB/T 34500.5-2017 |
Chemical analysis methods for rare earth residue and waste water—Part 5:Determination of ammonia Nitrogen content 稀土废渣、废水化学分析方法 第5部分:氨氮量的测定 |
China National Standards Nitrogen |
English PDF |
GB/T 35582-2017 |
Sulfur and Nitrogen elemental analyzers 硫氮元素测定仪 |
China National Standards Nitrogen |
English PDF |
GB/T 4702.17-2016 |
Chromium metal─Determination of oxygen, Nitrogen and hydrogen content─Inert gas fusion thermal infrared detection method and conductivity method 金属铬 氧、氮、氢含量的测定 惰性气体熔融红外吸收法和热导法 |
China National Standards Nitrogen |
English PDF |
GB 5009.228-2016 |
National Food Safety Standard-Determination of volatile basic Nitrogen in foods 食品安全国家标准 食品中挥发性盐基氮的测定 |
China National Standards Nitrogen |
English PDF |
GB 5009.235-2016 |
National Food Safety Standard - Determination of amino acid Nitrogen in food 食品安全国家标准 食品中氨基酸态氮的测定 |
China National Standards Nitrogen |
English PDF |
GB/T 4702.7-2016 |
Chromium metal─Determination of Nitrogen content─Distillation-nessler reagent spectrophotometric method 金属铬 氮含量的测定 蒸馏分离-奈斯勒试剂分光光度法 |
China National Standards Nitrogen |
English PDF |
GB/T 32737-2016 |
Determination of nitrate Nitrogen in soil—Ultraviolet spectrophotometry method 土壤硝态氮的测定 紫外分光光度法 |
China National Standards Nitrogen |
English PDF |
GB/T 32141-2015 |
Determination of the total volatile basic Nitrogen in feed 饲料中挥发性盐基氮的测定 |
China National Standards Nitrogen |
English PDF |
GB/T 10722-2014 |
Carbon black—Determination of total and external surface area―Nitrogen adsorption test method 炭黑 总表面积和外表面积的测定 氮吸附法 |
China National Standards Nitrogen |
English PDF |
GB/T 11039.4-2014 |
Textiles―Tests for colour fastness―Colour fastness to contaminants―Part 4: Oxides of Nitrogen in the atmosphere at high humidities 纺织品 色牢度试验 耐大气污染物色牢度 第4部分:高湿氧化氮 |
China National Standards Nitrogen |
English PDF |
GB/T 2085.4-2014 |
Aluminum powder―Part 4: Nitrogen atomized aluminum powder 铝粉 第4部分:氮气雾化铝粉 |
China National Standards Nitrogen |
English PDF |
GB/T 30733-2014 |
Determination of total carbon, hydrogen and Nitrogen content in coal―Instrumental method 煤中碳氢氮的测定 仪器法 |
China National Standards Nitrogen |
English PDF |
GB/T 30728-2014 |
Determination of Nitrogen in solid biofuels 固体生物质燃料中氮的测定方法 |
China National Standards Nitrogen |
English PDF |
GB/T 30503-2014 |
General specification for marine Nitrogen gas generator 船用制氮装置通用技术条件 |
China National Standards Nitrogen |
English PDF |
GB/T 4325.23-2013 |
Methods for chemical analysis of molybdenum - Part 23: Determination of oxygen and Nitrogen contents - Inert gas fusion-infrared absorption and thermal conductivity method 钼化学分析方法 第23部分:氧量和氮量的测定 惰气熔融红外吸收法-热导法 |
China National Standards Nitrogen |
English PDF |
GB/T 4324.26-2012 |
Methods for chemical analysis of tungsten - Part 26: Determination of Nitrogen content - Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry 钨化学分析方法 第26部分:氮量的测定 脉冲加热惰气熔融-热导法和奈氏试剂分光光度法 |
China National Standards Nitrogen |
English PDF |
GB/T 5458-2012 |
Liquid Nitrogen biological container 液氮生物容器 |
China National Standards Nitrogen |
English PDF |
GB/T 27894.6-2012 |
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 6: Determination of hydrogen helium oxygen Nitrogen carbon dioxide and C1 to C8 hydrocarbons using three capillary columns 天然气 在一定不确定度下用气相色谱法测定组成 第6部分:用三根毛细管色谱柱测定氢、氦、氧、氮、二氧化碳和C1至C8的烃类 |
China National Standards Nitrogen |
English PDF |
GB/T 17674-2012 |
Determination of Nitrogen in crude oil by boat-inlet chemiluminescence 原油中氮含量的测定 舟进样化学发光法 |
China National Standards Nitrogen |
English PDF |
GB/T 16774-2012 |
Autoboosting caliber liquid Nitrogen container 自增压式液氮容器 |
China National Standards Nitrogen |
English PDF |
GB/T 14174-2012 |
Large caliber liquid Nitrogen container 大口径液氮容器 |
China National Standards Nitrogen |
English PDF |
GB 29202-2012 |
National Food Safety Standard - Food Additive - Nitrogen 食品安全国家标准 食品添加剂 氮气 |
China National Standards Nitrogen |
English PDF |
GB 11666.1-2012 |
Health protection zone for fertilizer industry - Part 1:Nitrogen fertilizer industry 肥料制造业卫生防护距离 第1部分:氮肥制造业 |
China National Standards Nitrogen |
English PDF |
GB/T 27894.5-2012 |
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 5: Determination of Nitrogen,carbon dioxideand C1 to C5 and C6+ hydrocarbons for a laboratory and on-line process application using three columns 天然气 在一定不确定度下用气相色谱法测定组成 第5部分:实验室和在线工艺系统中用三根色谱柱测定氮、二氧化碳和C1至C5及C6+的烃类 |
China National Standards Nitrogen |
English PDF |
GB/T 27894.4-2012 |
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of Nitrogen,carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns 天然气 在一定不确定度下用气相色谱法测定组成 第4部分:实验室和在线测量系统中用两根色谱柱测定氮、二氧化碳和C1至C5及C6+的烃类 |
China National Standards Nitrogen |
English PDF |
GB/T 27885-2011 |
Determination of hydrogen、Nitrogen、carbon monoxide carbon dioxide and C1~C8 hydrocarbons in the coal-based F-T synthetic tail gas - Gas chromatographic method 煤基费托合成尾气中 H2、N2、CO2和C1~C8烃的测定 气相色谱法 |
China National Standards Nitrogen |
English PDF |
GB/T 27884-2011 |
Determination of hydrogen、Nitrogen、carbon monoxide carbon dioxide and methane in the coal-based F-T synthesis feed gas - Gas chromatographic method 煤基费托合成原料气中H2、N2、CO、CO2和CH4的测定 气相色谱法 |
China National Standards Nitrogen |
English PDF |
GB/T 27854-2011 |
Chemicals - Soil microorganisms - Nitrogen transformation test 化学品 土壤微生物 氮转化试验 |
China National Standards Nitrogen |
English PDF |
GB/T 27894.3-2011 |
Natrual gas - Determination of composition with defined uncertainty by gas chromatography - Part 3: Determination of hydrogen,helium,oxyen,Nitrogen,carbon dioxide and hydrocarbons up to C8 using two packed columns 天然气 在一定不确定度下用气相色谱法测定组成 第3部分:用两根填充柱测定氢、氦、氧、氮、二氧化碳和直至C8的烃类 |
China National Standards Nitrogen |
English PDF |
GB/T 4698.7-2011 |
Methods for chemical analysis of titanium sponge,titanium and titanium alloys - Determination of oxygen and Nitrogen content 海绵钛、钛及钛合金化学分析方法 氧量、氮量的测定 |
China National Standards Nitrogen |
English PDF |
GB/T 26251-2010 |
Fluorine and mixed gases of fluorine-Nitrogen 氟及氟氮混合气 |
China National Standards Nitrogen |
English PDF |
GB/T 8572-2010 |
Determination of total Nitrogen content for compound fertilizers titrimetric method after distillation 复混肥料中总氮含量的测定 蒸馏后滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.8-2009 |
Vanadium-Nitrogen alloy - Determination of silicon, manganese, phosphorus, aluminum content - Inductively inductively coupled plasma atomic emission spectrometric method 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 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.7-2009 |
Vanadium-Nitrogen alloy - Determination of oxygen content - The infrared absorption method 钒氮合金 氧含量的测定 红外线吸收法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.6-2009 |
Vanadium-Nitrogen alloy - Determination of sulfur content - The infrared absorption method 钒氮合金 硫含量的测定 红外线吸收法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.5-2009 |
Vanadium-Nitrogen alloy - Determination of phosphorus content - The bismuth molybdenum blue spectrophotometry method 钒氮合金 磷含量的测定 铋磷钼蓝分光光度法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.4-2009 |
Vanadium-Nitrogen alloy - Determination carbon of content - The infrared absorption method 钒氮合金 碳含量的测定 红外线吸收法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.3-2009 |
Vanadium-Nitrogen alloy - Determination of nitrogen content - The distillation-neutralization titration method 钒氮合金 氮含量的测定 蒸馏-中和滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.2-2009 |
Vanadium-Nitrogen alloy - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas 钒氮合金 氮含量的测定 惰性气体熔融热导法 |
China National Standards Nitrogen |
English PDF |
GB/T 24583.1-2009 |
Vanadium-Nitrogen alloy - Determination of vanadium content - The ammonium ferrous sulfate titration method 钒氮合金 钒含量的测定 硫酸亚铁铵滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 10322.8-2009 |
Iron ores - Single-point determination of specific surface area - Nitrogen adsorption method 铁矿石 比表面积的单点测定 氮吸附法 |
China National Standards Nitrogen |
English PDF |
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 杜马斯燃烧法测定饲料原料中总氮含量及粗蛋白质的计算 |
China National Standards Nitrogen |
English PDF |
GB/T 2910.15-2009 |
Textiles - Quantitative chemical analysis - Part 15: Mixtures of jute and certain animal fibres (method by determining Nitrogen content) 纺织品 定量化学分析 第15部分:黄麻与某些动物纤维的混合物(含氮量法) |
China National Standards Nitrogen |
English PDF |
GB/T 23952-2009 |
Inorganic chemicals for industrial use - General method for the determination of total Nitrogen content - Distillation-acid-base titrations method 无机化工产品中总氮含量测定的通用方法 蒸馏-酸碱滴定法 |
China National Standards Nitrogen |
English PDF |
GB/T 23835.12-2009 |
Lithium perchlorate anhydrous - Part 12: Determination of total Nitrogen content 无水高氯酸锂 第12部分:总氮含量测定 |
China National Standards Nitrogen |
English PDF |
GB/T 23772-2009 |
Inorganic chemicals for industrial use - General method for the determination of total Nitrogen content - Nessler’s reagent colorimetric method 无机化工产品中总氮含量测定的通用方法 蒸馏-纳氏试剂比色法 |
China National Standards Nitrogen |
English PDF |
GB/T 6609.35-2009 |
Chemical analysis methods and determination of physical performance of alumina - Part 35: Determination of specific surface area by Nitrogen adsorption 氧化铝化学分析方法和物理性能测定方法 第35部分:比表面积的测定 氮吸附法 |
China National Standards Nitrogen |
English PDF |
GB/T 22923-2008 |
Determination of Nitrogen phosphorus potassium for fertilizers by auto analyzer 肥料中氮、磷、钾的自动分析仪测定法 |
China National Standards Nitrogen |
English PDF |
GB/T 18412.5-2008 |
Textiles - Determination of the residues of pesticides - Part 5: Organic Nitrogen pesticides 纺织品 农药残留量的测定 第5部分:有机氮农药 |
China National Standards Nitrogen |
English PDF |
GB/T 9823-2008 |
Inspection of grain and oils - Determination of total Nitrogen content 粮油检验 植物油料饼粕总含氮量的测定 |
China National Standards Nitrogen |
English PDF |
GB/T 22427.10-2008 |
Starches and derived products - Determination of Nitrogen content 淀粉及其衍生物氮含量测定 |
China National Standards Nitrogen |
English PDF |
GB/T 9695.11-2008 |
Meat and meat products - Determination of Nitrogen content 肉与肉制品 氮含量测定 |
China National Standards Nitrogen |
English PDF |
GB/T 5511-2008 |
Cereals and pulses - Determination of the Nitrogen content and calculation of the crude protein content - Kjeldahl method 谷物和豆类 氮含量测定和粗蛋白质含量计算 凯氏法 |
China National Standards Nitrogen |
English PDF |
GB/T 19227-2008 |
Determination of Nitrogen in coal 煤中氮的测定方法 |
China National Standards Nitrogen |
English PDF |
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