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警告：适用本标准的人员应有正规实验室工作的实践经验。本部分并为指出所有可能的安全问题。使用者有责任采取适当的安全和健康措施，并保证符合国家有关法规规定的条件。 本部分规定了亚砷酸盐-亚硝酸盐滴定法和高碘酸盐光度法测定钛铁中锰的含量。 本部分适用于钛铁中锰含量的测定。其中亚砷酸盐-亚硝酸盐滴定法测定范围（质量分数）：1.00%～4.00%；高碘酸盐光度法测定范围（质量分数）：0.10%～1.50%。
Ferrotitanium. Determination of manganese content. Arsenite-salt and sodium-salt titrimetric method and periodate photometric method
本标准规定了原水、锅炉用水和冷却水中亚硝酸盐含量的测定方法。 本标准中分子吸收分光光度法适用于原水、锅炉用水和冷却用水中亚硝酸盐含量为0 mg/L～0.25mg/L的测定；紫外分光光度法适用于原水、锅炉用水和冷却用水中亚硝酸盐含量为0 mg/L～25mg/L的测定。
Analysis of water used in boiler and cooling system.Determination of nitrite
GB/T 6912的本部分规定了锅炉用水和冷却水中硝酸根含量的测定方法。 本部分适用于锅炉用水和冷却水中硝酸根含量（0～40）mg/L水样的测定。
Methods for analysis of water for boiler and for cooling. Determination of nitrates and nitrites. Part 1: Ultraviolet spectrophotometry for nitrates
本标准规定了采用镉还原和光度分析法测定硝酸盐和亚硝酸盐的方法。 本标准适用于乳粉中硝酸盐和亚硝酸盐的测定。 本方法检出极限分别为：硝酸盐1.5mg/kg;亚硝酸盐0.2mg/kg。
Milk powder--Determination of nitrate and nitrite contents
本标准规定了水果、蔬菜及其制品亚硝酸盐和硝酸盐含量的测定方法。 本标准适用于水果、蔬菜及其制品亚硝酸盐和硝酸盐含量的测定。
Fruits,vegetables and derived products--Determination of nitrite and nitrate content
本标准规定了测定大气降水中氟、氯、亚硝酸盐、硝酸盐、硫酸盐的离子色谱法。 本标准适用于大气降水样品中氟、氯、亚硝酸盐、硝酸盐、硫酸盐的测定。 本标准进样品量为：50μL，最低检出浓度分别为：F0.03mg/L、Cl0.03mg/L、NO0.05mg/L、NO30.10mg/L、SO0.10mg/L。
Determination of fluoride,chloride,ntrite,nitrate,salfate in the wet precipitation.Ion chromotography
本标准规定了测定大气降水中亚硝酸盐的N-（1-萘基）-乙二胺光度法。 本标准适用于大气降水样品中亚硝酸盐的测定。 本标准最低检出浓度为0.04mg/L，测定范围为0.01～0.02mg/L。
Determination of nitrite in the wet precipitation.N-(1-naphthyl)-1,2-diaminoethane dihydrochloride spectrophotometry
Determination of fluoride,chloride,ntrite nitrate,salfate in the wet precipitation-Ion chromotography
Determination of nitrite in the wet precipitation-N-(1-naphthyl)-1,2-diaminoethan e dihydrochioride spectrophotometry
Water quality-Determination of nitrogen (nitrite)-Spectrophotometric method
本标准规定了用分光光度法测定饮用水、地下水、地面水及废水中亚硝酸盐氮的方法。 测定上限 当试份取最大体积（50m1）时，用本方法可以测定亚硝酸盐氮浓度高达0.20mg/L。 最低检出浓度 采用光程长为10mm的比色皿，试份体积为50ml，以吸光度0.01单位所对应的浓度值为最低检出限浓度，此值为0.003mg/L。
Water quality--Determination of nitrogen (nitrite)--Spectrophotometric method
本标准适用于原水、锅炉水、冷却水的控制分析。
Methods for analysis of water for boiler and for cooling--The determination of nitrates and nitrites--Ultraviolet spectrophotometry for nitrates
本标准适用于原水、锅炉水、冷却水的控制分析。
Methods for analysis of water for boiler and for cooling--The determination of nitrates and nitrites--Ultraviolet spectrophotometry for nitrites
本标准适用于测定天然水、锅炉水和循环冷却水中亚硝酸。
Methods for analysis of water for boiler and for cooling--The determination of nitrates and nitrites--Alpha-naphthylamine hydrochloride photometric method
Determination of seawater trace nitrite—Flow analysis,diazotization and spectrophotometric detection witha long path length flow cell
4 要求 4.1 外观 外观应符合下列要求： a) 试剂盒包装应完整、洁净、破损； b) 标签、标识应清晰、磨损。 4.2 内容物 试剂盒内应装有检测试剂、测试瓶（管）、标准色卡、说明书等组件，并满足下列要求： a) 各组件应完整、洁净、齐全、标识清晰； b) 试剂应密封、污染、泄漏，液体试剂应澄清透明，试剂外包装应标有标示量； c) 测试瓶（管）应选用色透明的材质，且刻度清晰，密封性良好，渗漏； d) 标准色卡应整洁、污渍、颜色均匀，满足匹配性要求（见4.4）、字迹清晰，且与说明书所示测定范围相符； 注：标准色卡的制作方法及示例见附录A。 e) 说明书印刷清晰、完好。 4.3 装量 4.3.1 液体试剂的净容量应不少于标示量。 4.3.2 粉末试剂每包的净含量符合单次测试要求，粉末试剂的净含量、粉包的数量不少于标示量。 4.4 匹配性 用标准色卡所示色阶对应浓度的标准溶液作为样品进行检测，显色结果符合标准色卡。 4.5 热稳定性 对50 ℃条件下密封热储7 d后的试剂进行检测，结果应符合4.3、4.4的要求。
Rapid detection kits for nitrite，nitrate and ammonia nitrogen in water
Standard Test Methods for Nitrite-Nitrate in Water
Soil quality ― Determination of nitrate, nitrite and ammonium in field-moist soils by extraction with potassium chloride solution ―Part 1: Manual method
本部分规定了天然植物提取物中亚硝酸盐的测定方法。本部分适用于天然植物提取物中亚硝酸盐的测定。
Testing methods for water quality by flow analysis -- Part 2: Nitrite nitrogen and nitrate nitrogen
Foodstuffs. Determination of nitrate and/or nitrite content. HPLC/IC method for the determination of nitrate content of vegetables and vegetable products
Foodstuffs - Determination of nitrate and/or nitrite content - Part 2 : HPLC/IC method for the determination of nitrate content of vegetables and vegetable products
本标准规定了利用气相分子吸收光谱法测定水中的亚硝酸盐氮。
Soil quality－Determination of nitrate, nitrite and ammonium in field-moist soils by extraction with potassium chloride solution－Part 2：Automated method with segmented flow analysis
Standard Test Methods for Nitrite-Nitrate in Water
Reagents. Methods for determination of nitrites impurity
Reagents. Methods for determination of nitrites impurity
5.1x00a0;Both test methods use identical reagents and sample processing. The only difference between the two methods is that one test method is automated and the other is manual. The ranges and interferences are identical. 5.2x00a0;The automated test method is preferred when large numbers of samples are to be analyzed. The manual test method is used for fewer samples or when automated instrumentation is not available. 5.3x00a0;These test methods replace Test Methods D1254 (Nitrite) and D992 (Nitrate). The nitrite test method (Test Method D1254) used a reagent that is considered to be a potential carcinogen. The nitrate test method (Test Method D992) has been shown to have relatively large errors when used in wastewaters and also has greater manipulative difficulties than the test method described herein. 5.4x00a0;Test Method D7781 uses a nitrate reductase enzyme for the reduction of nitrate to nitrite. Cadmium is considered a toxic metal. Also, the heterogeneous cadmium reductant creates greater difficulty than the reduction described in this test method. 1.1x00a0;These test methods cover the determination of nitrite nitrogen, nitrate nitrogen, and combined nitrite-nitrate nitrogen in water and wastewater in the range from 0.05 to 1.0 mg/L nitrogen. Two test methods2 are given as follows: x00a0; Sections Test Method Ax2014;Automated Cadmium Reduction x2007;9 to 18 Test Method Bx2014;Manual Cadmium Reduction 19 to 28 1.2x00a0;These test methods are applicable to surface, saline, waste, and ground waters. It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices. 1.3x00a0;The values stated in either SI or inch-pound units are to be regarded as the standard. No other units of measurement are included in this standard. 1.4x00a0;This standard does not purp......
Standard Test Methods for Nitrite-Nitrate in Water
Meat products. Methods for determination of nitrite
Feeds, mixed feeds and raw material. Methods for determination of nitrate and nitrite
Foodstuffs. Determination of nitrate and/or nitrite content. Part 3. Spectrophotometric determination of nitrate and nitrite content of meat products after enzymatic reduction of nitrate to nitrite
Foodstuffs. Determination of nitrate and/or nitrite content. Part 3. Spectrophotometric determination of nitrate and nitrite content of meat products after enzymatic reduction of nitrate to nitrite
Foodstuffs. Determination of nitrate and/or nitrite content. Part 4. Determination of nitrate and nitrite content in meat products by ion-exchange chromatographic method
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