HG/T 3516-2011
AbolishedIndustrial circulating cooling water--Determination of nitrite--Molecular absorption spectrometric method
工业循环冷却水中亚硝酸盐的测定 分子吸收分光光度法
Catalogue
前言 → 1 范围 → 2 规范性引用文件 → 3 方法提要 → 4 试剂和材料 → 5 仪器 → 6 试样的制备 → 7 分析步骤 → 8 结果计算 → 9 允许差 → 10 试验报告 → 附录A → 附录B Foreword → 1 Scope → 2 Normative References → 3 Principle → 4 Reagents and Materials → 5 Apparatus → 6 Preparation of Test Sample → 7 Analytical Procedure → 8 Calculation of Results → 9 Permissible Deviation → 10 Test Report → Annex A → Annex B
Scope
This standard specifies the method for the determination of nitrite in industrial circulating cooling water by molecular absorption spectrometry. This standard is applicable to the determination of nitrite content in industrial circulating cooling water in the range of 0.062 mg/L to 0.25 mg/L, and is also applicable to the determination of nitrite in drinking water, domestic water and wastewater.
本标准规定了采用分子吸收分光光度法测定工业循环冷却水中亚硝酸盐的方法。本标准适用于工业循环冷却水中亚硝酸盐含量在0.062 mg/L～0.25 mg/L的测定，也适用于饮用水、生活用水和废水中的亚硝酸盐的测定。
Normative References
Keywords
Application Summary AI generated
Water quality laboratories and industrial water treatment companies use this standard to measure nitrite levels in circulating cooling water. The molecular absorption spectrometric method provides accurate quantification, aiding in corrosion control and water quality management. This standard is crucial for ensuring safe industrial operations and environmental compliance.
水质分析实验室和工业水处理企业使用该标准来检测循环冷却水中的亚硝酸盐含量。通过分子吸收分光光度法，可以准确测定亚硝酸盐浓度，帮助控制水质和防止腐蚀。该标准对于保障工业水系统的安全运行和环境保护具有重要意义。
AI Summary AI generated
This standard specifies a molecular absorption spectrometric method for determining nitrite in industrial circulating cooling water, applicable to concentrations from 0.062 to 0.25 mg/L, and also for drinking water and wastewater. The principle involves reaction of nitrite with reagents under acidic conditions to form a pink dye, measured at 540 nm. The standard details reagents, apparatus, analytical procedure, calculation, and permissible deviation (parallel results within 0.02 mg/L). Annexes cover interferences and operational precautions.
本标准规定了用分子吸收分光光度法测定工业循环冷却水中亚硝酸盐的方法，适用于0.062-0.25 mg/L范围，也用于饮用水和废水。原理是在酸性条件下亚硝酸盐与试剂反应生成粉红色染料，在540 nm测吸光度。标准详细列出了试剂、仪器、分析步骤、结果计算和允许差（平行测定差值≤0.02 mg/L）。附录说明了干扰物质和操作注意事项。
Key Sentences extracted from text
在pH=1.9和磷酸存在下，试料中的亚硝酸盐与4-氨基苯磺酰胺试剂反应生成重氮盐，再与N-(1-萘基)-1,2-乙二胺二盐酸盐溶液反应形成一种粉红色的染料，在540 nm处测量其吸光度。
本标准适用于工业循环冷却水中亚硝酸盐含量在0.062 mg/L～0.25 mg/L的测定，也适用于饮用水、生活用水和废水中的亚硝酸盐的测定。
取平行测定结果的算术平均值作为测定结果，平行测定结果的差值不大于0.02 mg/L。
试样校正后的吸光度(A,)由式(1)给出：A,=A。-Ab。
亚硝酸盐(以氮计)的含量以质量浓度ρN计，数值以毫克每升(mg/L)表示，按式(3)计算：ρN=mN/V。
In the presence of pH=1.9 and phosphoric acid, nitrite in the test sample reacts with 4-aminobenzenesulfonamide reagent to form a diazonium salt, which then reacts with N-(1-naphthyl)-1,2-ethylenediamine dihydrochloride solution to form a pink dye, and the absorbance is measured at 540 nm.
This standard is applicable to the determination of nitrite content in industrial circulating cooling water in the range of 0.062 mg/L to 0.25 mg/L, and is also applicable to the determination of nitrite in drinking water, domestic water and wastewater.
The arithmetic mean of the parallel determination results is taken as the determination result, and the difference between parallel determination results shall not exceed 0.02 mg/L.
The corrected absorbance of the test sample (A,) is given by formula (1): A, = A. - Ab.
The content of nitrite (as nitrogen) is expressed as mass concentration ρN in mg/L, calculated by formula (3): ρN = mN / V.
Standard Timeline
Changes from replaced version:
- 将原标准名称中的“分光光度法”改为“分子吸收分光光度法”
- 增加了“干扰”（见附录A）
- 增加了“操作注意事项”（见附录B）
- Changed 'spectrophotometric method' in the original standard name to 'molecular absorption spectrometric method'
- Added 'Interferences' (see Annex A)
- Added 'Operational precautions' (see Annex B)