HG/T 3526-2011
ActiveIndustrial circulating cooling water determination of nitrate——Spectrophotometric method using sulfosalicylic acid
工业循环冷却水中硝酸盐的测定 磺基水杨酸分光光度法
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、设备 → 6 分析步骤 → 7 结果计算 → 8 允许差 Foreword → 1 Scope → 2 Normative References → 3 Principle of Method → 4 Reagents and Materials → 5 Apparatus and Equipment → 6 Analytical Procedure → 7 Calculation of Results → 8 Permissible Deviation
Scope
This standard specifies the method for the determination of nitrate in industrial circulating cooling water using sulfosalicylic acid spectrophotometry. This standard is applicable to the determination of water samples with nitrate content in industrial circulating cooling water ranging from 0.1 mg/L to 10.0 mg/L.
本标准规定了采用磺基水杨酸分光光度法测定工业循环冷却水中硝酸盐的方法。本标准适用于工业循环冷却水中硝酸盐含量为0.1 mg/L～10.0 mg/L水样的测定。
Normative References
Keywords
Application Summary AI generated
Operators and quality control personnel in industrial circulating cooling water systems use this standard to measure nitrate levels in water. Accurate nitrate determination helps monitor water quality, prevent corrosion and scaling, and ensure safe and efficient system operation. This standard is crucial for effective industrial water treatment and extending equipment lifespan.
工业循环冷却水系统的操作人员和质检人员使用该标准来检测水中的硝酸盐含量。通过准确测定硝酸盐浓度，可以监控水质、防止腐蚀和结垢，确保系统安全高效运行。该标准对于保障工业水处理效果和延长设备寿命具有重要意义。
AI Summary AI generated
This standard specifies a sulfosalicylic acid spectrophotometric method for determining nitrate in industrial circulating cooling water, applicable to nitrate concentrations from 0.1 to 10.0 mg/L. The method relies on the reaction of nitrate with sulfosalicylic acid in alkaline solution to form a yellow derivative, measured at 415 nm. Interferences from calcium/magnesium ions and nitrite are eliminated using NaOH-EDTA and sulfamic acid, respectively. The standard details reagent preparation, calibration curve construction, sample analysis, calculation, and permissible deviations.
本标准规定了用磺基水杨酸分光光度法测定工业循环冷却水中硝酸盐的方法，适用于0.1-10.0 mg/L的硝酸盐含量。方法基于硝酸盐与磺基水杨酸在碱性条件下生成黄色衍生物，在415 nm处测吸光度。通过NaOH-EDTA和氨基磺酸分别消除钙镁离子和亚硝酸盐干扰。标准详细描述了试剂配制、校准曲线绘制、样品测定和结果计算，并给出了允许差。
Key Sentences extracted from text
硝酸盐在碱性溶液中与磺基水杨酸(由水杨酸钠和硫酸组成)反应，生成黄色的酚硝基衍生物，测定其吸光度进行定量。
用NaOH-EDTA溶液消除水样中钙、镁离子的干扰。
用氨基磺酸溶液消除水样中亚硝酸盐的干扰。
在分光光度计上，于415 nm波长处测定吸光度，低浓度使用50 mm吸收池，高浓度使用10 mm吸收池测其吸光度。
取平行测定结果的算术平均值为测定结果；平行测定结果的允许差如表4所示。
Nitrate reacts with sulfosalicylic acid (composed of sodium salicylate and sulfuric acid) in alkaline solution to form a yellow phenolic nitro derivative, and its absorbance is measured for quantification.
Use NaOH-EDTA solution to eliminate interference from calcium and magnesium ions in the water sample.
Use sulfamic acid solution to eliminate interference from nitrite in the water sample.
Measure the absorbance on a spectrophotometer at a wavelength of 415 nm, using a 50 mm absorption cell for low concentrations and a 10 mm absorption cell for high concentrations.
Take the arithmetic mean of parallel determination results as the determination result; the permissible deviation of parallel determination results is shown in Table 4.
Standard Timeline
Changes from replaced version:
- 方法由2,6-二甲基苯酚分光光度法改为磺基水杨酸分光光度法
- The method was changed from 2,6-dimethylphenol spectrophotometry to sulfosalicylic acid spectrophotometry.