HJ/T 43-1999
ActiveStationary source emission-Determination of nitrogen oxide-N(1-naphthyl)-ethylenediamine dihydrochloride spectrophotometric method
固定污染源排气中氮氧化物的测定 盐酸萘乙二胺分光光度法
Catalogue
1 适用范围 → 2 方法原理 → 3 引用标准 → 4 试剂和材料 → 5 仪器 → 6 样品采集与保存 → 7 分析步骤 → 8 计算和结果表示 → 9 精密度和准确度 → 10 说明 1 Scope → 2 Principle of method → 3 Normative references → 4 Reagents and materials → 5 Apparatus → 6 Sample collection and preservation → 7 Analytical procedure → 8 Calculation and expression of results → 9 Precision and accuracy → 10 Remarks
Scope
1.1 This standard is applicable to the determination of nitrogen oxides in organized emissions from stationary sources. 1.2 When the sampling volume is 1 L, the qualitative detection concentration of this method is 0.7 mg/m³, and the quantitative determination concentration range is 2.4~208 mg/m³. Samples with higher concentrations can be determined by dilution. 1.3 Under conditions where ozone concentration is greater than 5 times the nitrogen oxide concentration, and sulfur dioxide concentration is greater than 100 times the nitrogen oxide concentration, there is interference with the determination of nitrogen oxides.
1.1 本标准适用于固定污染源有组织排放的氮氧化物测定。1.2 当采样体积为1 L时，本方法的定性检出浓度为0.7 mg/m³，定量测定的浓度范围为2.4~208 mg/m³。更高浓度的样品，可以用稀释的方法进行测定。1.3 在臭氧浓度大于氮氧化物浓度5倍，二氧化硫浓度大于氮氧化物浓度100倍条件下，对氮氧化物测定有干扰。
Normative References
Keywords
Application Summary AI generated
Environmental monitoring agencies and industrial enterprises use this standard to measure nitrogen oxide concentrations in stationary source emissions. It is used to assess compliance with environmental regulations and to control air pollution. The standard provides a reliable spectrophotometric method, ensuring accurate measurements that are critical for environmental protection and enforcement.
环境监测机构和工业企业使用该标准来测定固定污染源排放的氮氧化物浓度。它用于评估排放是否符合环保法规，并帮助控制大气污染。该标准提供了可靠的分光光度法，确保测量结果准确，对环境保护和执法至关重要。
AI Summary AI generated
This standard specifies the determination of nitrogen oxides in stationary source emissions using the N-(1-naphthyl)-ethylenediamine dihydrochloride spectrophotometric method. It is applicable to organized emissions, with a detection concentration of 0.7 mg/m³ and a quantitative range of 2.4 to 208 mg/m³. The principle involves oxidizing nitrogen oxides to nitrogen dioxide, absorbing to form nitrous acid, then reacting with sulfanilic acid and N-(1-naphthyl)-ethylenediamine dihydrochloride to produce a rose-red color, measured at 540 nm. The standard details reagents, apparatus, sampling, analytical procedures, calculations, and provides precision and accuracy data.
本标准规定了固定污染源排气中氮氧化物的盐酸萘乙二胺分光光度测定方法。适用于有组织排放的氮氧化物测定，检出浓度为0.7 mg/m³，定量范围2.4~208 mg/m³。方法原理为将氮氧化物氧化为二氧化氮后吸收生成亚硝酸，再与对氨基苯磺酸和盐酸萘乙二胺反应显色，用分光光度计在540 nm处测定。标准详细规定了试剂、仪器、采样、分析步骤和计算，并提供了精密度和准确度数据。
Key Sentences extracted from text
本标准适用于固定污染源有组织排放的氮氧化物测定。
在采样时，气体中的一氧化氮等低价氧化物首先被三氧化铬氧化成二氧化氮，二氧化氮被吸收液吸收后，生成亚硝酸和硝酸。
按顺序串联一个空的多孔玻板吸收瓶，一支氧化管(4.10)和两个各装75 ml吸收液(4.9)的多孔玻板吸收瓶(5.2)作为样品吸收装置。
以吸光度对亚硝酸根浓度(μg/ml)，绘制标准曲线，并计算校准曲线的线性回归方程。
五个实验室分析浓度为0.210 mg/L的统一样品，重复性标准偏差0.0015 mg/L，重复性相对标准偏差0.7%。
This standard is applicable to the determination of nitrogen oxides in organized emissions from stationary sources.
During sampling, low-valent oxides such as nitric oxide in the gas are first oxidized to nitrogen dioxide by chromium trioxide, and after being absorbed by the absorption solution, nitrous acid and nitric acid are generated.
Connect in sequence an empty porous glass plate absorption bottle, one oxidation tube (4.10), and two porous glass plate absorption bottles (5.2) each containing 75 ml of absorption solution (4.9) as the sample absorption device.
Plot the standard curve with absorbance against nitrite ion concentration (μg/ml), and calculate the linear regression equation of the calibration curve.
Five laboratories analyzed a unified sample with a concentration of 0.210 mg/L, with a repeatability standard deviation of 0.0015 mg/L, a repeatability relative standard deviation of 0.7%.