1 Application scope
This standard specifies fixed potential by electrolysis method for determining nitrogen oxides in stationary source emission.
It is applicable to the determination of nitrogen oxides in stationary source emission.
The detection limit of nitric oxide is 3mg/m3 (calculated in NO2) and that of nitrogen dioxide is 3mg/m3 when the method of this standard is adopted. The lower limit of determination is 12mg/m3 for nitric oxide (calculated in NO2) and 12mg/m3 for nitrogen dioxide.
2 Normative references
The following documents or provisions therein are quoted in this standard. For undated references, the valid versions apply.
GB/T 16157 The determination of particulates and sampling methods of gaseous pollutants emitted from exhaust gas of stationary source
HJ/T 76 Specification and test procedures for continuous emission monitoring systems of flue gas emitted from stationary sources (on trial)
HJ/T 373 Technical specifications of quality assurance and quality control for monitoring of stationary pollution source
HJ/T 397 Technical specifications for emission monitoring of stationary source
3 Terms and definitions
3.1 nitrogen oxides
nitrogen oxides in forms of nitric oxide (NO) and nitrogen dioxide (NO2) in the stationary source emission
3.2 calibration span
the upper calibration limit of the instrument is the concentration of calibration gas used for calibration (the maximum concentration of calibration gas used for calibration shall prevail in case of multi-point calibration) The calibration span (hereinafter referred to as C.S.) shall be selected appropriately, and the determined average concentration of gaseous pollutants shall be between 20% and 100% of C.S. and shall not exceed C.S. In order to achieve the data quality object, the too high C.S. shall not be adopted when low-concentration nitrogen oxides (NOx) are determined. C.S. shall be less than or equal to the full span of the instrument
Foreword i
1 Application scope
2 Normative references
3 Terms and definitions
4 Method principle
5 Interference and elimination
6 Reagents and materials
7 Apparatuses
8 Sampling location and sampling point
9 Analytical procedures
10 Calculation and expression of results
11 Precision and accuracy
12 Quality assurance and quality control
13 Precautions
Annex A (Informative) Review table for instrument performance before and after determination
