ISO 7935: Measurement of Sulfur Dioxide (SO2) Mass Concentration
Stationary source emissions - Determination of the mass concentration of sulfur dioxide - Performance characteristics of automated measurement methods
ISO 7935
It is an international standard for the automated measurement of the mass concentration of Sulfur Dioxide (SO2) gas emitted from stationary sources. This standard defines automated analysis methods used for the monitoring and environmental management of gas emissions. SO2 is a gas commonly found in industrial activities, especially in areas such as power generation and the metal industry. Accurate and precise measurements are important due to their environmental impact.
Purpose and Scope of the Standard
ISO 7935 describes methods that accurately and automatically measure the mass concentration of SO2 gas emitted from stationary sources. The standard specifies the technical specifications and requirements necessary to ensure accurate detection of the gas and measurement of its concentration. This standard is used to assess the environmental impact of gas emissions, meet regulatory requirements and optimize emission control in industrial processes.
Sulfur Dioxide (SO2) Measurement Methods
ISO 7935 includes several automated analysis methods for measuring the mass concentration of SO2. Here are the main features of these methods:
- Infrared (IR) Absorption Method: It is based on the principle that SO2 molecules absorb infrared light at a specific wavelength. The amount of this absorption is proportional to the mass concentration of the gas. Infrared spectrometers are used for measurement. Since SO2 has a specific light absorbance at a specific wavelength, the concentration of the gas can be measured directly.
- Chemiluminescence Method: It is based on the principle that SO2 reacts with ozone to produce a light signal. This light signal is directly proportional to the mass concentration of the gas. Chemiluminescence detectors are used in the measurement process.
- Fluorescence Method: It is based on the principle that SO2 molecules produce a fluorescent signal by absorbing ultraviolet (UV) light at a specific wavelength. This fluorescent signal is proportional to the concentration of the gas. UV fluorescence detectors are used in measurement processes.
- Diffusion Method: It is based on the principle that the gas is absorbed by a filter or a permeable material and then this absorption is converted into mass concentration. This method is often used in industrial applications to determine the concentration of gas in the environment. Gas diffusion cells are used in measurement processes.
What are the Application Areas of the Standard?
ISO 7935 has a wide range of applications for monitoring gas emissions:
- Power Generation Plants: Monitoring SO2 emissions from gas turbines and steam generators.
- Petrochemical and Chemical Industry: Monitoring SO2 emissions from chemical processes and reactors.
- Waste Incineration Plants: Monitoring of SO2 gases generated during waste incineration.
- Metal Industry: Control of SO2 gases from metal processing.
- Environmental Monitoring Systems: In systems used for control of SO2 gas pollution and regulatory requirements.
Nanolab Laboratories Group continues to provide services within the scope of Stationary Source Emissions. We also provide services in Emission - Imission Measurements.
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