SIST ISO 4220:1996 PDF

Name: SIST ISO 4220:1996 — Ambient air - Determination of a gaseous acid air pollution index - Titrimetric method with indicator or potentiometric end-point detection
SKU: SIST ISO 4220:1996
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Ambient air - Determination of a gaseous acid air pollution index - Titrimetric method with indicator or potentiometric end-point detection

Название (английский):

SIST ISO 4220:1996

Ambient air - Determination of a gaseous acid air pollution index - Titrimetric method with indicator or potentiometric end-point detection

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 мая 1996 г.
ICS:: 13.040.20
Технический комитет:: KAZ - Air quality

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Описание (английский):

Is applicable to mass concentrations of sulfur dioxide higher than 30 g/m3. The results obtained following this procedure depend on the amounts of acid and alkaline gaseous air pollutants which are likely to be determined under the specified sampling and analytical conditions.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

SIST ISO 4220:1996 is an international standard established by the International Organization for Standardization (ISO) that specifies a titrimetric method with indicator or potentiometric end-point detection for determining a gaseous acid air pollution index in ambient air. This method is particularly applicable for measuring mass concentrations of sulfur dioxide (SO₂) higher than 30 µg/m³. The procedure evaluates the combined presence of acidic and alkaline gaseous pollutants in ambient air during a specified sampling and analysis period.

The standard guides environmental laboratories and air quality monitoring agencies in quantifying acidic air pollutants, allowing effective monitoring and control of air pollution that directly impacts human health and the environment.

Key Topics

Scope and Application

Applicable to ambient air with sulfur dioxide concentrations greater than 30 µg/m³.
Measures an acid air pollution index accounting for water-soluble acidic gaseous pollutants.

Principle

Acidic gaseous pollutants are absorbed and oxidized into sulfuric acid by hydrogen peroxide solution.
The formed sulfuric acid is then titrated to determine the pollution index using either a visual indicator or potentiometric pH measurement.

Reagents and Solutions

Hydrogen peroxide solution (27–30% w/w) for absorption and oxidation.
Saturated potassium chloride solution for potentiometric titration.
Standardized sulfuric acid and sodium tetraborate solutions for titration.
pH 4.5 absorption solution and buffer solutions for calibration.

Sampling and Analysis

Air sampling is done over 24 or 48 hours using specialized absorbers and filtering equipment compliant with ISO 4219.
Absorbed acid gas pollutants are chemically analyzed by titration to a pH endpoint of 4.5.
Titration can be detected via color change (using specific indicators) or by potentiometric pH meter for higher precision.

Calculations

The acid pollution index is calculated based on titration volumes, sample air volume, and standard titrant concentrations, expressing results as micrograms per cubic meter (µg/m³) equivalent to sulfur dioxide.

Equipment and Quality Control

Borosilicate glass absorbers, pH meters with temperature compensation, and magnetic stirrers are essential for accurate measurements.
Calibration and validation procedures ensure reliability and repeatability.

Applications

SIST ISO 4220:1996 is highly valuable for:

Environmental Monitoring

Continuous assessment of ambient air quality focused on acid gas pollutants, mainly sulfur dioxide.
Supports regulatory compliance and environmental protection agencies in pollution control programs.

Air Pollution Research

Provides a standardized method for comparative air pollution studies globally.
Assists in understanding pollutant dispersion and acid rain precursors.

Industrial Emission Monitoring

Enables monitoring of emissions from power plants, industrial facilities, and urban areas.
Helps in evaluating the effectiveness of pollution mitigation techniques.

Public Health Protection

Quantification of acidic gas pollutants contributes to air quality indices that guide public warnings and health advisories.

Related Standards

ISO 4219: Air Quality – Sampling of Sulfur Compounds

Specifies equipment and procedures for collecting sulfurous compounds from ambient air, complementing ISO 4220's analytical methodology.

ISO 10396: Ambient Air – Determination of Sulfur Dioxide (SO₂) – Ultraviolet Fluorescence Method

An instrumental method offering continuous detection of SO₂, often used alongside titrimetric methods.

ISO 10849: Ambient Air – Determination of Acidic Gases (NO₂ and SO₂)

Focuses on detection of other acid gases relevant for comprehensive acid pollution profiling.

Keywords: ISO 4220, acid air pollution index, sulfur dioxide measurement, titrimetric method, potentiometric titration, ambient air quality, gaseous acid pollutants, air pollution monitoring, sulfur dioxide analysis, environmental standard, ISO air quality standards.

SIST ISO 4220:1996 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

SIST ISO 4219:1995

Air quality - Determination of gaseous sulphur compounds in ambient air - Sampling equipment

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