The document discusses various methods for analyzing air pollution, focusing on gaseous pollutant sampling and measurement techniques. It details the requirements for sampling flow rates, sampling periods, and conditions for valid samples, as well as specific wet chemical methods for different pollutants. Additionally, it mentions various analytical methods and offers resources for students and professionals in environmental sciences.

1. Analysis Methods for Measurement of Air
Pollution
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2. Sampling Of Gaseous Pollutants
• Sampling Flow Rate is required as per test
method(0.2 – 1.0 lpm)
• Unfiltered air is bubbled through reagents , which
either react or dissolve the gas of interest.
• Impingers can be arranged in series or parallel.
• Individual flow control.
• Flow adjustment by Rotameter.
• Ice tray.
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3. Gaseous Sampling System
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4. Gaseous Sampling Impinger
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5. Monitoring of Gaseous Pollutants
Sampling Period
• Sampling period are decided based on objectives.
• Care is required in deciding sampling period it should be for duration of available
standard.
Deciding Sampling Reagent
10-30ml is reasonable volume need to be decided based on detection limit of pollutant,
expected ambient concentration and flow rate decided by duration of sampling.
Criteria for valid samples
Accept sample if it has run for 75% of decided sampling duration otherwise reject the
sample.
Sl. No. Period Rate of Sampling/lpm
1. 30 min 2
2. 1 hr. 1
3. 1-4 hr. 0.5
4. 8 hrs. 0.2
5. 8-24 hrs. 0.1-0.2
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6. Wet Chemical Method for Measurement of Gaseous Pollutants
(Ambient Air)
PARAMETER ANALYTICAL METHOD
Sulphur Dioxide - T.C. M Method or Modified Wet & Gaeke Method.
Nitrogen Dioxide - (i) Sodium hydroxide-sodium Arsenite Method or
Modified Jacob Hoceiser’s Method.
- (ii) Saltzman Griess Method
Ozone - (i) Neutral KI Method
(ii) Alkaline KI Method
Hydrogen Sulphide - Alkaline CdSO4 Method
Chloride - Methyl Orange Method
Ammonia - Indophenol blue Method
Fluoride - Sodium hydroxide absorption Method Ion Selective
Electrode or SPADNS analysis.
Phenol - 4-Amino antipyrene Method
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7. Methods for Analysis of Gaseous Pollutants in Ambient and Source
S. No. Pollutant BIS No. Method CPCB EPA No.
1. SO2 Ambient 5182-Part-II As BIS 704
Source Emission Regulation Part-III,
Isopropanol Method
6
2. NOx Ambient 5182-Part-II Jacob Hochheiser Method Emission Regulation Part-III, Jacob
Hochheiser modified method
-
Source - - 7 Phenol disalphonic
Acid Colorimetric
3. O3 Ambient &
Source
5182 – Part – (ix) - -
4. HCI,HBr,HI,HF
Ambient & Source
Specific Electrod Method - 26
5. F2
Ambient & Source
11225-Part-V
SPADNS-Zirconium lead indicator
Emission Regulation Part-III, APHA
Method Selective Ion Electrod
Emission Regulation Part-III EPA
Method Selective Ion Electrod
ENV-Method
-
6. CI2
Ambient & Source
5182-Part-XIX Methyl Orange
NaOH titrated with standard Hypo
-
ENV Method
-
7. NH3
Ambient & Source
11225-Part-VI
Nessler Reagent
- -
8. H2S
Ambient & Source
5182- Part –III Methylene Blue Method - -
9. Mercaptons
Ambient & Source
From Handbook of Air Pollution - -
10. CO
Ambient & Source
5182-Part-X I2O5 Method Indicator Tube
Method NDIR Method Gas Chromatography
- -
11. Pb
Ambient & Source
ISO 9855-1993(E) - -

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