ISO 11338 - PAHs

Question 1

What does the term PAHs stand for?

ISO 11338 - PAHs

Answer 1

Polycyclic Aromatic Hydrocarbons

ISO 11338 - PAHs

Question 2

What defines a PAH?

ISO 11338 - PAHs

Answer 2

Contain 2 or more fused aromatic rings of just carbon and hydrogen

ISO 11338 - PAHs

Question 3

What are the major sources of PAHs?

ISO 11338 - PAHs

Answer 3

Aluminium smelters, coal works, waste incinerators and power stations

ISO 11338 - PAHs

Question 4

What are the 3 different equipment configurations for sampling PAHs?

ISO 11338 - PAHs

Answer 4

1. Filter / condenser method
2. Dilution method
3. Cooled probe method

ISO 11338 - PAHs

Question 5

Name the 3 normative references in ISO 11338

ISO 11338 - PAHs

Answer 5

ISO 4225 - air quality general aspects
ISO 9096 - determination of dust
ISO 12141 - determination of dust

ISO 11338 - PAHs

Question 6

Name the 6 analysis techniques for quantifying PAHs

ISO 11338 - PAHs

Answer 6

1. HPLC
2. Fluorescence detector
3. Diode array
4. GC-FID/MS
5. HR GC-MS
6. GC-QqQ

ISO 11338 - PAHs

Question 7

When is a leak check required?

ISO 11338 - PAHs

Answer 7

Before and after the sampling run

ISO 11338 - PAHs

Question 8

What should the samples be protected from both during and after sampling?

ISO 11338 - PAHs

Answer 8

Light

ISO 11338 - PAHs

Question 9

How many days following sampling should the samples be extracted?

ISO 11338 - PAHs

Answer 9

7 days (ideally 24 hours)

ISO 11338 - PAHs

Question 10

At what temperature does the standard require samples post-sampling to be stored at?

ISO 11338 - PAHs

Answer 10

-7°C (EA allow transportation at < 25°C)

ISO 11338 - PAHs

Question 11

What is the allowable leak?

ISO 11338 - PAHs

Answer 11

< 5% of expected sample flow

ISO 11338 - PAHs

Question 12

List the 4 permissible sampling train materials?

ISO 11338 - PAHs

Answer 12

Glass | Quartz | Titanium | PTFE

ISO 11338 - PAHs

Question 13

Filter / Condenser / Absorber Method
What are the sample flowrate and exit temperature requirements?

ISO 11338 - PAHs

Answer 13

Sample gas flowrate between 1 and 6 m³/hr (16 to 100 l/min)
Temperature after the condenser should be < 20°C

ISO 11338 - PAHs

Question 14

What temperature should the filter be heated to?

ISO 11338 - PAHs

Answer 14

Above the stack gas dewpoint, nominally 120°C

ISO 11338 - PAHs

Question 15

What shall the measurement uncertainty value at the daily ELV not exceed

ISO 11338 - PAHs

Answer 15

± 25% on a dry gas basis before correction to oxygen

ISO 11338 - PAHs