For the determination of Particulate Matter in air using a High Volume Air Sampler, which of the following corrections have to be done for the estimation of volume of air sampled? i. Correction for Temperature ii. Correction for Pressure iii. Correction for Wind Velocity iv. Correction for Humidity
- AOnly (i)
- B(i) and (ii)Correct
- C(iii) and (iv)
- D(i), (ii), (iii) and (iv)
Solution
Concept
Standardising sampled volume
Step-by-step solution
1. The air volume is converted to standard (reference) conditions, so temperature and pressure corrections are applied.
Explanation
Standard conditions are defined by T and P.
Why the other options are wrong
Wind velocity and humidity corrections are not part of the volume calculation.
Shortcut
Volume → correct for T and P.
Correct answer: B) (i) and (ii)