@ pradeep,

I recommend you to refer the book : "The atmospheric chemist's companion : numerical data for use in the atmospheric sciences" by Peter Warneck, Jonathan Williams - Publisher - springer

The book is a compilation of useful data in the area of atmospheric science and emissions (It is not a book on theory or procedures).

Pradeep,

Follow this pollution control board link and refer vol I and II, guidelines for measurements.

CPCB link: http://www.cpcb.nic.in/newitems.php

BTW, 273+25 is temperature correction factor to ambient air temperature of 25 deg C.

Remember this is Kelvin scale temperature.

Thanks for link...

secondly  in reference to the temperature correction, I want to ask is that it is must to take temperature at 25 deg C or we have to take ambient temperature at that particular time for the collection of sample??

Pradeep,

While reporting the concentration values, they must be corrected to NTP conditions (25 deg and 1 atm pressure).

You can find detailed procedure for stack monitoring at link below:

http://www.cpcb.nic.in/newitems/15.pdf

@ Pradeep and Yogesh,

Flow meters are calibrated in standard gas volumes per unit time often refer to volumes at 25 °C. Hence the requirement to correct to 25°C

Refer- IUPAC document (glossary of atmospheric chemical terms)

Link: http://pac.iupac.org/publications/pac/pdf/1990/pdf/6211x2167.pdf

@ pradeep,

I recommend you to refer the book : "The atmospheric chemist's companion : numerical data for use in the atmospheric sciences" by Peter Warneck, Jonathan Williams - Publisher - springer

The book is a compilation of useful data in the area of atmospheric science and emissions (It is not a book on theory or procedures).

1- For ISo-Kinetic sampling- Pressure doesnt matters, Only Kinetic energy/Velociity/Flow of stack gases should be maintained in our sampling train.

2-

In your eqn No 2-

Q!s= Qs* ( 273+25)/Ts……………………(2)

You have to take= 273+ Ambient temperature (At Stack- of course you measure at platform) As you say- temperature of ambient at the time of collection of sample

And in eqn. no 3- You are doing normalization- For flow rate at NTP.

Qm= Qs*{( P!m-Pm)/Patm}* ( Ta/Ta)…… (3)

So here, P!m= Barometric pressure, Pm= Suction pressure at meter (Final P-Initial P), Patm= 760mmHg, Ta/Ta , The denominator Ta is the Ambient temperature at metering point.

3-

Barometric gauge is only solution, Using it, But instead, I google the Barometric pressure of place, before going to sampling... Easy way.

and about links- EPA methods friend- You can easily find.

Method 1: Determining number and location of sampling points

Method 2: Determining stack gas velocity and volumetric flow rate

Method 3: Determining dry molecular weight of the stack gas

Method 4: Determining moisture content of a stack gas

Method 5: Determining particulate emissions from a stationary source

Thanks.

Sorry to have seen this at so late a date. Isokinetic sampling is a meaningless concept. It is unfortunate that it has been so thoroughly accepted by the air sampling community. Harpreet Singh recommended several EPA methods. Most are useless. These are methods that were adopted from practices that were not verified. It is usually accepted that if you follow EPA methods or any other methods required by regulation, then you are compliant with the regulations. This is not correct. Nearly every regulation as the requirement that the sampling method must be demonstrated to be adequate. No one does this, they simply follow the rules.

Isokinetic sampling was a hypothetical construction based on sampling in laminar flow. No practical stack exhaust exhibits laminar flow.

The only way to demonstrate that sampling is adequate is to challenge the sampling system with a known aerosol of the particle size characteristic of the exhaust.

The qualification of a sampling system is addressed in ANSI-HPS N13.1.

thanks for all of your valuable answers.

Great answers ....