Clive
The usual gas meters used to measure methane and carbon dioxide are not FIDs
- they use an infrared detection system.
Also I am not sure that you can use Gresham tubes for sampling hydrocarbon
vapours (as opposed to methane, ethane, etc) - maybe one of the hydrocarbon
experts can put me right on this one!
Steve Wilson, Technical Director
EPG Limited
Tel 07971 277869
www.epg-ltd.co.uk
-----( Disclaimer )-----
> >
Information contained in this e-mail is intended for the use of the
addressee only, and is confidential and may contain commercially sensitive
material. Any dissemination, distribution, copying or other use of this
communication, other than for which it is explicitly intended, without
the permission of the sender is strictly prohibited. If you have received
this
e-mail in error, please advise the sender immediately and delete it from
your system. Whilst all e-mails are screened for known viruses, the company
cannot accept responsibility for any which have been transmitted.
-----Original Message-----
From: Contaminated Land Management Discussion List
[mailto:[log in to unmask]] On Behalf Of Clive
Williams
Sent: 29 May 2009 10:59
To: [log in to unmask]
Subject: Re: Inert landfill gas/hydrocarbon
A PID may not pick up less volatile components of your hydrocarbon. If
the hotspot you mention was diesel or oil and is quite old the PID will
have little chance of finding anything. An FID might pick more up - your
gas meter is probably an FID, but calibrated to methane. A gresham
tube or tedlar bag sample submitted to the lab for a detailed
hydrocarbon suite should clear the matter up.
|