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Yes, You are all correct. Henry's Law Constant (HLC) for organic compounds is normally given at a reference temperature of either 20/25 degrees C in the literature. Under the CLR guidance, it is required that HLC is corrected to a UK soil temperature of 10 degrees. The correction is based on the Clapeyron equation and several supporting calculations (unfortunately!). These are all given in the EA CLEA briefing note 2 and the USEPA fact sheet (2001). Hope this helps. John P. Massie, Senior Consultant ENVIRON 49 Bath Street Glasgow G2 2DL United Kingdom www.environcorp.com <http://www.environcorp.com/> V: +44 (0)141 352 7205 F: +44 (0)141 352 7219 M: +44 (0)7872377352 [log in to unmask] <mailto:[log in to unmask]> P Please don't print this e-mail unless you really need to. ________________________________ From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of steve wilson Sent: 04 July 2008 09:12 To: [log in to unmask] Subject: Re: Converting Vapour Pressure I think Richard is correct - the Clausius-Clapeyron equation for a liquid/vapor boundary relates vapour pressure to temp. Should be in a text book or Google it. 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. ________________________________ From: Contaminated Land Management Discussion List [mailto:[log in to unmask]] On Behalf Of Richard Colwill Sent: 04 July 2008 08:42 To: [log in to unmask] Subject: Re: Converting Vapour Pressure Hi Scouse, I think it has something to do with the clapeyron equation. Not sure what document it is in though as it's been a while since i've used it. Richard Colwill Contaminated Land Specialist Ground Investigation (Wales) Limited 6 New Mill Court Enterprise Park Swansea SA7 9FG tel: 01792 411013 fax: 01792 411014 mobile: 07980 731326 email: [log in to unmask] P Before printing, please think about the environment The following refers to email messages transmitted from, or on behalf of, Ground Investigation (Wales) Limited. The information contained in this e-mail and its attached files, including replies and forwarded copies, is confidential and intended solely for the addressee(s) and may be legally privileged or prohibited from disclosure and unauthorised use. If you are not the named addressee you may not use, copy or disclose this information to any other person. If you received this message in error please notify the sender immediately and delete all copies of the email and associated files. 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I have looked in the 2 references and cannot work out what equation should be used, can anyone help? Regards Paul Brew MPhil MPhys MRes (Contaminated Land Management) CC Geotechnical Limited Essex House Bridle Road Bootle L30 4UE Email: [log in to unmask] Telephone: 0151 523 0202 Facsimile: 0151 523 0252 Web: www.ccgeotechnical.co.uk <http://www.ccgeotechnical.co.uk> ________________________________ <http://www.ccgeotechnical.co.uk/> ________________________________ REGISTERED IN ENGLAND AND WALES - Company Registration: 5085241 - Registered Name: CC Geotechnical Limited - Registered Office: Essex House, Bridle Road, Bootle, Merseyside L30 4UE. ________________________________ Unless otherwise expressly agreed in writing, nothing stated in this communication shall be legally binding. This email and any attached files are confidential and copyright protected. If you are not the addressee, any dissemination of this communication is strictly prohibited. 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