Hi Alison, You're right about hcc140a - I'd missed that because of the hyphen in the IUPAC name trichloro-ethane. In my view the hyphen doesn't belong there (try googling trichloro-ethane) if the IUPAC standard is strictly followed - should be trichloroethane. If others agree maybe we should clean out the hyphens from the definitions in a future update?
Cheers, Roy. I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address. ________________________________ From: CF-metadata <[email protected]> on behalf of Alison Pamment - UKRI STFC <[email protected]> Sent: 08 April 2019 17:24 To: [email protected] Subject: Re: [CF-metadata] New halocarbon standard name requests Dear Dan and Roy, Thank you Dan for proposing these six new names and to Roy for the careful checking. Roy is correct that mole_fraction_of_carbon_tetrachloride_in_air already exists in the standard name table. In fact we have eight existing carbon_tetrachloride quantities but only one of them (tendency_of_atmosphere_moles_of_carbon_tetrachloride) mentions the IUPAC name, tetrachloromethane, in its definition. Although we don't need a new name, I will update the existing ones to add the IUPAC information to the definitions. The proposed name mole_fraction_of_methyl_chloroform_in_air doesn't currently exist in the standard name table. However, we do have the name mole_fraction_of_hcc140a_in_air defined as : ' "Mole fraction" is used in the construction "mole_fraction_of_X_in_Y", where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for hcc140a is CH3CCl3. The IUPAC name for hcc140a is 1,1,1-trichloro-ethane.' This appears to be the same chemical species so I don't think we need a new name for this one. We have ten existing hcc140a names and if it is also commonly referred to as methyl chloroform I suggest we add that to the definitions as follows: ' "Mole fraction" is used in the construction "mole_fraction_of_X_in_Y", where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for hcc140a, also called methyl chloroform, is CH3CCl3. The IUPAC name for hcc140a is 1,1,1-trichloro-ethane.' Do others agree? To summarize where we are with this set of proposals, the following are accepted for publication in the standard name table and will be included in this week's update: 'mole_fraction_of_dichloromethane_in_air (Canonical unit: 1) Definition: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for dichloromethane is CH2Cl2. The IUPAC name is dichloromethane.' mole_fraction_of_chloroform_in_air (Canonical unit: 1) Definition: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for chloroform is CHCl3. The IUPAC name for chloroform is trichloromethane.' mole_fraction_of_perchloroethene_in_air (Canonical unit: 1) Definition: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for perchloroethene is CCl2CCl2. The IUPAC name for perchloroethene is tetrachloroethene.' mole_fraction_of_pfc218_in_air (Canonical unit: 1) Definition: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for pfc218 is C3F8. The IUPAC name for pfc218 is octafluoropropane.' The definitions of all existing carbon_tetrachloride names will be updated to add the IUPAC name of tetrachloromethane. The following proposals for new names are rejected because they are duplicates of existing names: mole_fraction_of_carbon_tetrachloride_in_air; mole_fraction_of_methyl_chloroform_in_air (it is proposed to update the definitions of existing hcc140a names to list methyl chloroform as a commonly used name for the same species). Best wishes, Alison ----------------------------------------------------------------------------------------------------------- Alison Pamment Tel: +44 1235 778065 NCAS/Centre for Environmental Data Analysis Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. From: CF-metadata <[email protected]> On Behalf Of Lowry, Roy K. Sent: 02 April 2019 13:03 To: Dan Say <[email protected]>; [email protected] Subject: Re: [CF-metadata] New halocarbon standard name requests Hi again, This request for PFC-318 is duplicated in your third e-mail (the one including carbon tetrafluoride). Cheers, Roy. I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address. ________________________________________ From: Dan Say Sent: 29 March 2019 14:33 To: Lowry, Roy K.; mailto:[email protected] Subject: Re: New halocarbon standard name requests Apologies, can I also add the following: PFC-318 Standard name: mole_fraction_of_pfc318_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for pfc318 is c-C4F8. The IUPAC name for pfc318 is octafluorocyclobutane. Thanks, Dan ________________________________ Dr Daniel Say Postdoctoral Research Associate Atmospheric Chemistry Research Group School of Chemistry University of Bristol Tel: (+44) 117 3317042 ________________________________________ From: Lowry, Roy K. Sent: 29 March 2019 13:39:25 To: Dan Say; mailto:[email protected] Subject: Re: New halocarbon standard name requests Thanks Dan, Nicely put together and I can't see any issues. Cheers, Roy. I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address. ________________________________________ From: CF-metadata on behalf of Dan Say Sent: 29 March 2019 13:11 To: mailto:[email protected] Subject: [CF-metadata] New halocarbon standard name requests Dear All, I'd like to request an addition to the standard name list for atmospheric measurements of halocarbons dichloromethane, chloroform, perchloroethene, carbon tetrachloride, methyl chloroform and octafluoropropane. Here are the details of the proposed standard names. Proposal for a new standard variable names: Dichloromethane Standard name: mole_fraction_of_dichloromethane_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for dichloromethane is CH2Cl2. The IUPAC name is dichloromethane. Chloroform Standard name: mole_fraction_of_chloroform_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for chloroform is CHCl3. The IUPAC name for chloroform is trichloromethane. Perchloroethene Standard name: mole_fraction_of_perchloroethene_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for perchloroethene is CCl2CCl2. The IUPAC name for perchloroethene is tetrachloroethene. Carbon tetrachloride Standard name: mole_fraction_of_carbon_tetrachloride_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for carbon tetrachloride is CCl4. The IUPAC name for carbon tetrachloride is tetrachloromethane. Methyl chloroform Standard name: mole_fraction_of_methyl_chloroform_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for methyl chloroform is CH3CCl3. The IUPAC name for methyl chloroform is 1,1,1-trichloroethane. PFC-218 Standard name: mole_fraction_of_pfc218_in_air (Canonical unit: 1) Long name: 'Mole fraction is used in the construction mole_fraction_of_X_in_Y, where X is a material constituent of Y. A chemical or biological species denoted by X may be described by a single term such as "nitrogen" or a phrase such as "nox_expressed_as_nitrogen". The chemical formula for pfc218 is C3F8. The IUPAC name for pfc218 is octafluoropropane. Thanks in advance, Dan ________________________________ Dr Daniel Say Postdoctoral Research Associate Atmospheric Chemistry Research Group School of Chemistry University of Bristol Tel: (+44) 117 3317042 This email and any attachments are intended solely for the use of the named recipients. If you are not the intended recipient you must not use, disclose, copy or distribute this email or any of its attachments and should notify the sender immediately and delete this email from your system. UK Research and Innovation has taken every reasonable precaution to minimise risk of this email or any attachments containing viruses or malware but the recipient should carry out its own virus and malware checks before opening the attachments. UK Research and Innovation does not accept any liability for any losses or damages which the recipient may sustain due to presence of any viruses. 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