Chemicals that eased one environmental problem may worsen another

Chemicals that eased one environmental problem may worsen another
Forests are being damaged by acid rain, which contains a corrosive ingredient that may result from the breakdown of chemicals introduced to help protect Earth's ozone layer. Credit: Wikimedia Commons

Chemicals that helped solve a global environmental crisis in the 1990s — the hole in Earth's protective ozone layer — may be making another problem — acid rain — worse, scientists are reporting. Their study on the chemicals that replaced the ozone-destroying chlorofluorocarbons (CFCs) once used in aerosol spray cans, air conditioners, refrigerators, and other products, appears in ACS' Journal of Physical Chemistry A.

Jeffrey Gaffney, Carrie J. Christiansen, Shakeel S. Dalal, Alexander M. Mebel and Joseph S. Francisco point out that hydrochlorofluorocarbons (HCFCs) emerged as CFC replacements because they do not damage the ozone layer. However, studies later suggested the need for a replacement for the replacements, showing that HCFCs act like super greenhouse gases, 4,500 times more potent than carbon dioxide. The new study adds to those concerns, raising the possibility that HCFCs may break down in the atmosphere to form oxalic acid, one of the culprits in .

They used a to show how HCFCs could form oxalic acid via a series of high in the atmosphere. The model, they suggest, could have broader uses in helping to determine whether replacements for the replacements are as eco-friendly as they appear before manufacturers spend billions of dollars in marketing them.

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More information: "Hydroxyl Radical Substitution in Halogenated Carbonyls: Oxalic Acid Formation", Journal of Physical Chemistry A.
Citation: Chemicals that eased one environmental problem may worsen another (2010, March 3) retrieved 26 November 2021 from
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