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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Carbon isotope ratios for chloromethane of biological origin: Potential tool in determining biological emissions

Harper, D.B. and Kalin, R.M. and Hamilton, John T.G. and Lamb, C. (2001) Carbon isotope ratios for chloromethane of biological origin: Potential tool in determining biological emissions. Environmental Science and Technology, 35 (18). pp. 3616-3619.

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Abstract

Chloromethane (CH3Cl) with a global atmospheric burden of 5.3 million t is the most abundant halocarbon in the atmosphere. However, the origin of ca. 50% of the estimated annual global input of 4 million t of the gas to the atmosphere has yet to be determined. As the oceanic contribution to the global CH3Cl flux is now tightly constrained, an important terrestrial source is either underestimated or unrecognized. It has recently been proposed that higher plants may represent a CH3Cl source of sufficient magnitude to resolve the global budget imbalance. A potentially useful tool in validating CH3Cl emission flux estimates is comparison of the carbon isotope ratio of atmospheric CH3Cl with those of CH3Cl originating from various sources. Here we report the first measurements of delta C-13 for CH3Cl produced biologically. The CH3Cl released by the higher plant species Batis maritima and Solanum tuberosum was dramatically depleted in C-13 with respect to plant tissue (Delta C-13 = -36.8 parts per thousand and -34.5 parts per thousand, respectively); CH3Cl released by the fungus Phellinus pomaceus also showed significant C-13 depletion with respect to the wood growth substrate (Delta C-13 = -17.9 parts per thousand). When reliable delta C-13 values for the other major sources of atmospheric CH3Cl become available, the distinctive isotopic signature of plant-derived CH3Cl should help constrain the contribution to the atmospheric burden from this source.