Impact of recent urbanization on formic and acetic acid concentrations in coastal North Carolina rainwater |
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| Institution: | 1. Centro de Química - Vila Real, Universidade de Trás-os-Montes e Alto Douro, 5001-801, Vila Real, Portugal;2. Université de Lille, CNRS UMR 8516 LASIR, 3, rue Pr. Laguesse, BP 83 - 59006, Lille Cedex, France;1. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Systems Analysis, Integrated Assessment and Modelling, 8600, Dübendorf, Switzerland;2. ETH Zurich, Department of Environmental Systems Science, 8092, Zurich, Switzerland;1. Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba. Ciudad Universitaria, 5000 Córdoba, Argentina;2. Fakultät für Mathematik und Naturwissenschaften, Physikalische & Theoretische Chemie, Bergishe Universitaet Wuppertal, Wuppertal, Germany;1. Institute of Food Safety, Chinese Academy of Inspection & Quarantine, Beijing 100176, China;2. School of Pharmacy, China Medical University, Shenyang 110013, China |
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| Abstract: | Concentrations of formic and acetic acids in Wilmington, North Carolina, USA, rainwater collected between 1996 and 1998 have increased dramatically since an earlier study conducted at the same site between 1987 and 1989. The current volume-weighted concentrations of acetic acid are within the range of values reported for urban locations whereas values from the earlier study at this site were similar to those obtained for rural locations. The ratios of formic to acetic acids (F : A) in the current study (approximately 1 : 1) are considerably lower than those previously reported (approximately 2.7 : 1). Current F : A's are similar to F : A's from direct automobile emissions. Increases in formic and acetic acid concentrations and the shift in formic to acetic acid ratios likely reflect the impact of extensive population growth in the surrounding region. Assuming increases in formic and acetic acid concentrations result from increased anthropogenic sources, we estimate at least 1/2 of the formic and at least 2/3 of the acetic acid in Wilmington, NC growing season rainwater results from anthropogenic sources. |
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