Natural and anthropogenic sources of copper to organic soils: a global, geochemical perspective

• Main Author: Shotyk, William
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: NRC Research Press (a division of Canadian Science Publishing) 2020
• Subjects: Greenland; New Zealand; Antarc*; Antarctica
• Online Access: http://hdl.handle.net/1807/102378; http://www.nrcresearchpress.com/doi/abs/10.1139/CJSS-2019-0161

Copper (Cu) is essential for all organisms but is commonly deficient in organic soils or found locally in excess. Natural and anthropogenic inputs of Cu were examined using 32 peat cores from bogs in Europe, North America, New Zealand, Greenland, and Antarctica. The natural abundance of Cu in ombrotrophic (rainwater-fed) peat was studied using (1) samples from pre-industrial periods (representing background values), (2) bromine (Br) concentrations and the background Cu/Br ratio, and (3) cores from remote locations. Etang de la Gruère in Switzerland provides a record of 15 000 yr of peat accumulation. The lowest Cu concentrations (1.0 ± 0.20 mg·kg−1) are found in 18 peat layers dating from ca. 6000 to 9000 cal yr BP, when atmospheric deposition of soil-derived dust was at a minimum. Similar background values occur in peat bogs from other regions. Recent peat layers from bogs in developed areas reveal much greater concentrations. Using the Cu/Br ratio, “excess” Cu in peat profiles can be calculated and attributed either to anthropogenic inputs in recent peats or natural inputs from mineral–water interactions in deeper layers. Peat cores from remote regions of northern Alberta show little or no evidence of anthropogenic Cu. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author.