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Variation of the distribution coefficients of rare earth elements in modern coral-lattices: species and site dependencies |
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| Authors: | T Akagi Y Hashimoto H Tsuno Y Nakano |
| Institution: | 1 Faculty of Agriculture, Tokyo University of Agriculture and Technology, Saiwaicho, Fuchu, Tokyo 183-8509, Japan 2 Research Group for Analytical Chemistry, Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai-mura, Naka, Ibaraki 319-1195, Japan 3 Measurement Technology Group, Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan 4 Sesoko Station, Tropical Biosphere Research Center, University of Ryukyus, Sesoko 3422, Motobucho, Okinawa 905-0227, Japan |
| Abstract: | Rare earth element (REE) concentrations in the carbonate lattice of four species of coral have been analyzed and compared with the dissolved REE in ambient seawaters. The corals were from two areas of different salinity, marine (34-34.5) and bay (33-34). The measurement of REE in coral was carried out with inductively coupled plasma mass spectrometry (ICP-MS) after meticulous washing of coral samples, digestion with acetic acid and preconcentration of REE. The concentrations of REE in the two ambient seawaters were quite different, being ten-times higher in the bay area and enriched in light REE. However, the average distribution coefficients (D’s) were almost identical in the two areas. Substantial distribution coefficient differences were observed among the four coral species and the magnitude of inter-species variation in D was also species-dependent. Theoretical calculations imply that pH variation could cause variations in D large enough to account for the small differences between the two areas. |
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