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Sodium and potassium in the bones of penguin and skua revealed by EPR and SR-XRF technique

Chinese Journal of Polar Science 2010年第1期21卷 22-30页

作者：谢周清徐思琦黄宇营何伟金嗣昭孙立广 Institute of Polar Environment School of Earth and Space SciencesUniversity of Science and Technology of China Institute of High Energy Physics Chinese Academy of Sciences Structure Research Laboratory University of Science and Technology of China

penguin and skua in the maritime Antarctic have high salt loadings in the body due to almost exclusive diet consumption of marine ***,the storage and turnover of sodium and potassium in these animals are poorly *** we determined the concentration and microscopic distribution of the two elements in the bones of penguin and *** average concentrations of sodium and potassium in penguin bone were comparable with that in skua bone（0.18% and 0.82% for penguin bone;0.19% and 0.76% for skua bone in dry weight）.The ratios of sodium to calcium and potassium to calcium（0.0330 and 0.0075 for penguin,0.0335 and 0.0082 for skua in average by weight） were somewhat higher than the reported ratios for terrestrial animals,indicating these marine animals＇ bone enrichment of *** ratios of sodium to potassium in average by weight were 6.75 and 4.65 for penguin and skua,*** value is much lower compared with the bulk sea water ratio of about 27.0,implying that potassium is favorable to reside in the bone rather than *** sodium and potassium were found to significant correlation with the content of organic materials in bone based upon the intensity of native signal determined by electron paramagnetic resonance（EPR）.It was estimated that almost all of potassium is kept within the organic phases,while about 30% of sodium is stored in organic phases and the other 70% within mineral *** microscopic distributions of potassium in the cross-section and/or surface were revealed by synchrotron radiation Xray fluorescence（SR-XRF） *** ratio of potassium to calcium based upon the SR-XRF intensity counter varied considerably from the surface to the interior,and on the surface the highest concentration of potassium was observed in the middle section with decreasing amounts toward the *** indirectly documented that exchange of potassium between fluid and bone organic phase maybe occur.

关键词： bone penguin and skua sodium and potassium electron paramagnetic resonance(EPR) synchrotron radiation X-ray fluorescence(SR-XRF).

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