Abstract:The FTIR spectra of aragonites in outer and inner layers of thirteen species of mollusk shells were systematically measured, and the frequency variations of ν1,ν2 and ν4 bands of the aragonites with the positions of shell layers were analyzed. The results showed that the frequency of ν2 band differed in different species of shells and the positions of shell layers, but the frequencies of the other two bands were not altered, and had the same values with synthetic aragonites. In the same species of shells, the frequency of ν2 band in inner layers was greater than that in outer layers, and the frequency shift of ν2 band between inner and outer layers was in the range of 0.5-4.5 cm-1 in all studied samples. The detection of frequency shift of ν2 band in different layers of aragonitic mollusk shell was first reported in this paper.
[1] DAI Yong-ding, et al(戴永定, 等). Biomineralogy(生物矿物学). Beijing: Petroleum Industry Press(北京:石油工业出版社), 1994. 216. [2] Alder H H, Kerr P F. American Mineralogist, 1965, 47: 700. [3] TAO Jing, XU Yi-zhuang, WENG Shi-fu, WU Jin-guang, XU Duan-fu(陶 靖, 徐怡庄, 翁诗甫, 吴瑾光, 徐端夫). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 1998, 18(3): 307. [4] Andersen F A, Breevic' L. Acta Chemica Scandinavica, 1991, 45: 1018. [5] Sterzel W, Chorinsky E. Spectrochimica Acta, A,1968, 24: 353. [6] Alia J M, Mera Y D D, Edwards H G M, et al. Spectrochimica Acta, A,1997, 53: 2347. [7] Dauphin Y. Applied Spectroscopy, 1997, 51(2): 253.