Studies of Bound Form on Rare Earths in a Natural Plant Fern Dicranopteris Dichotoma by Spectroscopy

Abstract

Abstract: Distribution of REand structure characterization of REchlorophyll in a natural plant fern Dicranopteris Dichotoma in rare earth mining area were studied by spectrocopy. The results showed that the cerium content in total rare earths(79.43%, 66.71%) was the highest in leaf and chlorophyll, respectively. The fluorescence emission peaks of photosystem Ⅱ in D. Dichotoma were more violet shift by 15～25 nm than that of common plant. The fluorescence intensity of photosystem Ⅱ was as 6.79 time as that of photosystem Ⅰ. It showed that REScan increase the activities of photosystem Ⅱ. The spectral characterization of UV Vis and FTIRon chlorophyll a in D. dichotoma are similar as standard chlorophyll a and couldn't suggest coordination information on REs for its very low contents of REchlorophyll in D. Dichotoma. Extended X-ray absorption fine structure(EXAFS) spectral analysis revealed that cerium coordinated two porphyrin rings with coordination number of eight, the bond length of Ce-Nwas 0.252 nm, respectively; Ce-chlorophyll a may have bilayer structure in D. Dichotoma.

Key words: Rare earth elements, Dicranopteris Dichotoma, Chlorophyll, EXAFS

CLC Number:

O614

TrendMD:

HONG Fa-Shui, WEI Zheng-Gui, ZHAO Gui-Wen . Studies of Bound Form on Rare Earths in a Natural Plant Fern Dicranopteris Dichotoma by Spectroscopy[J]. Chem. J. Chinese Universities, 2001, 22(11): 1790.

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Studies of Bound Form on Rare Earths in a Natural Plant Fern Dicranopteris Dichotoma by Spectroscopy

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