Absence of Ce anomaly in the REE patterns of peat moss and peat grass in the Ozegahara peatland.

Akagi, Tetsuya; Fu, FengFu; Yabuki, Sadayo

doi:10.2343/geochemj.36.113

Cited by 24 publications

(25 citation statements)

References 16 publications

(17 reference statements)

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“…Thus, the relative abundance of REEs in terrestrial soil-grown plants, peat vegetation, and algae are distinct from each other. According to our survey, soil-grown plants and algae showed Ce anomalies in their REE patterns, whereas peat vegetation showed no Ce anomaly (Akagi et al, 2002;Fu et al, 1998Fu et al, , 2000Fu et al, , 2001. There is a good theoretical reason for the absence of a Ce anomaly in peat vegetation: the water in peatland soil has too low a pH value and redox potential to oxidize Ce 3+ to Ce 4+ (Akagi et al, 2002).…”

Section: Implications Regarding the Original Plants That Produced Thementioning

confidence: 99%

“…REEs in plants, with the exception of Ce, behave coherently during incorporation into the plant from the environment (Fu et al, 2001). Thus, the relative abundances of REEs in the environment are more or less preserved in plants (Akagi et al, 2002;Fu et al, 1998Fu et al, , 2000Fu et al, , 2001Wyttenbach et al, 1998).…”

Section: Separation Of Rees Into Acetic Acid Soluble and Acetic Acid mentioning

confidence: 99%

“…Water contributes an insignificant concentration of REEs in coals compared with the first two sources, both because groundwater or river water contain only trace levels of REEs (i.e., a few parts per trillion), and because water is squeezed out of coal during the coalification process. The percentage of REEs inherited from the original plants depends on the nature of the original plants that formed the coals, and so can vary greatly, since different species of plants contain different levels of REEs (Fu et al, 2000(Fu et al, , 2001Akagi et al, 2002).…”

Section: Separation Of Rees Into Acetic Acid Soluble and Acetic Acid mentioning

confidence: 99%

“…In our earlier studies, we have reported that soil-grown plants exhibit a common REE pattern that is different from that of peat vegetation or algae (Akagi et al, 2002;Fu et al, 1998Fu et al, , 2000Fu et al, , 2001. This pattern reflected the REE pattern of the silicate minerals in the surrounding soil,…”

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confidence: 99%

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Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Akagi

Suzuki

et al. 2004

Geochem. J.

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The precise concentrations of rare earth elements (REEs) in Japanese Ashibetsu and Taiheiyo coals, in Indonesian Ambalut coal, and in Australian boghead coal have been determined, in order to compare the REE contents of the coals with those of plants and also to obtain further knowledge of the original plants from which these coals were formed. By leaching the coals after ashing using a 10% acetic acid solution, each coal sample was separated into two fractions: an acetic acid soluble fraction, and an acetic acid insoluble fraction. Our results show that three different types of chondritenormalized REE patterns are observed in the acetic acid soluble fraction of these coals. The acetic acid soluble fractions of the Ashibetsu, the Taiheiyo, and some of the Ambalut coals showed REE patterns identical to those of peat vegetation. Those of other Ambalut coals showed an REE pattern that was similar to that of tree trunks. The boghead coal showed a different REE pattern that was similar to algae, an origin that is also suggested from a maceral study. The REE patterns of the acetic acid soluble fraction can therefore be a useful proxy for determining the original plants that formed the coals.

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Section: Implications Regarding the Original Plants That Produced Thementioning

confidence: 99%

Section: Separation Of Rees Into Acetic Acid Soluble and Acetic Acid mentioning

confidence: 99%

Section: Separation Of Rees Into Acetic Acid Soluble and Acetic Acid mentioning

confidence: 99%

mentioning

confidence: 99%

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Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Akagi

Suzuki

et al. 2004

Geochem. J.

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“…Freeman et al (2001) reported the involvement of phenolic compounds promoting the decay of peat, which was activated by the presence of oxygen. The whole of the Ozegahara peatland is a reducing environment, buffered with the Fe 2+ -FeOOH system (Akagi et al, 2002). The inactivation and/or lack of such molecules in reducing conditions might be the reason for good preservation of "lignin" in the Ozegahara peatland.…”

Section: Decay Of Holocellulosementioning

confidence: 99%

Variation in carbon isotopes of bog peat in the Ozegahara peatland, Japan

et al. 2004

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The carbon isotope ratios of bog peat in the Ozegahara peatland, Japan, were measured. The vertical variation of the bulk peat featured: 1) rapid decrease of the carbon isotope ratio (δ 13 C) near the surface, 2) broad rises in the ratio around depths corresponding to 3000, 5500, 7500 years BP with a period of approximately 2500 years, and 3) a further decrease toward the bottom. In order to understand the reasons for the changes, peat components were separated and their isotopic composition measured along with modern peat-forming vegetation. The selective decay of holocellulose is responsible for the rapid decrease of δ 13 C in the surface layers, and the transition from earlier vegetation caused the further decrease of δ 13 C near the bottom. The decay constant for holocellulose was estimated to be as small as 0.001 yr -1 . The variation of δ 13 C seemed to be synchronized with sea level change, but showed poor correlation with solar activity and the temperature change estimated from pollen analysis. The δ 13 C of peat mosses lacking in stomata would increase with the rise in atmospheric CO 2 . The increase in the atmospheric CO 2 occurring synchronously with sea level rise could be the reason for the periodical change. Some climatic information of the Holocene period may have been recorded in the Ozegahara bog peat.

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Biogeochemical Factors Affecting Rare Earth Element Distribution in Shallow Wetland Groundwater

et al. 2014

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Wetlands are specific areas able to regulate metals mobility in the environment. Among metals, rare earth elements (REE) appear to be particularly interesting because of the information that could be provided by the REE patterns. Moreover, as REE are becoming a matter of great economic interest, their significant release into the environment may be expected over the next few decades. Wetlands would then play a key role in the regulation of their concentration in the environment. This review demonstrated that REE are released in wetland bound to colloidal organic matter. During the flood season, the released REE concentrations are largely higher than those released during the wet period. This solubilization is related to the organic matter desorption caused by the pH rise imposed by the reducing reactions. The resulting REE patterns depend on the heterogeneity of the humic acid (HA) binding sites and the presence of potential competitive cations, such as Fe(III) and Al(III). At high REE loading, REE are bound to HA carboxylic groups and the pattern exhibit a MREE downward concavity. At low loading, REE are bound to phenolic and chelate groups and the pattern exhibits a lanthanide contraction. At low loading, REE seem to act as cationic bridges between two organic molecules, whereas at high loading they seem to be engaged in strong multidentate bonding. Moreover, the REE patterns can be modified with the competitive cations amount and speciation. The prime factor governing all these processes is pH, which drives the organic colloid production, REE loading and solubility of competitive cations.

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Absence of Ce anomaly in the REE patterns of peat moss and peat grass in the Ozegahara peatland.

Cited by 24 publications

References 16 publications

Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Variation in carbon isotopes of bog peat in the Ozegahara peatland, Japan

Biogeochemical Factors Affecting Rare Earth Element Distribution in Shallow Wetland Groundwater

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