Distribution patterns of rare-earth elements and uranium in tertiary sedimentary phosphorites of Hahotoé–Kpogamé, Togo

Gnandi, Kissao; Tobschall, H. J.

doi:10.1016/j.jafrearsci.2003.08.002

Cited by 42 publications

(22 citation statements)

References 17 publications

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“…The diffractogram, presented in Fig. 2 [17], [18]. It appears that the recorded dolomite, calcite and quartz phases due to their nature exogangue, while the interference of these phases with fluorapatite are due to their natural endogangue.…”

Section: Xrd Analysis and Phases Identificationmentioning

confidence: 92%

Qualitative and quantitative analysis of phosphate rock from Hazm Al-jalamid area, northern Saudi Arabia

Aissa

Abdeen

Abualreish

2014

International Journal of Basic and Applied Sciences

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Four samples of phosphate rock were collected from Hazm Al-Jalamid region (North of Saudi Arabia). These samples were treated and characterized using X-ray diffraction pattern XRF analysis, thermal analysis (DSC-TG), IR spectroscopy, scanning electronic microscope (SEM), and elemental analysis (ICP-OES). Crystallographic analysis showed that phosphate rock of this region consist of four principle inorganic phases with concentration varies from sample to another. In addition to calcium, elemental analysis verified the presence of other metals such as Fe, Al, Cd, Si and Mg. Infrared spectroscopy of the phosphate rocks reveals the presence of vibration bands characteristic of identified phases. The results of thermal analysis, essentially the mass loss were related to the variation of calcite and dolomite concentration in the phosphate rock.

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Section: Xrd Analysis and Phases Identificationmentioning

confidence: 92%

Qualitative and quantitative analysis of phosphate rock from Hazm Al-jalamid area, northern Saudi Arabia

Aissa

Abdeen

Abualreish

2014

International Journal of Basic and Applied Sciences

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“…It is known that mineral weathering is an important source of elements to the soils [43]. However, even after weathering of primary minerals, REE can still, partially or totally, be again incorporated in secondary minerals, remaining immobilized [44].…”

Section: Sources and Fate Of Ree In Soilsmentioning

confidence: 99%

Rare Earth Elements in the Soil Environment

et al. 2016

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Rare earth elements (REE) are a homogenous group of 17 chemical elements in the periodic table that are key to many modern industries including chemicals, consumer electronics, clean energy, transportation, health care, aviation, and defense. Moreover, in recent years, they have been used in agriculture. One of the consequences of their worldwide use is the possible increase of their levels in various environmental compartments. This review addresses major topics concerning the study of REE in the soil environment, with special attention to the latest research findings. The main sources of REE to soils, the contents of REE in soils worldwide, and relevant information on the effects of REE to plants were explored. Ecological and human health risk issues related to the presence of REE in soils were also discussed. Although several findings reported positive effects of REE on plant growth, many questions about their biological role remain unanswered. Therefore, studies concerning the actual mechanism of action of these elements on cellular and physiological processes should be further refined. Even more urgent is to unveil their chemical behavior in soils and the ecological and human health risks that might be associated with the widespread use of REE in our modern society.

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“…Once released from primary minerals, REEs are either lost from the weathering profile via the soil solution or incorporated, partially or totally, into secondary minerals that may be subsequently weathered (Öhlander et al, 1996;Panahi et al, 2000;Taunton et al, 2000;Gnandi and Tobschall, 2003). The REE redistribution during weathering is a function of:…”

Section: Impact Of Weathering On Ree Mobilizationmentioning

confidence: 99%

A review on the potentiality of Rare Earth Elements to trace pedogenetic processes

2009

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Distribution patterns of rare-earth elements and uranium in tertiary sedimentary phosphorites of Hahotoé–Kpogamé, Togo

Cited by 42 publications

References 17 publications

Qualitative and quantitative analysis of phosphate rock from Hazm Al-jalamid area, northern Saudi Arabia

Qualitative and quantitative analysis of phosphate rock from Hazm Al-jalamid area, northern Saudi Arabia

Rare Earth Elements in the Soil Environment

A review on the potentiality of Rare Earth Elements to trace pedogenetic processes

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