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Mobility of rare earth elements in the system soils–plants–groundwaters: a case study of an arid area (Oman)

حركة العناصر الأرضية النادرة في نظام التربة – النبات – الماء الجوفي : دراسةحالة من منطقة جافة (عُمان)

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Abstract

Groundwater samples from six wells and various species of plants from soils developed on ophiolites were collected from an arid area (AlKhod area, Oman) and analyzed for trace elements including rare earth elements (REEs). The distribution patterns of REEs in plants indicated an enrichment in middle REEs (MREEs = Sm to Dy) and heavy REEs (HREEs = Ho to Lu), when they are normalized to the REE composition of the Post Archean Australian Shale (PAAS), with a significant negative anomaly in Ce and a positive anomaly in Eu. Compared to Oman ophiolites, the REEs in different species of plants are depleted in Ce and enriched in MREEs and slightly enriched in light REE (LREE = from La to Nd). Relative to PAAS, the distribution of REEs in groundwaters revealed similar patterns to the REE distribution in plants. The distribution patterns of REEs in plants relative to those in waters are nearly flat. These patterns suggest that the transfer of REEs from soil solutions to the groundwaters in Oman occurs without any significant fractionation.

الملخص العربى:-

جُمعت عينات مياه جوفية ستة آبار بالإضافة إلى أنواع مختلفة من النباتات النامية على تربة تكونت على صخور الأوفيولايت، وذلك من منطقة جافة (منطقة الخود، عُمان)، وقد حللت للعناصر النزرة ومن ضمنها العناصر الأرضية النادرة. توضح أنماط توزيع العناصر الأرضية النادرة في النباتات إثراء في العناصر الأرضية الثقيلة (الهولميوم ولوتيتيوم) والمتوسطة (ساماريوم وديسبروزيوم) عندما يتم مقارنتها بترحيب العناصر الأرضية النادرة في الطفل الأسترالي لما بعد الآركي، بالإضافة إلى شذة سلبية واضحة للسيريوم وشذة ايجابية لليوربيوم. بالمقارنة مع أوفيولايت عُمان فإن العناصر الأرضية النادرة في أنواع مختلفة من النباتات تبدي نقصا في السيريوم وإثراء في العناصر الأرضية النادرة المتوسطة وإثراء يسيرا في العناصر الأرضية النادرة الخفيفة ( لانثانوم إلى نيوديميوم ).وبالمقارنة الطفل الاسترالي لما بعد الآركي فإن العناصر الأرضية النادرة في المياه الجوفية يظهر نمطا مماثلا لتوزيع تلك العناصر في النباتات، بحيث أن أنماط التوزيع للعناصر الأرضية النادرة في النباتات منسوبة إلى تلك الأنماط في المياه تكون مسطحة تقريبا. هذا يدل على أن انتقال هذه العناصر من محاليل التربة إلى المياه الجوفية في عُمان يحدث بدون تفاوت واضح.

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Acknowledgement

The authors would like to sincerely thank Annette Patzelt from botanic garden (Muscat, Oman) for her determination of plant taxonomy and the master students in the geology department (College of Science, SQU) for their contribution during the collection of groundwater samples. The authors would also like to thank Marc Steinmann from (Franche-Comté University, France) for his comments on the manuscript.

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Correspondence to Khadija Semhi.

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Semhi, K., Abdalla, O.A.E., Al Khirbash, S. et al. Mobility of rare earth elements in the system soils–plants–groundwaters: a case study of an arid area (Oman). Arab J Geosci 2, 143–150 (2009). https://doi.org/10.1007/s12517-008-0024-y

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  • DOI: https://doi.org/10.1007/s12517-008-0024-y

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