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首页> 外文期刊>Quimica nova >Iron oxides and monazite from sands of two beaches in Espirito Santo, Brazil
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Iron oxides and monazite from sands of two beaches in Espirito Santo, Brazil

机译：巴西圣埃斯皮里图州两个海滩的沙子中的铁氧化物和独居石

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Sand samples collected from two sampling sites on Guarapari and Iriri beaches, state of Espírito Santo, Brazil, were studied in an attempt to better describe their chemical and mineralogical compositions and radioactive behaviors. The sands were found to contain about 6 (Guarapari) and 2 dag kg-1 (Iriri) of rare earth and thorium that, if allocated to the monazite-(Ce) structure, lead to the averaged formulae Ce3+0,494Gd3+0,012La3+0,209Nd3+0,177Pr3+0,040Sm3+0,024Th4+0,033 (PO4) and Ce3+0,474La3+0,227Nd3+0,190Pr3+0,044Sm3+0,032Th4+0,024 (PO4). From Mössbauer spectroscopy data, the magnetic fractions of these sands were found to contain stoichiometric hematite (47.4 dag kg-1, from Guarapari, and 25.1 dag kg-1, from Iriri) and magnetite (44.1 and 58.8 dag kg-1). The specific a and b radiation activities were also measured for both samples.
机译：为了更好地描述其化学和矿物组成以及放射性行为，对从巴西圣埃斯皮里图州瓜拉帕里和伊里里海滩的两个采样点采集的砂样进行了研究。发现这些沙子包含约6（瓜拉帕里）和2 dag kg-1（Iriri）的稀土和or，如果分配给独居石-（Ce）结构，则得出的平均公式为Ce3 + 0,494Gd3 + 0,012La3 + 0,209Nd3 + 0,177Pr3 + 0,040Sm3 + 0,024Th4 + 0.033（PO4）和Ce3 + 0,474La3 + 0,227Nd3 + 0,190Pr3 + 0,044Sm3 + 0,032Th4 + 0.024（PO4）。根据Mössbauer光谱数据，发现这些砂的磁性级分含有化学计量的赤铁矿（来自Guarapari的47.4达格kg-1和来自Iriri的25.1 dag kg-1）和磁铁矿（44.1和58.8 dag kg-1）。还测量了两个样品的比辐射a和辐射比b。

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