Fractionation and Risk Assessment of Rare Earth Elements in Drill Cuttings from Petroleum Wells in Ultra-Deep Waters.

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Bulletin of Environmental Contamination and Toxicology Pub Date : 2025-07-05 DOI:10.1007/s00128-025-04079-w

Klaiani Bez Fontana, Eduardo Sidinei Chaves, Rennan Geovanny Oliveira Araujo, Tatiane de Andrade Maranhão

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Abstract

The mobility and bioavailability of rare earth elements (REE) from anthropogenic activity has aroused environmental interest and concern. In this work, we evaluated the chemical fractionation of REE in drill cutting (DC) samples from oil wells in ultra-deep waters by the European Community Bureau of Reference (BCR) sequential extraction procedure. Sequential extraction in the DC samples showed that the concentration of REE in the fractions followed the order of residual > reducible > weak acid soluble > oxidant. The environmental risk, evaluated by the risk assessment code (RAC), potential ecological risk factor ([Formula: see text]) and potential ecological risk index (IR), indicated, in general, a low ecological risk associated with the REE in DC samples. Furthermore, the mineralogical composition analysis of DC, performed by X-ray powder diffraction (XRD), showed that sample composition is mainly of quartz and calcite, while analysis by X-ray fluorescence spectrometry (XRF) indicated that the perforated rocks are composed of aluminosilicate minerals with high levels of SiO₂ and Al₂O₃.

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超深水油井钻屑中稀土元素分馏及风险评价

人类活动中稀土元素的迁移性和生物利用度引起了人们对环境的关注。在这项工作中，我们利用欧洲共同体参考局（BCR）顺序萃取程序评估了超深水油井钻切（DC）样品中稀土元素的化学分馏。直流样品的顺序萃取表明，各馏分中稀土元素的浓度顺序为残余>可还原性>弱酸溶性>氧化剂。通过风险评估代码（RAC）、潜在生态风险因子（[公式：见文]）和潜在生态风险指数（IR）对环境风险进行评价，总体上表明DC样品中稀土元素的生态风险较低。x射线粉末衍射（XRD）分析表明，样品成分主要为石英和方解石，x射线荧光光谱（XRF）分析表明，孔洞岩石由高含量SiO2和Al2O3的铝硅酸盐矿物组成。

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来源期刊

Bulletin of Environmental Contamination and Toxicology 环境科学-毒理学

CiteScore

5.60

自引率

3.70%

发文量

230

审稿时长

1.7 months

期刊介绍： The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.