Fractionation of chromium in coal gangue soil samples by time saving sequential extraction scheme from different coal mining fields

IF 1.827 Q2 Earth and Planetary Sciences

Arabian Journal of Geosciences Pub Date : 2026-08-04 DOI:10.1007/s12517-026-12572-7

Ayaz Ali Lashari, Tasneem Gul Kazi, Jameel Ahmed Baig, Hassan Imran Afridi, Muhmmad Fahad Khan

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Abstract

Coal gangue soil (CGS) samples include trace components, some of which are highly carcinogenic and may cause a danger to the environment. Additionally, they have the capacity to bioaccumulation, which poses a significant barrier to the beneficiation or safe disposal of coal by-products (CGS). It becomes crucial to understand the chromium (Cr) content in CGS samples in order to carry out thorough risk assessments for developing coal power plants. The aim of this work is to determine Cr content of different CGS samples by using a BCR sequential extraction scheme. A time-saving shaking device known as ultrasonic-assisted single-step extraction (UA-SSE), which uses the same experimental parameters and extracting solutions as the BCR sequential extraction scheme, was used to shorten the 51-hour length of the BCR sequential scheme for Cr associated with different chemical phases for CGS samples up to 2 h. The UA-SSE extraction method resulted in higher Cr contents in the acid-soluble fractions of CGS samples (> 1%) compared to BCR-SES values (p < 0.05). The obtained data showed that up to 30.8 to 31.2% of Cr was observed in the residual phase of CGS samples obtained from two coal mining regions (Thar coal field and Lakhra coal field), where as Cr contents were obtained in CGS samples up to 68.8 to 69.2% for all three extractable phases (F 1 + F 2 + 3).

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不同矿区煤矸石土样中铬的时序萃取分选

煤矸石土（CGS）样品中含有微量成分，其中一些具有高度致癌性，可能对环境造成危害。此外，它们具有生物积累能力，这对煤副产品（CGS）的选矿或安全处置构成了重大障碍。了解CGS样品中的铬含量，对发展中的燃煤电厂进行全面的风险评估至关重要。本工作的目的是利用BCR顺序萃取方案测定不同CGS样品的Cr含量。采用与BCR顺序提取方案相同的实验参数和提取溶液，采用超声辅助单步提取（UA-SSE）的省时震动装置。（p < 0.05），将CGS样品中与不同化学相相关的Cr的BCR顺序方案的51小时长度缩短至2小时。与BCR- ses相比，UA-SSE提取方法导致CGS样品中酸溶部分的Cr含量更高（> 1%）。结果表明，从两个采区（Thar煤田和Lakhra煤田）获得的CGS样品的残余相中，Cr含量高达30.8 ~ 31.2%，而在所有3个可萃取相（f1 + f2 + 3）中，CGS样品的Cr含量高达68.8 ~ 69.2%。

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来源期刊

Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-

自引率

0.00%

发文量

1587

审稿时长

6.7 months

期刊介绍： The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.