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<p>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&#xa0;h. The UA-SSE extraction method resulted in higher Cr contents in the acid-soluble fractions of CGS samples (&gt; 1%) compared to BCR-SES values (<i>p</i> &lt; 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).</p>

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

  • 期刊论文

  • 发表日期：

    2026年8月4日

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

摘要

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).