The toxic metals in coal have different modes of occurrence required their frequent assessment by accurate and time‐saving chemical fractionation schemes. In the current study, the conventional sequential extraction BCR (SE‐BCR) method applied to recognize the chemical fraction of lead (Pb) in coal samples of recently developed Thar coalfield. The SE‐BCR scheme modified with a time‐saving single‐step extraction (SSE) method assisted with ultrasound energy and conventional shaking devices under the same operating conditions applied for the original SE‐BCR scheme. The conventional single‐step extraction (CSS) and ultrasonic‐assisted extractions (USE) methods efficiently reduced the time expected to separate all fractions by the SE‐BCR method in 51 h to 22 and 2 h, respectively. The validity of both single‐step extraction (SSE and USE) and SE‐BCR methods were confirmed by applying certified reference material (CRM) of sediment (BCR‐701) followed by the standard addition method. The Pb observed to be highest in the organic fraction (28.9–35.2%) and lowest in the acid‐soluble fractions (1.39–2.61%) of coal samples at both blocks (X and XI) of Thar coalfield.

中文翻译：

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基于BCR顺序提取方案的省时单步分离巴基斯坦塔尔煤田褐煤样品中的铅

煤中有毒金属的发生方式不同，需要通过准确，省时的化学分馏方案对其进行频繁评估。在当前的研究中，传统的顺序萃取BCR（SE-BCR）方法用于识别最近开发的塔尔煤田煤样品中铅的化学成分（Pb）。SE-BCR方案采用省时的单步提取（SSE）方法进行了修改，并在与原始SE-BCR方案相同的操作条件下，借助超声能量和常规振动装置进行了改进。常规的单步萃取（CSS）和超声辅助萃取（USE）方法有效地缩短了SE-BCR方法分离所有馏分所需的时间，分别为51 h至22 h和2 h。单步提取（SSE和USE）和SE-BCR方法的有效性都通过应用沉积物的认证参考物质（CRM）（BCR-701）以及标准添加方法来证实。在塔尔煤田的两个区块（X和XI），煤样中的Pb含量最高（28.9–35.2％），而酸溶级含量最低（1.39–2.61％）。