...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Selenium and sulphur in Athabasca bituminous sands mineral and bitumen fractions
【24h】

Selenium and sulphur in Athabasca bituminous sands mineral and bitumen fractions

机译：阿萨巴斯卡沥青砂矿物和沥青馏分中的硒和硫

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

There is increasing environmental concern regarding the emission of selenium (Se) from mining and upgrading of bitumen extracted from the Athabasca bituminous sands (ABS) in northern Alberta, Canada. However, there remains a lack of high quality analytical data for Se in this massive hydrocarbon reserve. Accurate analytical determinations of Se in bitumen from ABS are an important first step toward understanding its potential to be emitted to the environment. This has been a challenge due to the low abundance of Se combined with the preponderance of entrained mineral material (sand, clay) and the generally inadequate sensitivity of analytical methods used in the past. To overcome these issues, samples of ABS ores (McMurray Formation) underwent a toluene extraction procedure under ultra-clean lab conditions to separate bitumen from mineral particles. Separated bitumen, residual mineral material, and bulk ores were then subjected to acid-digestion and analysis using inductively coupled plasma sector-field mass spectrometry (ICP-SFMS) as well as hydride generation atomic fluorescence spectroscopy (HG-AFS). Unlike many other potentially toxic trace elements (Ag, As, Be, Cd, Cu, Pb, Sb, Tl and Zn) which exist almost exclusively in the mineral fraction, Se was found primarily (ca. 80%) in the organic (bitumen) fraction. Sulphur was determined in the same acid digests using both ICP-SFMS and inductively coupled plasma-optical emission spectroscopy (ICP-OES) and it too, was found almost exclusively in the bitumen fraction. Despite the limited number of samples available to our study, the positive, linear correlation between Se and S concentrations in bitumen suggests that S concentrations can be used as a guide to estimate their Se content. Given that Se is found mainly in the organic fraction of the ABS, there is considerable potential for mobilization of this element during upgrading and refining. The analytical methods successfully employed here have sufficient sensitivity to support studies of Se contamination of environmental media in the ABS region.
机译：从加拿大艾伯塔省北部的Athabasca沥青砂（ABS）提取的沥青的开采和提炼产生的硒（Se）排放引起了越来越多的环境关注。但是，在这一庞大的碳氢化合物储量中，仍缺乏有关硒的高质量分析数据。对ABS中沥青中的硒进行准确的分析测定是迈向了解其向环境排放潜能的重要第一步。由于硒的丰度低，加上夹带的矿物材料（砂，粘土）占优势，并且过去使用的分析方法通常灵敏度不足，因此这一直是一个挑战。为了克服这些问题，ABS矿石（McMurray地层）的样品在超净实验室条件下进行了甲苯萃取程序，以将沥青与矿物颗粒分离。然后，使用感应耦合等离子体扇区质谱（ICP-SFMS）和氢化物发生原子荧光光谱（HG-AFS）对分离出的沥青，残留矿物材料和大块矿石进行酸消化和分析。与几乎仅存在于矿物部分中的许多其他潜在有毒微量元素（Ag，As，Be，Cd，Cu，Pb，Sb，Tl和Zn）不同，Se主要在有机物（沥青中）中发现（约80％）。 ） 分数。使用ICP-SFMS和电感耦合等离子体发射光谱法（ICP-OES）在相同的酸消化液中测定硫，而且几乎仅在沥青馏分中发现了硫。尽管可用于我们的研究的样品数量有限，但沥青中Se和S浓度之间的正线性相关表明，S浓度可以用作估算其Se含量的指南。鉴于硒主要存在于ABS的有机部分中，因此在提纯和精制过程中有很大的动员这种元素的潜力。在此成功采用的分析方法具有足够的敏感性，可支持对ABS地区环境介质中Se污染的研究。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号