Matús Peter, Kubová Jana, Bujdos Marek, Stresko Vladimír, Medved Ján
Faculty of Natural Sciences, Geological Institute, Comenius University in Bratislava, Mlynská dolina, 84215 Bratislava, Slovakia.
Anal Bioanal Chem. 2004 May;379(1):96-103. doi: 10.1007/s00216-004-2562-9. Epub 2004 Mar 13.
The work presented describes the application of different analytical approaches for study of aluminium mobility in rock, soil, and sediment samples affected by mining activity (secondary quartzites with sulfidic deposits). For this purpose we used a combination of the single extractions, the optimized BCR three-step sequential extraction procedure (SEP), and reactive aluminium determination after chelating ion-exchange on Ostsorb (Iontosorb) Salicyl by a batch technique with flame atomic absorption spectrometry quantification. The single extraction agents H(2)O, KCl, NH(4)Cl, and BaCl(2) were found to be the best for the quantitative estimation of the aluminium mobility in rocks, soils, and sediments caused by acidification of the environment. This fact was confirmed by reactive aluminium determination in the same samples. The vast majority of the aluminium content of samples after application of the optimized BCR three-step SEP is in the residues. The available fraction of aluminium extracted by dilute CH(3)COOH in the first step of this procedure correlates with the reactive aluminium content. The amounts of aluminium released in the second and the third steps and the sums from steps 1-3 of this procedure are closely associated with the aluminium content values obtained by the single dilute HCl leach. The accuracy of results obtained was verified with only informative values for individual fractions of the BCR three-step SEP because of the absence of suitable certified or standard reference materials. The amounts of the reactive aluminium determined in samples was in the range 12-82% of total soluble Al in the filtered H(2)O extracts. It was confirmed that the acidified polluted samples contain the most of reactive Al content, which is responsible for its toxicity.
本文介绍了不同分析方法在受采矿活动影响的岩石、土壤和沉积物样本（含硫化物矿床的次生石英岩）中铝迁移性研究中的应用。为此，我们采用了单次萃取、优化后的BCR三步连续萃取程序（SEP）以及通过Ostsorb（Iontosorb）水杨酸盐上的螯合离子交换后采用批量技术结合火焰原子吸收光谱法定量测定活性铝的组合方法。发现单次萃取剂H₂O、KCl、NH₄Cl和BaCl₂最适合定量评估环境酸化导致的岩石、土壤和沉积物中铝的迁移性。在相同样本中测定活性铝证实了这一事实。应用优化后的BCR三步SEP后，样本中绝大多数铝含量存在于残渣中。该程序第一步中用稀CH₃COOH萃取的铝的可利用部分与活性铝含量相关。该程序第二步和第三步释放的铝量以及步骤1 - 3的总量与单次稀HCl浸出获得的铝含量值密切相关。由于缺乏合适的有证或标准参考物质，仅用BCR三步SEP各部分的信息值验证了所得结果的准确性。样本中测定的活性铝量占过滤后的H₂O提取物中总可溶性铝的12 - 82%。证实酸化污染样本中活性铝含量最高，这是其毒性的原因。
