Sutherland Ross A, Tack Filip M G
Geomorphology Laboratory, Department of Geography, University of Hawaii, 2424 Maile Way, Honolulu, HI 96822, USA.
Environ Monit Assess. 2008 Mar;138(1-3):119-30. doi: 10.1007/s10661-007-9748-5. Epub 2007 May 23.
Extraction of labile metals from solid media is environmentally more meaningful than a total digestion. A variety of reagents have been introduced in the literature, but dilute HCl has received the greatest attention. We compare metal concentrations liberated by a dilute HCl leach with the sum of the 3-step optimized (standardized) BCR sequential extraction procedure. This is the first study to compare these procedures over a range of grain sizes. Road-deposited sediments from 10 sites in Honolulu were fractionated into six grain size classes. Aliquots of individual fractions were digested with dilute HCl, the 3-step BCR procedure ('labile'), and a 4-acid (total) procedure. Results indicated that the weighted labile concentrations of Al, Cu, Fe, Mn, Ni, Pb and Zn were statistically greater than those from the dilute HCl leach. However, regression analysis indicated strong statistically significant relationships between the two partial extraction procedures for all metals. On a whole-sample basis, the toxicity classifications for anthropogenic-enhanced metals (Cu, Pb and Zn) were similar between extractions. Taken together, results suggest that the application of dilute HCl to solid media provides a rapid, cost-effective, and environmentally meaningful approach for contaminant monitoring.
从固体介质中提取不稳定金属在环境方面比完全消解更具意义。文献中已介绍了多种试剂，但稀盐酸受到的关注最多。我们将稀盐酸浸出释放的金属浓度与三步优化（标准化）的BCR连续提取程序的总和进行比较。这是第一项在一系列粒度范围内比较这些程序的研究。来自檀香山10个地点的道路沉积物被分成六个粒度等级。各部分的等分试样用稀盐酸、三步BCR程序（“不稳定”）和四酸（总量）程序进行消解。结果表明，铝、铜、铁、锰、镍、铅和锌的加权不稳定浓度在统计学上高于稀盐酸浸出的浓度。然而，回归分析表明，两种部分提取程序对所有金属都有很强的统计学显著关系。在全样本基础上，两种提取方法对人为增强金属（铜、铅和锌）的毒性分类相似。综合来看，结果表明，将稀盐酸应用于固体介质为污染物监测提供了一种快速、经济高效且对环境有意义的方法。
