Time Trial 1 M HCl extraction data for the Windmill Islands marine sediments

These results are for the time trial extraction of HCl.See also the metadata records for the 0.5 and 4 hour extractions of HCl.A regional survey of potential contaminants in marine or estuarine sediments is often one of the first steps in a post-disturbance environmental impact assessment. Of the many different chemical extraction or digestion procedures that have been proposed to quantify metal contamination, partial acid extractions are probably the best overall compromise between selectivity, sensitivity, precision, cost and expediency. The extent to which measured metal concentrations relate to the anthropogenic fraction that is bioavailable is contentious, but is one of the desired outcomes of an assessment or prediction of biological impact. As part of a regional survey of metal contamination associated with Australia's past waste management activities in Antarctica, we wanted to identify an acid type and extraction protocol that would allow a reasonable definition of the anthropogenic bioavailable fraction for a large number of samples. From a kinetic study of the 1 M HCl extraction of two certified Certified Reference Materials (MESS-2 and PACS-2) and two Antarctic marine sediments, we concluded that a 4 hour extraction time allows the equilibrium dissolution of relatively labile metal contaminants, but does not favour the extraction of natural geogenic metals. In a regional survey of 88 marine samples from the Casey Station area of East Antarctica, the 4 h extraction procedure correlated best with biological data, and most clearly identified those sediments thought to be contaminated by runoff from abandoned waste disposal sites. Most importantly the 4 hour extraction provided better definition of the low to moderately contaminated locations by picking up small differences in anthropogenic metal concentrations. For the purposes of inter-regional comparison, we recommend a 4 hour 1 M HCl acid extraction as a standard method for assessing metal contamination in Antarctica.The fields in this dataset areConcentrationExtraction TimeAntimonyArsenicCadmiumChromiumCopperIronLeadManganeseNickelSilverTinZinc

本结果针对氯化氢（HCl）的时间梯度萃取实验。亦可参考氯化氢0.5小时与4小时萃取的元数据记录。
对海洋或河口沉积物中的潜在污染物开展区域调查，通常是扰动后环境影响评价的首要步骤之一。在众多用于量化金属污染的化学萃取或消解方法中，部分酸萃取法或许是兼顾选择性、灵敏度、精密度、成本与便捷性的最优整体方案。
测得的金属浓度与生物可利用的人为源组分之间的关联程度尚存争议，但这正是生物影响评价或预测的核心目标之一。作为针对澳大利亚既往在南极洲开展的废物管理活动相关金属污染的区域调查的一部分，本研究旨在确定一种酸类与萃取方案，以实现对大量样品中人为源生物可利用组分的合理界定。
通过对两种有证标准参考物质（MESS-2与PACS-2）以及两份南极海洋沉积物开展1摩尔每升氯化氢萃取的动力学研究，我们得出结论：4小时萃取时长可使相对不稳定的金属污染物达到平衡溶解，却不会优先萃取天然地质成因金属。在对南极东部凯西站区域的88份海洋沉积物样品开展的区域调查中，4小时萃取流程与生物数据的相关性最高，且能最清晰地识别出被废弃废物处置场径流污染的沉积物。尤为关键的是，4小时萃取法可通过捕捉人为源金属浓度的细微差异，更精准地界定轻度至中度污染区域。为实现区域间的对比研究，我们推荐采用4小时1摩尔每升氯化氢萃取法作为南极洲金属污染评估的标准方法。
本数据集包含以下字段：浓度（Concentration）、萃取时长（Extraction Time）、锑（Antimony）、砷（Arsenic）、镉（Cadmium）、铬（Chromium）、铜（Copper）、铁（Iron）、铅（Lead）、锰（Manganese）、镍（Nickel）、银（Silver）、锡（Tin）、锌（Zinc）