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首页> 外文期刊>Desalination and water treatment >Proposal of procedure to determine metals and metalloids background values in contaminated soils. Case study of a national interest site in South Italy
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Proposal of procedure to determine metals and metalloids background values in contaminated soils. Case study of a national interest site in South Italy

机译：关于确定受污染土壤中金属和准金属背景值的程序的建议。义大利南部国家景点的个案研究

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The present work concerns the development of a procedure to determine background values of metals and metalloids in soils of sites of national interest that are subjected to characterization and remediation. The proposed calculation procedure allows to select in metal-metalloid data-set, the representative parameters of site-specific pollution sources. It allows to identify anthropogenic concentration of substances in the soil resulting both natural pedo-geochemical content and moderate widespread immission in soil. The statistical analysis was performed in samples set of topsoil, soil and underground soil. Chemical tests were carried out on all parameters of metals and metalloids present in samples. This work has analized parameters, as As and Be, which have passed statistical test "Shapiro e Wilk" (W test) with contamination "hot spot" of anthropogenic, respect to a large area of substantially homogeneous values. Specifically, this study focuses on area adjacent to perimeter of site of national interest of Brindisi (South Italy). It is characterized by the presence of many process industries and of large power plants. Due to many human activities in this site and difficulty of access to sampling points, analysis was carried out starting from No. 30 sampling sites located in the province of Brindisi. This study was carried out to define a suitable criterion for determination of background concentrations in. industrial area. It was found that cumulative frequency curve deviates greatly from straight trend which represents the trend of other measures. In all cases examined, inflection point was coincident with 90° percentile. On the other hand, value distribution of arsenic concentration in subsoil shows that there are hot spots of contamination probably of anthropogenic origin, different from those found in a other large site that are result substantially homogeneous. However, it is not possible to exclude these points from sample distribution and, therefore, they are estimated. Having to provide a representative background value of concentrations of metals present in area was used a conservative approach based on analysis of discontinuity points in cumulative frequency curve. In this way, background value about contamination anthropogenic source corresponds to previous value at point of discontinuity in cumulative frequency curve (90° percentile). Thus, background conditions would be identified by graphic of concentrations distribution, from the zero point to the point of inflection.
机译：目前的工作涉及确定一种方法的测定方法，该方法可确定经过表征和修复的国家利益遗址土壤中金属和准金属的背景值。拟议的计算程序允许在金属-类金属数据集中选择特定地点污染源的代表性参数。它可以确定土壤中人为引起的物质浓度，从而导致自然的人为地球化学含量和适度的土壤中广泛排放。对表土，土壤和地下土壤的样本集进行统计分析。对样品中存在的金属和准金属的所有参数进行了化学测试。这项工作具有经过分析的参数，例如As和Be，它们已通过统计测试“ Shapiro e Wilk”（W测试），该测试涉及到人为的污染“热点”，相对于大体上均匀的值。具体而言，本研究着眼于布林迪西（意大利南部）国家利益遗址周边的区域。它的特点是存在许多加工业和大型发电厂。由于该站点中有许多人类活动，并且难以获得采样点，因此从布林迪西省的30个采样站点开始进行分析。进行这项研究是为了确定确定工业区域背景浓度的合适标准。发现累积频率曲线与代表其他测度趋势的直线趋势有很大偏差。在所有检查的情况下，拐点均与90°百分位重合。另一方面，地下土壤中砷浓度的值分布表明，存在可能是人为污染的热点，这与在其他大型地点发现的热点基本相同。但是，不可能从样本分布中排除这些点，因此需要对它们进行估计。必须提供具有代表性的区域中金属浓度的背景值，采用保守的方法，基于对累积频率曲线中不连续点的分析。这样，有关污染人为源的背景值对应于累积频率曲线中的不连续点（90％百分数）的先前值。因此，通过从零点到拐点的浓度分布图可以识别背景条件。

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