Abollino O, Aceto M, Malandrino M, Mentasti E, Sarzanini C, Petrella F
Department of Analytical Chemistry, University of Torino, Italy.
Chemosphere. 2002 Nov;49(6):545-57. doi: 10.1016/s0045-6535(02)00352-1.
The distribution and speciation of heavy metals in five agricultural soils of Piedmont Region (north-western Italy) were investigated. Ten metals, namely Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Ti and Zn were considered. Analytical determinations were performed by atomic emission or atomic absorption spectroscopy after microwave sample dissolution in acid solution. Total metal concentrations fit in the typical concentration ranges for unpolluted soils, with the exception of cadmium and lead content in some horizons. The effect of sampling depth on concentrations was discussed. Speciation studies were carried out by applying Tessier's procedure, which allows to subdivide the total metal content into five fractions, representing portions bound to different components of the soil. Moreover, the element labilities in two soils were evaluated by extraction with EDTA. Correlations among the variables and/or similarities among the sampling points were identified by principal component analysis and hierarchical cluster analysis.
对意大利西北部皮埃蒙特地区五种农业土壤中的重金属分布和形态进行了研究。研究考虑了十种金属，即铝（Al）、镉（Cd）、铬（Cr）、铜（Cu）、铁（Fe）、锰（Mn）、镍（Ni）、铅（Pb）、钛（Ti）和锌（Zn）。在酸性溶液中进行微波样品溶解后，通过原子发射或原子吸收光谱法进行分析测定。除了某些土层中的镉和铅含量外，总金属浓度符合未受污染土壤的典型浓度范围。讨论了采样深度对浓度的影响。通过应用 Tessier 程序进行形态研究，该程序可将总金属含量细分为五个部分，代表与土壤不同成分结合的部分。此外，通过用乙二胺四乙酸（EDTA）萃取来评估两种土壤中元素的活性。通过主成分分析和层次聚类分析确定变量之间的相关性和/或采样点之间的相似性。
