González-Costa Juan José, Reigosa Manuel Joaquín, Matías José María, Fernández-Covelo Emma
Department of Plant Biology and Soil Science, Universidad de Vigo. Vigo, Spain.
Department of Statistics and Operational Research, Universidad de Vigo. Vigo, Spain.
PLoS One. 2017 Jan 10;12(1):e0168523. doi: 10.1371/journal.pone.0168523. eCollection 2017.
This study determines the influence of the different soil components and of the cation-exchange capacity on the adsorption and retention of different heavy metals: cadmium, chromium, copper, nickel, lead and zinc. In order to do so, regression models were created through decision trees and the importance of soil components was assessed. Used variables were: humified organic matter, specific cation-exchange capacity, percentages of sand and silt, proportions of Mn, Fe and Al oxides and hematite, and the proportion of quartz, plagioclase and mica, and the proportions of the different clays: kaolinite, vermiculite, gibbsite and chlorite. The most important components in the obtained models were vermiculite and gibbsite, especially for the adsorption of cadmium and zinc, while clays were less relevant. Oxides are less important than clays, especially for the adsorption of chromium and lead and the retention of chromium, copper and lead.
本研究确定了不同土壤成分及阳离子交换容量对镉、铬、铜、镍、铅和锌等不同重金属吸附和保留的影响。为此，通过决策树创建了回归模型，并评估了土壤成分的重要性。使用的变量包括：腐殖化有机质、比阳离子交换容量、砂和粉砂的百分比、锰、铁和铝氧化物及赤铁矿的比例、石英、斜长石和云母的比例，以及不同粘土（高岭石、蛭石、三水铝石和绿泥石）的比例。所得模型中最重要的成分是蛭石和三水铝石，特别是对于镉和锌的吸附，而粘土的相关性较小。氧化物比粘土的重要性低，特别是对于铬和铅的吸附以及铬、铜和铅的保留。
