GEMAS – Chemistry of Europe’s Agricultural soils, Parameters and indices, Kd values for Lead (Pb)

GEMAS (Geochemical Mapping of Agricultural and Grazing Land Soil in Europe) is a cooperative project between the Geochemistry Expert Group of EuroGeoSurveys and Eurometeaux. In total, more than 60 international organisations and institutions worldwide were involved in the implementation of the project. During 2008 and 2009, a total of 2219 samples of agricultural (arable land soils, 0 – 20 cm, Ap samples) and 2127 samples of grazing land (pasture land soils, 0 – 10 cm, Gr samples) soil were collected at a density of 1 site/2 500 km² each from 33 European countries, covering an area of 5,600,000 km². In addition to the chemical element contents, soil properties and soil parameters such as pH, particle size distribution, effective cation exchange capacity (CEC), MIR spectra and magnetic susceptibility were investigated in the samples and some coefficients were calculated. The downloadable files present the areal distribution of the determined Kd values (soil-solution partitioning values) for Lead (Pb) in the shape of colour shaded contour maps.GEMAS（欧洲农业与牧场土壤地球化学填图计划，Geochemical Mapping of Agricultural and Grazing Land Soil in Europe）是欧洲地质调查协会（EuroGeoSurveys）地球化学专家组与欧洲金属协会（Eurometeaux）联合发起的合作项目。全球范围内共有超过60家国际组织与机构参与了本项目的实施工作。2008至2009年间，研究团队从欧洲33个国家以每2500平方公里1个采样点的密度，采集了2219件农业土壤样品（耕地表层0~20cm土壤，即Ap样品）与2127件牧场土壤样品（牧草地表层0~10cm土壤，即Gr样品），整体覆盖面积达560万平方公里。除化学元素含量测定外，研究人员还对样品的土壤理化性质与相关参数进行了系统分析，涵盖pH值、粒度分布、有效阳离子交换量（CEC，effective cation exchange capacity）、中红外光谱（MIR spectra）与磁化率，并计算得到了部分相关系数。本次可下载文件以彩色晕染等值线图的形式，呈现了所测定的铅（Pb）对应的Kd值（土壤-溶液分配系数，soil-solution partitioning values）的空间分布特征。