GEMAS – Chemistry of Europe’s Agricultural soils, Single element maps, Mo - Molybdenum

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. All samples were analysed for 52 chemical elements after an aqua regia extraction, 41 by XRF (total), TC and TOC. In addition, the agricultural soil samples were analysed for 57 elements in a mobile metal ion (MMI®) extraction and Pb isotopes. All analytical results were subject to tight external quality control procedures. The GEMAS project thus provides for the first time fully harmonised data for element concentrations and bioavailability of the elements at the continental (European) scale. The downloadable files present the areal distribution of the element contents determined by different analytical methods in the shape of colour shaded contour maps with a classification in 7 and 72 levels each.GEMAS（欧洲农业与牧场土壤地球化学制图，Geochemical Mapping of Agricultural and Grazing Land Soil in Europe）是欧洲地质调查专家组（EuroGeoSurveys）与欧洲金属统计协会（Eurometeaux）的合作项目，全球范围内共有超过60个国际组织与机构参与了本项目的实施。2008至2009年间，项目组从欧洲33个国家中以每2500 km²布设1个采样点的密度，采集了2219份农业土壤样本（耕地土壤，0–20 cm深度，记为Ap样本）与2127份牧场土壤样本（牧草地土壤，0–10 cm深度，记为Gr样本），覆盖总面积达560万km²。所有样本均经王水（aqua regia）提取后，对52种化学元素开展了检测，其中41种元素采用X射线荧光光谱法（XRF）测定总量，同时完成了总碳（TC）与总有机碳（TOC）的分析。此外，针对农业土壤样本，还通过可移动金属离子（MMI®）提取法对57种元素以及铅同位素进行了分析。所有分析结果均经过严格的外部质量控制流程审核。因此，GEMAS项目首次提供了欧洲大陆尺度下统一标准化的元素浓度与元素生物有效性数据集。 可下载文件以彩色晕染等值线图的形式，展示了不同分析方法测得的元素含量空间分布，该图集分别设置了7级与72级两种分类标准。