GEMAS – Chemistry of Europe’s Agricultural soils, Single element maps, Br - Bromine

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填图，Geochemical Mapping of Agricultural and Grazing Land Soil in Europe）是EuroGeoSurveys地球化学专家组与Eurometeaux的合作项目。全球共有60余家国际组织与机构参与了本项目的实施。2008至2009年间，项目组以每2500平方公里1个采样点的密度，在33个欧洲国家内采集了2219份农业土壤样品（耕地土壤，0–20cm，即Ap样品）与2127份牧场土壤样品（牧草地土壤，0–10cm，即Gr样品），覆盖总面积达560万平方公里。所有样品均经王水（aqua regia）消解后，分析了52种化学元素，其中41种元素采用X射线荧光光谱法（XRF）测定总量，同时测定了总碳（TC）与总有机碳（TOC）。此外，农业土壤样品还通过可移动金属离子萃取法（MMI®，mobile metal ion）分析了57种元素，并测定了铅同位素（Pb isotopes）。所有分析结果均经过严格的外部质量控制流程。由此，GEMAS项目首次提供了欧洲大陆尺度下元素浓度与元素生物有效性的完全统一协调数据集。 可下载文件以彩色阴影等值线图的形式，展示了不同分析方法测得的元素含量空间分布，并分别采用7级与72级两种分级方案进行配色分类。