Selenium isocontent map (Geochemical Atlas of Spain, 2012)

Iso-content maps of Selenium (Se), one of the chemical elements.obtained in the Geochemical Atlas of Spain Project, distributed in stream sediments (14,864 samples), superficial soils (0-20 cm.) (13,505 samples) and deeper soils (20-40 cm.) (7,682 samples). The results of the chemical analysis are shown in two types: total dissolution of the sample with 4 acids and partial dissolution with aqua regia. With the analytical results of all the sampled points, an isocontent map is made with adjustment to a square grid of 1,000 m by the method of interpolation of the inverse of the squared distance. The final result is a map for each type of sample and type of analysis carried out.化学元素硒（Selenium，Se）的等值含量图源自西班牙地球化学图集项目（Geochemical Atlas of Spain Project），采样介质涵盖河流沉积物（14864件样品）、表层土壤（0~20厘米，13505件样品）及深层土壤（20~40厘米，7682件样品）。本次化学分析包含两种测试类型：采用4酸体系对样品进行全消解，以及采用王水进行部分消解。基于所有采样点的分析结果，通过反距离平方插值法将数据投影至1000米×1000米的正方形网格，最终生成等值含量图。最终成果为针对每类采样介质与分析方法的系列等值含量图。