Aqua regia extractable trace elements in surface soils of venezuela

摘要

Surface soils (0-15 cm) were sampled at 10-20 km intervals along two transect in Venezuela. One (1162 km, 70 samples) ran west to east parallel with the Caribbean coastline, the Other (920 km, 92 samples) ran south to north from the frontier with Brazil to the Caribbean shore. Sampling took place in both a wet and a dry season. Trace metals were extracted from dried, sieved (＜2 mm) soil with boiling aqua regia followed by analysis by ICP or flame AAS.