Enrichment factor — A novel method to represent the trace elemental concentration in Vellar estuary

摘要

Elemental concentrations are higher in the clay fraction than in the bulk samples. However, the enrichment factor shows that the elemental concentrations are higher in bulk samples than in the clay fractions. The enrichment factor suggests that the enhancement of trace elements due to ionic exchange in clay minerals is negligible, and it may be ascribed to the adsorption and absorption by iron oxide coating on clay minerals and other matters.