Distribution of elements in floodplain sediment

Flooplain sediment samples were collected from the great cathment basins (>500-6, 000 km2).Floodplain sediments reflect the gochemistry of overburden in the entire upstream river basin, because fine grained alluvium (silt and clay) is carried in suspension from eroded source materials over very long distance, and is finally deposited on the floodplain in low energy environments. For the description of element distribution in floodplain sediments two groups of values were used: 1) Low values group ranging from the minimum up to the 25th percentile, and 2) High values group representing the values from the 75th percentile up to the maximum.