Distribution in ocean
Tantalum has a modified, nutrient-like vertical profile.
Concentrations increase with depth, although there is evidence of a subsurface
maxima (data).
Speciation
Tantalum is believed present as Ta(OH)50 and Ta(OH)6-
in seawater.
Analysis
Tantalum is determined by inductively coupled plasma mass spectrometry after
preconcentration.