Triton says it is vanadium (V). That is vanadium in the +5 oxidation state, like VO2+. It should be yellowish, unless there is more to it that they are not indicating, such as an organic chelator.
Wikipedia has a picture of the colors as vanadium (V) is reduced to other oxidation states:
en.wikipedia.org
As to the form in seawater:
"In seawater, vanadium ions are in the +5 (V V ) oxidation state as HVO 4 2-or as H 2 VO 4-ions, at very low (35nM) concentrations."
from:
PDF | Marine biodiversity as we see it today on our planet is the result of some four billion years of evolution of life. If the initial stages of this... | Find, read and cite all the research you need on ResearchGate
www.researchgate.net
I’m looking to do the same thing that triton uses