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Environmental fate & pathways

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Physicochemical processes like phototransformation and hydrolysis are not relevant for the black pigment due to the lack of fluorophoric groups and non-measurable water solubility (at all pH-values). Lead is present as lanarkite predominately. Formation of different Pb-hydroxides may occur, but the chemical assessment cannot make any differentiation among the different Pb-species (pooling of different speciation forms). In addition, magnetite (Fe3O4) is virtually insoluble in the environment at the prevailing pH-domain.


Consequently, (abiotic) degradation is an irrelevant process for the black pigment.

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