nmol/kg

nanomole per kilogram

Molalityexact by definition

The nanomole per kilogram is 10⁻⁹ mol/kg, the unit of trace metals in seawater. Dissolved iron in the open ocean runs at a few tenths of a nmol/kg, which is low enough that shipboard contamination controlled the field's results for its first two decades.

1 nmol/kg 1.0000000e-09 mol/kg