Nickel is a metal commonly found in many naturally occurring
ores. Industrially, the greatest use of nickel is in the
manufacture of stainless steel and other alloys [31]. On Shuttle
and ISS, the source of nickel in water samples is linked
to the stainless steel components used in plumbing hardware
[1]. In such systems, nickel is usually present in the +2 oxidation
state which forms a 1:2 stoichiometric complex with
DMG [32]. Moreover, the complexation of nickel(II) with
DMG involves the loss of a proton, so the rate and extent of
complexation are pH dependent