Table 3.

The rate of mass change of Zn(Hg) and Zn per unit area

Rate of mass change per unit area μg cm−2 h−1*
Medium	Zn(Hg)	Zn
NH4Cl (0.1M)	−2.5	−7.7
NH4Cl (25 wt percent) + 3 molal ZnCl2	−1.7	−8.0
Distilled water	+1.6	+2.6

^*The estimated uncertainty in these measurements is 0.5 μg cm⁻² h⁻¹.