Table 3. Effect of frequency on the percentage of species generated in the solid recovered from a solution 0.005 mol L⁻¹ NaNH₄HPO₄ at 53 mA and 5 cm of distance between electrodes^a.

Frequency, Hz	Struvite	MgHPO4	Mg(OH)2, MgO and others
0	23.02	6.18	70.80
0.01	51.18	47.88	0.94
0.001	75.51	22.16	2.33

^aThe treatment of 0 Hz is that presented in the latter section, without polarization.