. 2025 Aug 15;15(35):28929–28936. doi: 10.1039/d5ra02880a

Table 2. Effect of frequency in the percentage of removal of N-NH⁴⁺ and P-PO₄³⁻, Mg²⁺ concentration, and solid recovered in a solution 0.005 mol L⁻¹ NaNH₄HPO₄ at 53 mA and 5 cm of distance^a.

Frequency, Hz	Removal, %		Mg²⁺, mg L⁻¹ CaCO₃	Solid formed, g
Frequency, Hz	P-PO₄³⁻	N-NH⁴⁺	Mg²⁺, mg L⁻¹ CaCO₃	Solid formed, g
0.1	16.67	5.78	ND	0.11
0.01	64.75	58.41	14.00	0.29
0.001	86.89	83.02	28.00	0.51
0	98.14	98.33	106.31	0.68

ND, not detectable; 0 Hz is the treatment presented in the latter section, without polarization.

Table 2. Effect of frequency in the percentage of removal of N-NH4+ and P-PO43−, Mg2+ concentration, and solid recovered in a solution 0.005 mol L−1 NaNH4HPO4 at 53 mA and 5 cm of distancea.