pH value
Concentration (μg/mL) (mean ± SD, n = 2)
3
458.2 ± 6.50
5
270.5 ± 88.65
5.5
302.0 ± 1.62
6
275.0 ± 3.30
6.5
272.0 ± 12.42
7
382.0 ± 55.48
8
342.7 ± 39.16