Fig. 6From: Statistical optimization of amorphous iron phosphate: inorganic sol–gel synthesis-sodium potential insertionVariations Q in function of pH obtained for Fe2 (HPO4)3*4H2O in NaCl 0.001 M and m = 0.75, 1.25, 2.5 g L−1, \(0.5\;{\text{h}} \le T \le 72\;{\text{h}}\)Back to article page