Fig. 7From: 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 0.01 M and m = 0.75, 1.25 and 2.5 g L−1,\( 0.5\;{\text{h}} \le T \le 72\;{\text{h}}\)Back to article page