Fig. 4From: Silica-titania xerogel doped with Mo,P-heteropoly compounds for solid phase spectrophotometric determination of ascorbic acid in fruit juices, pharmaceuticals, and synthetic urineThe coloration of Ti5HPC20 before (left) and after (right) interaction with 200 mg/L of ascorbic acid (see Table 1 for xerogel names)Back to article page