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Table 5 Solid spectrophotometric determination of ascorbic acid in various samples (n = 3, P = 0.95)

From: Silica-titania xerogel doped with Mo,P-heteropoly compounds for solid phase spectrophotometric determination of ascorbic acid in fruit juices, pharmaceuticals, and synthetic urine

Sample
(AA declared content)
Found with solid phase spectrophotometry
(RSD,  %)
Found with titrimetric method (RSD,  %)
Synthetic urine spiked with 20 mg L−1 of ascorbic acid 20.46 ± 2.34 mg L−1 (6.7) 19.58 ± 0.81 mg L−1 (2.4)
Naturetto vitamin tablets
(7 mg/tablet)
7.29 ± 0.81 mg/tablet (6.5) 7.00 ± 0.20 mg/tablet (1.7)
Naturino vitamin tablets
(11.25 mg/tablet)
10.43 ± 0.95 mg/tablet (5.3) 10.73 ± 0.55 mg/tablet (3.0)
Orange juice
(200 mg L−1)
179.30 ± 21.50 mg L−1 (7.0) 175.00 ± 10.66 mg L−1 (3.6)
Blood orange juice
(90 mg L−1)
101.67 ± 12.73 mg L−1 (7.3) NDa
  1. aNot determined, due to red color of the sample interfering with establishing titration endpoint