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 |