Table 2.

Tolerance limit for foreign species on the determination of 2.0 μg mL^–1 of ascorbic acid.

Foreign species	Tolerance limit (Wspecies/Wascorbic acid)
Na+, K+, Ca2+, Mg2+, NH4+	1000
MeOH, EtOH, Sulfamic acid	1000
Glucose, Saccarose	950
Fructose	900
Zn2+, Mn2+, Co2+	850
Fe3+ a	800
Urea	650
Uric acid, citric acid	320
NO3-, CN-, CO32-, SO42-, CH3CO2-, F-	1000
C2O42-	900
I-, Br-, Cl-	75
NO2-	10

^a After adding 2 mL of 3% NaF.