Table 2.

The effect of interferences on the determination of MNs (n = 5).

Added interferences (mg/L)		Concentration of MNs (mg/L)
		Measured	X T − X C	1.96 S
Blank	0.0	2.43	—	0.32
Urea	250.0	2.38	−0.05	N
	500.0	2.20	−0.23	N
Creatinine	50.0	2.44	0.01	N
	100.0	2.29	−0.14	N
Ascorbic acid	50.0	2.33	−0.10	N
	100.0	2.39	−0.04	N
Uric acid	50.0	2.32	−0.11	N
	100.0	2.42	−0.01	N