Table 11.

Reagent real time stability

Month	Lot	Reagent blank, A420nma	Sensitivity, mA420nm·L/mgb	Accuracy, ratioc
0	001	0.055	42.4	1.05
0	002	0.065	45.1	1.07
0	003	0.065	44.7	1.06
7	001	0.072	42.0	1.02
10	001	0.070	40.9	1.03
10	002	0.077	42.6	1.04
19	001	0.073	41.1	1.01
27	002	0.068	39.6	1.06
32	001	0.061	38.4	1.03
40	001	0.071	31.4	1.05

^aabsorbance of the reagent blank at 420 nm.

^bRatio of the absorbance (in milli-absorbance) obtained with the calibrator 3 by and the concentration of the same calibrator (10 mg/L).

^cRatio of the concentration (mg/L) obtained in the control of the reagent and the and the concentration (mg/L) of the reference material.