A Simple Automated Method for the Determination of Nitrate and Nitrite in Infant Formula and Milk Powder Using Sequential Injection Analysis

Table 3

Figures of merit. LD = detection limit, LQ = quantification limit, m = sensitivity (slope of calibration curve). LD and LQ calculated for real samples.

	Nitrate	Nitrite
Parameter	Nitrate (NO3-N)	Nitrite (NO2-N)
Limits, solution
LD (mg L^−1), (3 𝜎/m, 𝑛=10)	0.17	0.025
LQ (mg L^−1), (10 𝜎/m, 𝑛=10)	0.55	0.084
Limits, real samples
LD (mg kg^−1), (3 𝜎/m, 𝑛=5)	0.32	0.05
LQ (mg kg^−1), (10 𝜎/m, 𝑛=5)	1.08	0.17
Precision (sr (%), 𝑛=5)	1.5–3.0	0.8–1.6
Linearity range (mg L^−1)	0.55–15.0 (𝑟^2>0.999)	0.084 - 1.01 (𝑟^2>0.999)
Sampling rate (hour^−1)	30	80