Table 4.

Characteristics of the analytical method for nitrate and nitrite.

	Calibration curve		R 2	Linearity (mg kg−1)	LOD (mg kg−1)	LOQ (mg kg−1)	Recovery (%)
Beverage	Nitrate	y = 0.1008x + 0.0353	0.9993	2.5–15	0.5	1.4	95–101
	Nitrite	y = 0.1665x + 0.0981	0.9967	2.5–15	0.5	1.4	98–109
Fruit	Nitrate	y = 0.1032x + 0.0541	0.9979	2.5–15	1	2.8	91–99
	Nitrite	y = 0.1214x − 0.0508	0.9956	2.5–15	1	2.8	97–104
Vegetable	Nitrate	y = 0.1195x + 0.0243	0.9961	2.5–15	1	2.8	90–96
	Nitrite	y = 0.1415x − 0.0181	0.9949	2.5–15	1	2.8	98–102
Stew	Nitrate	y = 0.1168x + 0.1735	0.9917	2.5–15	0.5	1.4	89-90
	Nitrite	y = 0.1262x − 0.0597	0.9883	2.5–15	0.5	1.4	92–96