Table 1. Content and Recovery of Nitrite in Food Products.

food product	nitrite concentration in the blank sample (μg/L)	amount spiked (μg/L)	amount detected (μg/L)	recovery (%)	RSD (%, n = 3)
ham	216.67	500	684.39	93.5	1.9
pickles (cabbage)	58.33	500	584.60	105.3	3.5
bean curd	53.17	500	588.38	107.0	2.7
vegetable (Celery)	42.75	500	575.48	106.6	2.4