Table 4. Content of nitrites and nitrates in natural foods

Foods	Nitrite (mg/kg)	Nitrate (mg/kg)
Vegetables	0.17–5.4	436–1,980
Cabbage	0.17–11.7	82.2–480
Carrot	4.3–12.6	2,422.4–2,610
Celery	61.7	1,754.90
Chicory	0.18–9.03	32–877
Cucumber	2.3–7.2	347–1,100
Egg plant	2.1–4.5	35.7–650
Garlic	1.1	382
Green onion	0.28–16	962–1,725
Lettuce	1.9–4.9	36–609
Onion	3.6–138.4	1,710–2,336.4
Parsley	0.5–5.6	54–376
Potato	15.7	357.7
Pumpkin	3.9	71.3
Sweet potato	0.82–5.5	6.4–175
Tomato	0.17–5.4	436–1,980
Fruits
Apple	5.1	103
Banana	52	444
Cherries	4.2	212
Grapes	7.1	160
Kiwi	5.5	96.5
Melon	4.2–7.65	33.64–223
Orange	4.5	132
Pears	4.3	173
Tangerine	5.3	326
Watermelon	4.8–5.5	26.61–110

Adapted and modified from Suh et al. [53]; Raczuk et al. [54]; Rezaei et al. [55]; Bahadoran et al. [56]; Kmecl et al. [57].