Table 2. Mineral composition of watermelon

Minerals	Watermelon	Watermelon juice	Watermelon rind	Watermelon pulp	Watermelon rind flour	Watermelon seed flour	Watermelon seed
	Quantity (Per 152 g)	Quantity (Per 152 g)	Quantity (Per 100 g)	Quantity ppm	Quantity (Per 100 g)	Quantity (Per 100g)	Quantity (Per 100 g)
Calcium	10.64 mg	4-14 mg	29.15 mg	0.136 ppm	28.00 mg	150 mg	54 mg
Iron	0.36 mg	0.08-0.55 mg	1.29 mg	0.242 ppm	4.63 mg	12.1 mg	7.28 mg
Fluoride	NR	1-2.1 μg	NR	NR	NR	NR	NR
Magnesium	15.20 mg	5-12 mg	1.48 mg	0.167 ppm	30.40 mg	542 mg	515 mg
Phosphorous	16.72 mg	5-19 mg	135.24 mg	NR	129.70 mg	1,279 mg	755 mg
Potassium	170.24 mg	58-191 mg	1.37 mg	0.158 ppm	21.70 mg	1,179 mg	648 mg
Sodium	1.52 mg	0-5 mg	12.65 mg	0.140 ppm	11.40 mg	33 mg	99 mg
Zinc	0.15 mg	0.04-0.63 mg	1.29 mg	0.086 ppm	1.25 mg	10.6 mg	10.24 mg
Copper	0.06 mg	0.006-0.166 mg	0.45 mg	NR	0.40 mg	2.1 mg	0.686 mg
Manganese	0.06 mg	0-0.08 mg	1.42 mg	NR	1.30 mg	9.9 mg	1.614 mg
Boron	142.50 μg	NR	NR	NR	NR	NR	NR
Selenium	0.61 μg	0-0.7 μg	NR	NR	NR	NR	NR
References	(Mateljan, 2020)	(USDA, 2020)	(Gladvin et al., 2017)	(Etejere and Olayinka, 2018)	(Anthony and Egbuonu, 2015)	(El-Adawy and Taha, 2001)	(USDA, 2020)