Table 3.

Comparison of element maximum concentrations: our findings to other two studies.

Element μg/Kg (ppb)	Max. conc. Our Study	Aldayel et al. (2018)	Iwegbue et al. (2016)
Ag	74	1600	–
Al	3,660,000	31,000,000	–
As	215	793	–
B	27,000	10,700,000	–
Ba	32,260	157,000	–
Be	352	–	–
Ca	107,000	11,600,000	–
Cd	25,070	155	4100
Co	1018	5350	11,100
Cr	6741	5510	33,000
Cu	8123	20,300	6700
Fe	22,116	8,780,000	2,110,000
Hg	5,3	5,2	–
K	32,680	29,100,000	–
Li	3890	63,700	–
Mg	88,720	26,300,000	–
Mn	73,080	117,000	69,000
Mo	0.67	1210	–
Na	10,241	2,570,000	–
P	178,970	–	–
Pb	912	7710	326,000
Sb	597	2650	–
Se	561	4405	–
Sn	791	65,100	–
V	1457	15,700	–
Zn	8,909,200	24,400,000	325,000