Table 1.

Mean concentrations (mg/Kg) of elements (Mn, Cu, Zn, and se) measured in ten samples, two samples from each source: Al Kharj, Wadi Al Dawasir, Al Ahsa, Al Qaseem, and Najran in wet weight samples. The results are presented as means ± SD (n =3).

Sample name	Mn	Cu	Zn	Se
Khalas Al Kharj-1	1.95±0.06	0.78±0.03	1.00±0.02	0.10±0.09
Khalas Al Kharj-2	2.18±0.11	1.54±0.11	2.05±0.15	0.04±0.11
Khalas Wadi Al Dawasir-1	3.39±0.07	3.10±0.09	2.30±0.06	0.09±0.12
Khalas Wadi Al Dawasir-2	3.00±0.08	2.13±0.02	2.08±0.06	0.06±0.14
Khalas Al Ahsa-1	2.92±0.22	1.26±0.01	1.42±0.04	0.19±0.19
Khalas Al Ahsa-2	3.69±021	1.04±0.06	1.44±014	0.18±0.21
Khalas Al Qaseem-1	2.79±0.09	1.88±0.14	1.12±0.07	0.02±0.25
Khalas Al Qaseem-2	2.52±0.14	1.72±0.18	1.51±0.16	0.03±006
Khalas Najran-1	2.66±0.11	1.64±0.08	2.27±012	0.09±028
Khalas Najran-2	3.88±014	2.68±014	2.06±003	0.18±013
Average	2.90	1.78	1.73	0.10