Elements	Concentration of elements for site S1 to S5			BBS^*	IRSA^*	WRA^*	WSRA^*	WSA^*
Elements	Min	Max	average ± standard deviation	BBS^*	IRSA^*	WRA^*	WSRA^*	WSA^*
Si	302,336	303100	302,716 ± 346.55	-	-	285,000	275,000	330,000
Al	56,914	59155	57,832 ± 943.52	56,000	-	94,000	69,300	71,000
Fe	28,941	35520	31,030.40 ± 2663.76	29,000	29000	48,000	35,900	40,000
Mg	16,150	17311	16,716.60 ± 518.88	16,500	-	11,800	16,400	5000
Mn	700	850	780 ± 57.01	600	605	1050	720	1000
Cu	29	44	37.20 ± 6.22	17	28	100	32	30
Ni	33	67	48.20 ± 13.37	47	37	90	49	50
Pb	6.77	11.63	9.61 ± 2.03	-	-	150	16	12
Ti	2700	3800	3300 ± 418.33	3100	-	4160	3800	5000
Zn	43	59	51.80 ± 6.42	47	16	350	129	90
K	9000	13000	11,600 ± 1673.32	12,000	-	14,200	24,400	14,000
Ca	17,400	19500	18,660 ± 844.39	19,300	-	21,500	45,000	15,000
Co	8.71	10.53	9.44 ± 0.76	-	-	20	13	8
Cr	87.51	96.38	90.32 ± 3.48	100	87	100	97	70