Table 3.

Heavy metals concentration in studied ash samples.

	Metals (µg/g)
	Zn	Cu	Cr	Pb	Cd	Ni	Hg	As
P1
BA
Spring	1696.13	1097.90	430.48	157.73	20.12	38.90	0.051	0.099
Summer	2028.65	537.38	411.05	74.32	12.32	15.14	0.01	0.081
Autumn	1950.21	475.28	671.26	1.36	26.47	21.72	0.021	0.142
Winter	1537.11	556.56	455.50	130.09	14.07	37.36	0.013	0.293
SFA
Spring	2366.87	424.80	488.56	64.39	16.3	22.98	0.001	0.047
Summer	3068.62	370.31	627.53	76.60	18	23.10	0.004	0.341
Autumn	2566.08	525.23	540.82	66.50	18.74	17.39	0.003	0.014
Winter	2773.41	202.35	576.64	77.50	16.94	23.84	0.004	0.065
FA
Spring	7380.12	2551.12	466.78	3197.23	397.7	18.86	0.31	0.201
Summer	8004.99	2025.04	336.53	3029.88	345.04	14.80	0.121	0.06
Autumn	5374.87	1742.83	564.72	1790.57	194.71	23.96	0.523	0.481
Winter	7737.5	2019.82	576.17	2586.06	285.49	16.73	0.323	0.012
P2
BA
Spring	1105.17	504.38	371.69	142.12	14.14	18.99	0.011	0
Summer	2668.85	645.48	315.71	73.29	12.75	10.78	0.023	0.006
Autumn	991.75	429.28	373.74	124.34	13	18.10	1.031	0.23
Winter	1008.04	596.77	356.39	82.27	14.29	13.42	0.044	0.08
SFA
Spring	3342.46	346.47	371.65	1102.60	124.27	38.14	2.081	0.124
Summer	1473.03	325.19	526.85	81.54	13.24	15.87	0.014	0
Autumn	1404	252.55	517.68	72.46	15.34	12.86	0.116	0.198
Winter	1408.21	183.46	502.62	78.90	12.56	20.75	0.652	0.077
FA
Spring	10,960.03	1476.27	301.80	5702.26	626.02	8.62	15.961	0.253
Summer	12,770.4	1681.49	8829.45	5787.78	484.49	14.26	5.302	0.177
Autumn	8312.56	1645.11	245.24	3254.94	290.03	13.84	19.57	0.105
Winter	6387.37	1670.37	390.21	2555.06	277.5	11.26	1.453	0.185