Table 3.

Chemical characteristics of thermally activated zeolites (average ± s of three parallel measurements).

Parameter	Measurement unit	NZ100	NZ40
pH	pH units	8.11 ± 0.18	8.14 ± 0.18
SiO2	wt.%	67.5 ± 1.9	67.6 ± 2.5
Al2O3		11.0 ± 0.71	11.4 ± 0.88
Fe2O3		1.34 ± 0.26	1.42 ± 0.21
CaO		1.75 ± 0.31	1.88 ± 0.27
MgO		0.76 ± 0.08	0.74 ± 0.08
K2O		2.51 ± 0.26	2.33 ± 0.29
Na2O		0.34 ± 0.04	0.32 ± 0.04
MnO		0.04 ± 0.01	0.04 ± 0.01
T-As	mg kg−1	<0.50	<0.50
T-Cd		<0.10	<0.10
T-Cr		3.43 ± 0.28	3.09 ± 0.26
T-Cu		9.47 ± 0.82	9.23 ± 0.74
T-Co		<0.20	<0.20
T-Ni		3.31 ± 0.32	3.45 ± 0.28
T-Pb		7.11 ± 0.50	6.36 ± 0.62
T-Zn		20.4 ± 2.02	22.9 ± 2.33
L-As	mg kg−1	0.12 ± 0.03	0.15 ± 0.03
L-Cd		0.01 ± 0.003	0.02 ± 0.004
L-Cr		0.10 ± 0.02	0.11 ± 0.03
L-Cu		0.36 ± 0.08	0.41 ± 0.07
L-Co		<0.013	<0.013
L-Ni		<0.017	<0.017
L-Pb		0.24 ± 0.05	0.28 ± 0.06
L-Zn		0.52 ± 0.07	0.57 ± 0.08