Table 1.

Analytical results obtained on certified reference materials for soil and crops.

Elements	Observations	GSS-5 ± STD	Certified ± STD	Recovery %	GSS-8 ± STD	Certified ± STD	Recovery %
Cr (mg/kg)	6	118 ± 10	118.17 ± 8.18	100.14%	68.0 ± 8.0	66 ± 2.7	97.06%
Ni (mg/kg)	6	40 ± 5	40.67 ± 3.33	101.68%	31.5 ± 2.7	33.2 ± 1.9	105.40%
Cu (mg/kg)	6	166 ± 9	164.00 ± 7.32	98.80%	24.3 ± 1.8	23.4 ± 2.2	96.30%
Zn (mg/kg)	6	494 ± 39	491.50 ± 22.13	99.49%	68 ± 6	65.3 ± 2.5	96.03%
As (%)	6	4.12 ± 2.4	414.67 ± 20.55	100.65%	12.7 ± 1.7	12.4 ± 0.5	97.64%
Hg (mg/kg)	6	290 ± 40	302.33 ± 9.48	104.25%	17 ± 4	15.7 ± 3.4	92.35%
Cd (%)	6	045 ± 0.09	0.46 ± 0.05	102.22%	1300 ± 500	1291 ± 70	99.31%
Pb (mg/kg)	6	552 ± 44	562.00 ± 42.98	101.81%	21.0 ± 3.0	21.5 ± 2.3	102.38%
Elements mg/kg	Observations	GBW08503 /GSV-3 ± STD	Certified ± STD	Recovery %	GBW10012 /GSV-3 ± STD	Certified ± STD	Recovery %
Cr	12	0.55 ± 0.07	0.53 ± 0.04	96.36%	0.55 ± 0.07	0.50 ± 0.01	90.91%
Ni	12	1.9 ± 0.3	2.0 ± 0.1	105.26%	0.097 ± 0.014	0.095 ± 0.014	97.94%
Cu	12	4.40 ± 0.31	4.55 ± 0.41	103.41%	0.66 ± 0.08	0.63 ± 0.08	95.45%
Zn	12	22.7 ± 2.0	21.64 ± 1.44	95.33%	2.9 ± 0.3	3.02 ± 0.42	104.14%
As	12	0.22 ± 0.02	0.21 ± 0.02	95.45%	0.028 ± 0.006	0.03 ± 0.01	107.14%
Hg	12	0.026 ± 0.003	0.025 ± 0.003	96.15%	0.026 ± 0.003	0.025 ± 0.003	96.15%
Cd	12	0.031 ± 0.002	0.031 ± 0.005	100.00%	0.32 ± 0.07	0.33 ± 0.04	103.13%
Pb	12	0.35 ± 0.08	0.36 ± 0.07	102.86%	0.07 ± 0.02	0.07 ± 0.01	100.00%