Table 3.

Comparative study between GO/SPE and ICP-MS for As(III) and Fe(III) quantification.

Sample As(III)	GO/SPEs by SWCSV (μg/L)	Total Inorganic As: [As(III) + As(V)] Total Inorganic Fe: [FeO + Fe3O4 + Fe2O3] (μg/L)	ICP-MS (μg/L)	P Value (t-Test)a
1	992 ± 2	101 ± 2	100.80 ± 0.5	0.01
2	100 ± 1	100 ± 1	100.00 ± 0.02	0.03
3	102 ± 2	103 ± 1	103.05 ± 0.5	0.02
Sample Fe(III)
1	399 ± 1	400 ± 1	400 ± 1	0.04
2	400 ± 2	400 ± 2	400 ± 0,2	0.01
3	402 ± 1	403 ± 0.3	403 ± 1	0.03

^a: two-sided t-test to compare means from heteroscedastic data. Data reported on Table 3 are reproduced and reprinted with permission from [16].