File Name : figure sm1.pdf Caption : figure sm1. structure of functionalized m@go. File Name : figure sm2.pdf Caption : fig. sm2. time resolved absorbance spectra obtained by hr cs gfaas measurement for 150.0 μg l−1 v, ti, 300 μg l−1 ni and 15 μg l−1 ga (a) without nb coating, spectral range between 294.1349 and 294.4999 nm; (b) with nb coating, spectral range from 294.1349 and 294.4999 nm File Name : figure sm3.pdf Caption : figure sm3. dependence of the ph on the absorption of the element on the sorbent obtained with a standard of 15.0 μg l-1 v, ti, 30 μg l-1 ni and 1.5 μg l-1 ga as described in section 3.2.2. ph study. File Name : figure sm4.pdf Caption : figure sm4. (a) [tio]²⁺ oxo-cation forms in aqueous solutions and (b) vanadate File Name : figure sm5.pdf Caption : figure sm5. optimization of the adsorption time with a standard with 15.0 μg l-1 v, and ti, 30 μg l-1 ni, and 15 μg l-1 ga. (ph 5.5, 2 mg m@go-mts, eluent 1 ml 6 % hno3, elution time 2 min) File Name : figure sm6.pdf Caption : figure sm6. optimization of amount of m@go-mts, 30 μg l-1ti, 60 μg l-1 v, 60 μg l-1 ga and 30 μg l-1 ni (ph 5.5, eluent 1 ml 6 % hno3, adsorption time 5 min).