Comment: |
SLR = 0.5 or 1 g/L
At the end of the sorption stage, pH measurements were performed as described above and the samples were centrifuged at 12 000 × g for 2 h (Sigma 3-30KH centrifuge). Scattered light intensity measurements (BI-90 particle sizer, Brookhaven Instruments) verified that the supernatants were free of colloids. The selenium concentration in the supernatant, determined by ICP-MS, was used to calculate the amount of adsorbed seleniumIJVI). Se uptake on the walls of
polypropylene vials was found to be negligible.
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