Selenium

1g Dry sample 6 0 C 24h 50ml 0.5M HCl Centrifuge 2000 (rpm) Decant the above solution. Extract Filter (0.45 µm) Extract 5.5 ml CH 2 Cl 2 shake 15 minutes Organic phase 10ml n-hexane (3 times) Water phase 5ml CH 2 Cl 2 (2 times) Aqueous extract Extract Aqueous Phase shake 5 minutes shake 5 minutes ...

To further remove the fat in the aqueous phase, we added different volumes of n-hexane to the aqueous phase extract of the standard sample and performed multiple extractions. - Extract with 5ml n-hexane Se-cyst c = 19.421 µg/L +/- 1.495 µg/L (7.70%) -200n -150n -100n -50.0n -1.9e-005 0 -2.00e-5 0 ...