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Can someone please draw the scheme of Selenium: "A sample is preserved in the field at 4oC. The sample aliquot is oxidized, in acidic persulphate, to Selenate (Se-6O4)-2, reducted to selenite (Se-4O3)-2 in HCl, then converted to its hydride form (hydrogen selenide: H2Se) with sodium borohydride in an acid medium"

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