Radiochemical determination of chromium in biological tissues by ion-exchange

Papadopoulou, C.; Kanias, G. D.; Hadzistelios, I.

doi:10.1007/bf02518504

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…For performing the reductive elution of Cr(VI), var-ORDER REPRINTS ious reductant solutions, such as 9% ascorbic acid in 1 M HCl (16), hydroxylamine in 1 M H 2 SO 4 (17), ammonium ferrous sulfate in 1 M HCl (18), 10% NH 2 OH и HCl (19), 5% Na 2 SO 3 in 0.1 M HCl (20), and 0.01M Na 2 SO 3 in 0.1 M H 2 S0 4 (21), were used.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Copper (Ii) and Chromium (Iii,vi) From Electroplating-Industry Wastewater by Ion Exchange

Yalçın

Apak

Hızal

et al. 2001

Separation Science and Technology

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Two laboratory-scale separation processes have been developed for the recovery of copper (II) from acidic and cyanide-containing alkaline wastewater of electroplating industries. Acidic bath wastes were treated with Dowex 50X8, a strongly acidic cation-exchange resin, and the retained copper was eluted with H 2 SO 4 . The cyanide-containing alkaline bath waste was first oxidized with excessive hypochlorite, then neutralized, and recovered by the use of Amberlite IRC-718 chelating resin. Copper was eluted with H 2 SO 4 .The two different valencies of chromium have been recovered from electroplating-industry wastewater by different separation processes: The predominant valency, Cr(VI), was retained on a strongly basic Dowex 1X8 resin and eluted with a NaCl and ORDER REPRINTS NaOH solution. Alternatively, Cr(III), either existing originally in electroplating-industry waste-rinse mixtures or converted from Cr(VI) by reduction with Na 2 SO 3 , could be recovered by a weakly acidic Amberlite IRC-50 resin and eluted with a solution containing H 2 O 2 and NaOH. Where plating industry wastes contain high levels of organic contamination, Cr(VI) would be naturally reduced to Cr(III) upon acidification, and it may be more economical to recover all chromium as Cr(III).

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