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Effect of pH on the extraction of Silver from X-ray films using Red mangrove Bark Ash Solution

Author Affiliations

  • 1Department of Pure and Industrial Chemistry, University of Port Harcourt, Rivers State, Nigeria
  • 2Department of Science Laboratory Technology, School of Science, Port Harcourt Polytechnic, Rivers State, Nigeria

Res.J.chem.sci., Volume 8, Issue (3), Pages 11-15, March,18 (2018)

Abstract

This work investigated the effect of change in pH of Red Mangrove Ash Bark Solution (RMBAS) as stripping solution for the extraction of Silver from waste X ray films. using Four sets of Mangrove bark ash, 10, 20, 50, 70 and 100g were weighed and each dissolved in 500 ml of de-ionised water and left to homogenize for 48 hours before filtration, these solutions were alkaline tested to be alkaline. Another set of six solutions were prepared from the100g solution with pH values adjusted to acidic and neutral by 1 M HCl acid (pH 2.5,3.5,4.0, 5.0 6.0 7.5). Waste X ray films (cut into pieces) were kept in each solution in a water bath at 60OC and stirred at intervals for 1 hour until the films appeared clean and free from the dark spots. The stripping solutions were analysed for Silver using Solar Thermo Atomic Adsorption Spectrometer (Flame AAS) model S4- 71096. Results obtained showed that pH of the stripping solutions affected the extraction of Silver from the waste X ray films. Silver was recovered more as Ag+ than as Ag(OH)2+. Higher concentrations of Ag+(28.50 -13.36mg/kg) was recorded for the acidic stripping solutions than the alkaline (3.94 mg/kg) or neutral solutions (8.72-5.30mg/kg). Amount of recovered Silver ion decreased as the pH of the solution increased. Therefore, more Silver was extracted as the ion; Ag+ by the acidic RMBAS solution with pH 2.5 -5.0 .Higher concentrations of RMBAS had previously been confirmed to strip Silver from photographic wastes in the complex ion form, Ag(OH)2+. This work has therefore established that under same stripping conditions, higher concentrations of acidic RMBAS extract Silver as Ag+ rather than, Ag (OH)2+ from waste X ray films.

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