Coprecipitation behaviour of 5,8-polyquinolyl polydisulphide for trace element preconcentration from aqueous solution
✍ Scribed by Magnuss Vircavs; Vallija Rone; Agrida Pelne; Daina Vircava
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 861 KB
- Volume
- 299
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The oxidation product of SH-containing reagent such as 5&dimercaptoquinoIine was used for the coprecipitation of traces of non-transition and transition d-element from aqueous solution. The coprecipitation behaviour of 5,8-polyquinolyl polydisulphide (PQPD) for the preconcentration of V(IV), Cr(III), Mn(II), Fe(III), Co(III), Ni(II), C&I), Zn(II), Ga(III), As(III), Se(W), Mo(VI), Ru(III), Pd(II), Cd(U), In(III), Au(III), Hg(II), Ir(III), Os(II1) and Pt(I1) is discussed. In special cases the coprecipitation of the inner complex of 5,8-dimercaptoquinoline is compared with that using quinoline-8-thiol. The formation of the PQPD solid phase and the coprecipitation of inner complex compounds of 5,Ekdimercaptoquinoline occur over a wide range of acidity from 1.5 mol 1-l HCl to pH 12. For all the above elements the recovery is more than 95%, with the exception of Ir(IlI>, for which it is 85%. For the coprecipitation it is sufficient to use 60 mg of 5,8-dimercaptoquinoline for 1 1 of aqueous solution, in contrast to quinoline-8-thiol, where 100 mg are needed.