Ion-pair based liquid–liquid extraction of gold(III) from malonate media using 2-octylaminopyridine as an extractant: analysis of alloys, minerals, and drug samples

Authors : Vishal SURYAVANSHI, Arjun KOKARE, Sunil ZANJE, Abhijeet MULIK, Rupali PAWAR, Makrand PATIL, Ashwini GAIKWAD, Mansing ANUSE, Ganpatrao MULIK

Pages : 1032-1044

View : 18 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :  Liquid-liquid extraction of Auinsert ignore into journalissuearticles values(III); from aqueous sodium malonate medium using 2-octylaminopyridine insert ignore into journalissuearticles values(2-OAP); as an extractant in xylene was achieved. The current work explored the influence of several experimental parameters such as pH, weak acid concentration, extractant concentration, equilibrium time, stripping agents, and aqueous:organic volume ratio on the extraction of Auinsert ignore into journalissuearticles values(III);. The experimental results showed that the Auinsert ignore into journalissuearticles values(III); was quantitatively extracted to about 99.5% by 0.05 M 2-OAP in 0.05 M malonate at 5.0 pH. Ammonia solution was used to strip the gold-loaded organic phase and about 99.5% of Auinsert ignore into journalissuearticles values(III); was reversibly extracted into the aqueous phase. Goldinsert ignore into journalissuearticles values(III); was extracted into the organic phase via formation of ion-pair complex [2-OAPH + + .Au insert ignore into journalissuearticles values(C 3 3 H 2 2 O 4 ); − 2 4);2− ]. The stoichiometry of the extracted species was 1:2:1 insert ignore into journalissuearticles values(metal: acid: extractant); determined by slope analysis. The method affords the binary, ternary mixture separation as well as separation of Auinsert ignore into journalissuearticles values(III); from synthetic mixtures and alloys. The method is applicable for the determination and separation of gold from ayurvedic samples and recovery of gold from e-wastes. A reproduction of the method was checked by finding relative standard deviation for n = 5, which was 0.29%, and the limit of detection was 1.08 μ μ g/mL.
Keywords : Liquid liquid extraction, gold III, sodium malonate, 2 octylaminopyridine 2 OAP, e wastes, ayurvedic samples