Extraction mechanism of Cr(VI) on the aqueous two-phase system of tetrabutylammonium bromide and (NH4)2SO4 mixture

Autor:	Ahat Sali, Yoshifumi Akama
Rok vydání:	2002
Předmět:	Detection limit Ammonium sulfate Aqueous solution Chromatography Extraction (chemistry) Aqueous two-phase system Analytical Chemistry law.invention chemistry.chemical_compound chemistry law Liquid–liquid extraction Phase (matter) Atomic absorption spectroscopy Nuclear chemistry
Zdroj:	Talanta. 57:681-686
ISSN:	0039-9140
Popis:	An aqueous two-phase system of tetrabutylammonium bromide (TBAB) and (NH(4))(2)SO(4) mixture has been developed for the extractive preconcentration and separation of certain compounds. TBAB concentration in upper phase is much higher than that of bottom solution. This new aqueous two-phase system is proposed for the highly selective extraction of Cr(VI) from large amounts of Cr(3+). The Cr(VI) is found to be extracted into the TBAB-rich upper phase due to ion pair formation such as HCrO(4)(-) . TBAB(+). The Cr(VI) was sufficiently extracted into the upper phase in the pH range from 1 to 5. The proposed method has been applied to the determination of trace of Cr(VI) in wastewater samples with a coefficient of variation less than 3.2%. The recovery obtained was not lower than 90%. The determination limit for the Cr(VI) was found to be 60 mug l(-1) in 10 ml of sample solution.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7684700e3577af4ccc5d41eeb1229a4 https://doi.org/10.1016/s0039-9140(02)00076-0 Zobrazit plný text záznamu Full Text from ScienceDirect