Extraction of arsenic(III) in aqueous two-phase systems: A new methodology for determination and speciation analysis of inorganic arsenic

Atomic spectrometry update: review of advances in elemental speciation

“…The As V concentrations determined using an alternative SPE procedure were in good agreement with the concentrations obtained using HPLC-ICP-MS. A LLE technique using an aqueous two-phase system formed by a polymer and electrolyte for the extraction, determination, and speciation analysis of iAs has been reported. 42 The pH, nature of the aqueous two-phase system forming the electrolyte and the polymer, tie-line length (TLL) of the system, type and concentration of extractants, and the mass ratio of the top and bottom phases were optimised. The highest extraction (98%) was obtained for an aqueous two-phase system composed of copolymer L64 (poly(ethylene oxide- b -propylene oxide- b -ethylene oxide)) with sodium sulfate and water at pH 6.0, tie-line length 33.55% w/w using APDC extractant in a molar ratio (APDC/As III ) of 960, and with a mass ratio of 1/4.…”