Partition of lead in a milk-pectin aqueous biphasic system with complexing agents

Abstract

Aqueous two-phase systems allow partition of metal ions in nondenaturing conditions. From the fresh skim bovine milk spiked with 212pb and agitated with 4% water solution of apple pectin (degree of esterification ~0%), less than 2.3% is recovered to the pectin phase and in the case of pasteurized milk less than 3.0%. Complexation with chelate forming agents was studied. Aminoacids as glycine, alanine and histidine do not exert influence on the yield, but the recovery in the pectin phase was 22% for cysteine, and 80% in the case of Edtacal TM (calcium salt of ethylenediaminetetraacetic acid). The retention of lead in milk phase is extraordinarily high as compared to strontium and corresponds to the behavior of trivalent ions.

Separation of 97Ru from niobium target using PEG based aqueous biphasic systems

“…This could be due to strong complexation of niobium with citrate, HPO 4 2-and PO 4 3-and bulk Nb prefer to stay in the salt rich phase whereas complaxing ability of Ru with these salts was less and extracted into the PEG phase. Since maximum extraction of 97 Ru was only 50 %, other parameters such as molecular weight of PEG, volume of PEG and pH of salt rich phase were varied to see the effect of these parameters on the extraction profile of NCA 97 Ru.…”

“…[2] combine in specific concentrations. PEG based ABS systems are nontoxic, non-flammable, and inexpensive in nature [3,4].…”

Aqueous biphasic separation of97Ru and95,96Tc from yttrium

“…PEG can be chosen as one of the phase forming components because of its nontoxic, non-ammable, and inexpensive nature. [3][4][5] In addition, the PEG-rich phase in a PEG-ABS system is tunable and, therefore, the phase characteristics of such systems can be modied by ne tuning the PEG-rich phase for better partitioning behavior of the solute into the PEG-rich phase.…”