Extraction of Chromium With Trioctylphosphine Oxide

Solvent Extraction of Inorganic Ions with Tri-n-octyl Phosphine Oxide

“…The present Kd values for zirconium, which were obtained with carrier-free tracer after 25min equilibra tion, fall just between two extraction curves with 9.35mg Zr and 16.8mg Zr given by White and Ross (9). The Kds for Cr (III) (7) and Fe(III) (4) agree well with those of White and Ross.…”

Extractive removal of chromium (VI) from industrial waste solution

“…Thus, only a limited number of potential extractant such as, [13][14][15]. Several workers [16,17] studied the Cr extraction with tri-n-octylphosphine oxide (TOPO). Tuck and Walters studied the Cr (VI) extraction using tri-butylphosphate (TBP) from various mineral acids at both trace and macro concentrations and suggested that the species extracted from hydrochloric and hydrobromic acid is HCrO 3 X (X = Cl or Br) while from other acids it is HCr 2 O 7 − [18].…”

Flowsheet for the Recovery and Purification of 63Ni

“…For target A, two cycles of oxidation/ extraction (two contactings per cycle) were required to remove the large inventory of 51 Cr. The separation factor for each extraction cycle was only about 10 (Table 5), which is somewhat disappointing since a literature value [18,19] of about 100 is quoted for the chromium distribution coefficient under these conditions. For the second target special care was taken to ensure complete oxidation of the chromium, and the extra precaution of pretreating the solvent with a small amount ( ~ 1 mmol) of NaBr0 3 oxidant was taken 9 .…”