Preconcentrative separation of chromium(VI) species from chromium(III) by coprecipitation of its ethyl xanthate complex onto naphthalene

Solid phase extraction of iron and lead in environmental matrices on amberlite xad-1180/pv

“…The quantitative recovery values were obtained for analyte ions in 0.05 mol/L Na 3 PO 4 , 0.25 mol/L NaF, 0.90 mol/L NaCl, 0.11 mol/L Na 2 SO 4 , 0.14 mol/L KNO 3 Soylak et al…”

“…Because of the higher costs of the instrumental techniques like ICP-MS, generally the separation preconcentration techniques are preferred 1,2 . Preconcentrative separation techniques including coprecipitation 3,4 , solvent extraction 5,6 , membrane filtration 7 , cloud point extraction 8 and ion exchange 9 have been used for the traces heavy metal ions in environmental samples.…”

Thiacalix[4]arene Derivatives Bearing Imidazole Units: A Ditopic Hard/Soft Receptor for Na+ and K+/Ag+ with an Allosteric Effect and a Reusable Extractant for Dichromate Anions

“…21 However, high concentrations of hexavalent chromium (VI) ion is toxic to the human body, as it can diffuse as Cr2O7 2-or HCr2O7 -through cell membranes and oxidize biological molecules. 22 Thus, selective treatment of pollutional water containing Cr (VI) prior to discharge is essential. The dichromate (Cr2O4 2-and HCr2O7 -) ions are anions with oxide functionalities at their periphery.…”

The first study about the relationship between the extractability of thiacalix[4]arene derivatives and the position of the coordination binding sites

“…17 In other words, 3 showed a high extractability with dichromate anions only at lower pH, but another high extractability of Cr 3+ at higher pH. Since, Cr(VI) is highly toxic, carcinogenic and harmful to human beings because it can diffuse as Cr 2 O 7 2− or HCr 2 O 7 − through cell membranes and oxidize biological molecules, 7 whereas Cr(III) is an essential ion for mammals as it maintains effective glucose, lipid, and protein metabolisms. 18 Thus, 3 could be a meaningful extractant when applying a solvent extraction method for the selective treatment of waste water containing Cr(VI) and Cr(III) prior to discharge.…”