A complete aqueous method for trace level extraction and spectrophotometric estimation of Bi(III/V) salts

作者：Paik Sankar Prasad; Ghatak Sumanta Kumar; Sen Kamalika^*

来源：Journal of the Indian Chemical Society, 2012, 89(11): 1465-1470.

• Aqueous biphasic system
• Bi(III/V) extraction
• polyethylene glycol (PEG)
• APDC

The extraction and spectrophotometric estimation of Bi(III) and Bi(V) salts were studied in an aqueous polyethylene glycol (PEG) based biphasic system. Na2SO4 and MgSO4 salt rich phases were applied against 50% PEG solutions to obtain the two phase system. The chelating ligand, ammonium pyrrolidine dithiocarbamate (APDC) was used to form a complex with B(III) and Bi(V). The complex is found to dissolve in the aqueous solution of polyethylene glycol which can be utilized for the spectrophotometric determination of Bi even at trace level concentrations (similar to 30 mg/L). The yellow colored Bi-APDC solution in PEG shows a wavelength of maximum absorption at 360 nm. Variation of pH of the salt solution in the acidic range did not affect the extraction efficiency much. Bi can be stripped back in the salt rich phase by addition of very dilute alkali that breaks the complex with APDC.

• 出版日期2012-11