Manganese solvent extraction procedure

Flynn [72] has described a solvent extraction procedure for the determination of 54manganese in seawater in which the sample with bismuth, cerium, and chromium carriers, is extracted with a heptane solution of bis(2-ethylhexyl) phosphate and the manganese back-extracted with 1M hydrochloric acid. After... 

Samples were purified before activation using the solvent extraction procedure of Hahn et al. (22) with thenoyltrifluoroacetone as the ligand. An activation routine was developed to avoid subsequent contamination with aluminum, to allow the excape of Ar, to monitor flux variations, and to facilitate spectrum stripping of residues of manganese, aluminum, and sodltun (15). The advent of high efficiency germanium detectors has significantly reduced the... 

Determination of manganese in urine can be made by flame AAS after extraction into an organic solvent (Van Ormer and Purdy 1973) and after ion-exchange separation (Pan-tucek, 1981). Solvent extraction procedures have also been described for GF-AAS (Buchet et al.. 1976 Watanabe et al., 1978). As the direct determination of manganese in... 

Statham [448] has optimised a procedure based on chelation with ammonium dithiocarbamate and diethylammonium diethyldithiocarbamate for the preconcentration and separation of dissolved manganese from seawater prior to determination by graphite furnace atomic absorption spectrometry. Freon TF was chosen as solvent because it appears to be much less toxic than other commonly used chlorinated solvents, it is virtually odourless, has a very low solubility in seawater, gives a rapid and complete phase separation, and is readily purified. The concentrations of analyte in the back-extracts are determined by graphite furnace atomic absorption spectrometry. This procedure concentrates the trace metals in the seawater by a factor of 67.3. 

---