Potentiometric determination of sodium hydrogen sulfite with lead tetraacetate

Lithium interference with potentiometric sodium determination.

Direct potentiometric determination of sodium ion in blood. I. Potentiometric response in simple sodium chloride solutions.

We measured the emf of NaCl solutions (120-160 mmol/L) with a home-built cell in steady-state and with some commercial direct potentiometric analyzers about 20 s after the sample is introduced into the instrument. We compared the results with the theoretical sodium ion activity calculated according to different thermodynamic theories. The slope of the calibration graph was calculated with and w...

Potentiometric Determination of Coextraction Constants

1 A theoretical treatment of potentiometric data is applied to calculate coextraction 2 constants (K IA) for three potassium salts from water into a liquid nitrobenzene phase. 3 The experiment involves treating nitrobenzene as a membrane and contacting it with 4 two aqueous solutions of different ion activities. In the presence of either a cation or 5 anion exchanger, the ratio of activities of...

Enantioselective aziridination of alkenes with N-aminophthalimide in the presence of lead tetraacetate-mediated chiral ligand.

[reaction: see text] Reaction of various N-enoyl oxazolidinones 5a-f with N-aminophthalimide and lead tetraacetate in the presence of camphor-derived chiral ligands provides the desired N-phthalimidoaziridines 6a-f in good to high enantiomeric excess (67-95% ee) at 0 degrees C within 15 min. The absolute stereochemistry of the corresponding aziridine derivatives was established by chemical corr...

Anti-candida activity of sodium sulfite.

The growth of Candida albicans in RPMI1640 medium was inhibited by sodium sulfite between pH 3-6. Under the condition of pH 7, growth of C. albicans was not inhibited by sodium sulfite. Under an acidic pH condition, sodium sulfite had a candidacidal effect and the activity was expressed within 150 min. The concentration of ATP in C. albicans was decreased by sodium sulfite. Ethanol production b...