The Determination of Inorganic Sulphate in Sodium Lauryl Sulphate
The official method for the determination of inorganic sulphate in sodium lauryl sulphate is time‐consuming. Separation of organic and inorganic sulphate via the lead salts followed by complexometry leads to a rapid and convenient method with readily reproducible results.
Complexometric Determination of Sulfate
A simple and rapid method for the determination of sulfate in materials obtained during extraction of uranium from ores is based on precipitation as lead sulfate from acid solution containing isopropyl alcohol. The precipitate is filtered and redissolved in an excess of measured standard (ethylenedinitrilo)tetraacetic acid (EDTA) solution. The excess of the latter is then backtitrated with a standard zinc chioride solution and Eriochrome Black T as indicator. A detailed study of the optimum conditions for the precipitation of lead suifate has been carried out, and the degrees of interference of phosphate, arsenate, iron, and uranium ions have been tested. The method is virtually free of interferences and gives accurate results in the range 0.1 to 100% sulfates the time required for a determination is about 30 to 45 minutes. (auth)
The use of benzidine dihydrochloride for sulfate determinations
Abstract It has been shown by electron micrographs that the incomplete precipitation of benzidine sulfate in the presence of foreign ions is due, in part at least, to the prevention of proper crystal formation and growth. The diverse ion effect upon solubility may also play some role in previously reported studies. A possible explanation of the observed phenomena has been suggested upon the basis of adsorption effects and the PANETH-FAJANS-HAHN law.