Abstract
Micro-determination of manganese in alkalichloride brine, industrial salt and caustic soda was tested by using Dowex A-1(Na form). After some fundamental studies on the titration curve for the resin (Fig. 2), on the optimum pH for adsorption (Fig. 3) and on the effects of salt concentration vs. adsorption (Fig. 4), an analytical procedure was carried out as follows:
The sample solution containing manganese was adjusted to pH 67, then 10 grams of the wet resin were added to it, and when the solution was subjected to agitation by batch process for one hour, the adsorption of manganese took place. Then, the resin was filtered off to separate it from large amounts of NaCl, and the resin was eluted with 12N H2SO4. The effluent was oxidized by heating with KIO4 as an oxidizing agent the resultant MnO4- was determined photometrically. Satisfactory results were obtained as indicated in Tables IV, V and VI.
