Carrier Precipitation of Trace Elements with Hydrated Manganese Dioxide

Abstract

A study is described for the carrier precipitation of μg quantities of inorganic elements with hydrated manganese dioxide from nitric acid solution using radioactive tracers. It is found that trace elements were classified in 5 groups, i.e., W (VI) andAs (V) -collected completely from 0.01 to 6 N-, Ir (VI) andSb (V) -collected completely from 0.01 to 1 N decreasing their recovery gradually with the elevation of acidity-, Fe (III) andIn (III) -collected completely from 0.01 to 1 N decreasing their recovery drastically with the elevation of acidity-, Co (II), Cu (II) andZn (II) -collected above pH 4.0 decreasing their recovery abruptly at lower pH, and below pH 1 no entrainment occurred-and monovalent alkaline metal ions-no entrainment occurred from any solution-.
The effects of the presence of competitive ions and complexing reagents were investigated and discussion was given to the results.