フエロインによるエロフロートの比色定量法
硫化鉱物に対するエロフロート吸着量測定法
1974 年 90 巻 1039 号 p. 607-610
詳細
1974 年 90 巻 1039 号 p. 607-610
The spectrophotometric determination of Aerofloat with ferroin has been investigated to determine the amounts of Aerofloat adsorbed on sulfide minerals.
Aerofloat is extracted from aqueous solution into nitrobenzene as ion pairs of Aerofloat and ferroin.
The absorbance of extract has a maximum at 514nm.and does not vary within an hour.The calibration curve obeys Beer's law.
The absorbance is constant in the pH range 2 to 10 and it is affected by the presence of monovalent anions of relatively large steric structure, such as NO-3and ClO-ions, but is not by the presence of divalent anions, subh as SO42-, CO32-and S2-, which are often contained in flotation pulp of sulfid oees.
Therefore, the amounts of Aerofloat adsorbed on galena or chalcopyrite surface are easily determined from the difference between initial and equilibrium concentrations.But, when the decomposition of Aerofloat occurs in course of adsorption process, the amounts of adsorption can not be determined by this method.In this case, it can be estimated from the amounts of Aerofloat desorbed from sulfide mineral surface by treatment with sodium sulfide solution, because Aerofloat adsorbed on the surface is entirely desorbed by sodium sulfide.
