Abstract
Fundamental condition on isolation and determination of microamounts of gallium and germanium in iron and steel was carried out by means of quarternary ammonium salts and spectrophotometric methods.
The procedure constitutes the preliminary separation of gallium and germanium from acid solution, addition of organic reagent, such as 4-(2-pyridilazo)-resorcine (PAR) or phenylfluorone, formation of complexes with quarternary ammonium salts to improve the color sensitivity.
In gallium determination, the authors found that the water soluble gallium-PAR complex formed the ion-pair, which was extracted by chloroform, with zephiramine.
The maxinum absorbance of the gallium-PAR-zephiramine complex in chloroform was at 513nm, and its molar extinction cofficient of the reaction was 1.07×105, and then 0.0003×0.05% of gallium in iron and steel could be determined in optimum condition.
In germanium determination, the method by using cethyl trimethyl ammonium chloride (CTMAC) to germanium-phenylfluorone-complex was applied. The result showed that the germanium-phenylfluorone -CTMAC ratio was 1: 2: 2, and that 0.000×0.05% of germanium in iron and steel could be determination in optimum condition.
