A progressing procedure is offered for determining of Gallium at low levels in two geological samples using High
Performance Ion Chromatography technique (HPIC). At the optimum operating conditions determined experimentally,
isocratic elution of gallium was 8mM pyridine-(2,6)-dicarboxylic acid eluent concentration (PDCA) at pH of 4 and flow rate
of 0.7mL/min. Two granite geological samples from Gabal Gatter and Gabal El Sela-Qash Amer area have been applied for
direct determination of gallium by applying the modified method. The method permits the evaluation of gallium without an
external preconcentration or complexing agents.