An attempt was made to increase the solubility of High Level liquid Waste (HLW), mainly Cr and Mo, by addition of   P₂O₅ to sodium borosilicate glass. A total of seven different phosphorus containing alkali borosilicate  glass samples were  inhouse   fabricated. As a part of chemical quality control, concentrations of four low Z elements namely Si, Na, B and P were   determined by in situ current normalized external (in air) Particle  duced Gamma-ray Emission (PIGE) method using low   energy proton beam from Folded Tandem Ion Accelerator (FOTIA), BARC. PIGE method was validated by analyzing synthetic  elemental standards and suitable certified reference materials. Phosphorus has shown thermal losses during fabrication.