Phosphate Buffered Saline 10X pH 7.2 with Azide (0.2 M Potassium Phosphate 1.5 M Sodium Chloride 0.1% (w/v) Sodium Azide) is a concentrated stock solution and should be diluted appropriately with distilled, deionized water or equivalent to its final working concentration. 10X PBS pH 7.2 with Azide is meticulously prepared using ultra pure reagents dissolved in highly polished pharmaceutical grade deionized water.