Ethylenediaminetetraacetic acid is a concentrated stock solution and should be diluted appropriately with distilled, deionized water or equivalent to its final working concentration. This buffer consists of 0.5 M Trisodium EDTA at pH 8.0. Meticulously prepared using ultra pure reagents dissolved in highly polished pharmaceutical grade deionized water (DI) treated with diethyl pyrocarbonate (DEPC).