The Ricca Chemicals mixed calibration standard with a composition of 96.99% water, 1.99% nitric acid, 0.97% Iron,<0.1 % barium nitrate, <0.1% vanadium, <0.1% copper, <0.1% cobalt, is suitable for use in laboratory use only. it can be stored at a temperature of 15 to 30 degree c.<>0.1>