Iron Standard Solution (20 ppm Fe)
Immediately before use, dilute with water R to 10 times its volume a solution containing ferric ammonium sulfate R equivalent to 0.863 g of FeNH4(SO4)2,12H2O and 25 mL of dilute sulfuric acid R in 500.0 mL.
Immediately before use, dilute with water R to 10 times its volume a solution containing ferric ammonium sulfate R equivalent to 0.863 g of FeNH4(SO4)2,12H2O and 25 mL of dilute sulfuric acid R in 500.0 mL.