Nitrite reagent for dissolved cobalt analyses
Add 12.9 g of sodium nitrite per 125 mL of Milli - Q , by weighing the sodium nitrite directly into a large trace metal clean bottle .
Add 125 mL of Milli - Q to the bottle by weight .
Add clean Chelex - 100 resin to the bottle and place it on a shaker overnight to ensure the Chelex mixes throughout the solution .
The following morning , slowly pour the solution through an HPLC column with a frit in order to filter the chelex and allow the solution to pass into a trace metal clean bottle .
Make sure to test the reagent before use to ensure it is clean .
