We are analyzing some samples of pharmaceutical industry. We are having bad recoveries in the analysis of osmium. After searching the possible problem, we have reach the conclusion that when we digest the sample the osmium reacts in the oxidizing media giving OsO4(g). In the literature are given some possible solutions to this problem. Stabilizing the osmium with a solution of ascorbic acid or cysteine.
Does anyone use this to stabilize osmium? Wich concentration of ascorbic acir or cysteine should we use?
Do you know any other possible solution to this problem?
Thank you in advance.