So, Thursday arvo I managed to finally test my theory on the anomalous backgrounds that I was whinging about here. I did an excellent job of disproving my hypothesis. Trace HF in a solution ICP-MS does not remobilize HFS elements from laser ablation. The great thing about proving myself wrong in this case is that it means that I don’t need to worry about rejuggling the schedule. There is no point trying to shuffle people around to avoid a problem that doesn’t actually exist.