Frequently Asked Questions - How many mL of 1ppm gold (AuCl3) should I add to stablize Hg

We have limited data regarding the use of Au to stabilize Hg at ‘low’ concentrations, but we have studied 10, 50, and 100 ppb solutions of Hg in a matrix of 2% (v/v) HNO3 with 1 ppm of Au (as AuCl3) added as a stabilizer. These three Hg solutions were stored in acid-leached LDPE bottles, and for each solution Hg was stable for at least 3 years. Based upon these data, and considering your expected Hg concentrations of ≤20 ppb, we believe that a 1 ppm Au spike should be sufficient to stabilize Hg if the matrix is HNO3 and the preparation/storage containers are clean polyethylene. What we do not know is how your microwave digestion method may affect Hg stability, or if Au would be a suitable option for stabilization as part of the digestion process. If you could provide details of the digestion method (sample type, acids used, etc.) we may be able to offer additional suggestions or information.
Posted: 08/30/18 21:04:35