Chemical Stability and Compatibility - Standards and digestions for perovskite oxides (BaLaSnO3)

Regarding the mixing of standards, many ICP calibration standards can be mixed together at working levels (<10 ppm) even though certain elements and matrices are incompatible at higher concentrations. Concentrations of approximately 10 ppm (or lower) of Ba, La, and Sn should be stable in dilute HNO3 (2-7% v/v) with trace amounts of fluoride present (~0.1% v/v or less), with the greatest concern being the relative levels of La and HF. Resources on our website such as the Interactive Periodic Table (http://inorganicventures.com/periodic-table) can offer more information regarding specific elements and matrices. As for Sn specifically, it is stable in a HCl matrix, and as this chemistry is commercially available (we offer a 1000 ug/mL Sn in HCl stock standard; CGSNCL1) it might offer a suitable alternative that would allow you to avoid HF. With respect to dissolving BaSnO3, one consideration would be the capabilities of your lab, and if high temperature/high pressure digestion methods and/or fusions are possible. Is it correct to assume the BaSnO3 is a material with a perovskite structure? If so, refractory oxides such as these frequently require fusions, and one reported method for digesting the mineral perovskite (CaTiO3) is a fusion with borax (Na2B4O7), which should also be suitable for the BaSnO3.