Jorpho wrote:So is the Pt used for its high melting temperature or something? Normally I would associate its use with some sort of catalysis.TychoMaudd wrote:They generally get used for USP/NF ID test for silicon dioxide. It involves heating the sample and potassium carbonate in a Pt crucible until they melt together, then adding in 2 mL of a colorimetric test reagent once it cools. Seeing how expensive they are, we get the smallest ones that are suitable. A larger, more normal sized crucible would be upwards of $5000.Jorpho wrote:A whole crucible? What do you do with them?TychoMaudd wrote:We've got Pt crucibles no bigger than a thimble that cost over $1000 each.A fire extinguisher can be just as bad when it comes to flammable metals, depending on the extinguisher. A special Class D unit is sometimes called for.TychoMaudd wrote:Thankfully at least some of the students knew what to do and how to use a fire extinguisher.
I assume it's because of the melting point, the fact it doesn't oxidize easily and it's high heat conductance but low heat capacity (it'll be heated up to the point that it'll glow red/orange, but cool off to room temp in about a min or two). In any case, the test specifically calls for Pt, so that is what needs to be used in order to conform to USP standards.