Sample Preparation - Dissolving Rh with Sodium Perchlorate
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Brian Alexander, PhD
Total posts: 18
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The literature sources generally stem from work reported in the Journal of Research of the National Bureau of Standards (Vol. 33, Research Paper RP1614 (1944)), and also summarized in The Analytical Chemistry of the Noble Metals by F. E. Beamish (1966). The HCl and sodium perchlorate approach permits some latitude regarding reagent amounts, and generally speaking 1 gram of metal requires 10-20 mL of concentrated HCl and 0.4 - 0.8 grams of sodium perchlorate (higher amounts for lower atomic weight metals, e.g., rhodium). Note that these literature methods suggest sealed glass tubes for carrying out the reaction as chlorine is produced, and it's not clear if an open container digestion would be suitable or appropriate. |