All,
Here is part 3 of the testing procedures for combined precious metals:
Test 3:
For this test you will need:
Here's what to do:
Here is part 3 of the testing procedures for combined precious metals:
Test 3:
For this test you will need:
- Sodium Peroxide (Na2O2)
- Ammonium Hydroxide (NH4OH)
- Hydrochloric Acid (HCl)
- Ammonium Nitrate (NH4NO3)
- Metalllic Zinc (Zn)
- Ethanol (ethyl alcohol = CH3CH2OH)
- Distilled Water
Here's what to do:
- Evenly mix test material 1 part to 4 parts sodium peroxide in an iron crucible.
- Fuse the mix for a minimum of 40 minutes.
- Dissolve cooled material into distilled water.
- Pour off a quarter of the solution and add it to a small portion of ethyl alcohol and HCl.
- Boil the solution
- Add some ammonium hydroxide.
- Results 1:
- Osium will drop as a reddish-brown powder.
- Results 1:
- Add a quarter of the solution from step 3 above to a saturated solution of ammonium nitrate (190 gm per 100 mL @20 C).
- Results 2:
- Gold will precipitate as native gold.
- Rhodium will form an orange-yellow precipitate soluble in HCl.
- Upon boiling Iridium slowly drops as a yellow precipitate.
- Gold will precipitate as native gold.
- Results 2:
- Add a quarter of the solution from step 3 above to a 1:1 mix of HCl and water.
- Add ammonium chloride.
- Results 3:
- Platinum will drop as yellow cubes.
- Palladium will precipitate as red-brown or olive-green precipitate.
- Platinum will drop as yellow cubes.
- Results 3:
- Add zinc to the last quarter of the solution from step 3 above.
- Results 4:
- Ruthenium's presence is indicated by a color change of blue then colorless, followed by a gray metallic precipitate.
- Results 4:
