arthur kierski
Well-known member
what metals in solution can distort(gives false results) with a stanous chloride test?
distortions
- Thread starter arthur kierski
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NoIdea
Well-known member
Geo
Well-known member
copper can give a false positive for gold, the stain is brown too an excess of nitric acid can cause a false positive for gold. use the search box and type "stannous false positive".
arthur kierski
Well-known member
palladium ;i am testing for gold ----sometimes it gives a test results with gold but the brown precipitate obtained with smb is magnetic and the gold is really a small quantity in comparison with the brown( iron?)precipitate
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=37&t=10869&p=109413&hilit=plastic+spoon#p109413
Have you tried percipatating with ferrous sulfate to see if that might make a difference?
From Harold
That's entirely possible when working with a solution that contains a serious amount of gold, but you can do a test with ferrous sulfate to eliminate the gold, then test the solution for values if there's any question about content. Here's what you do: Place a drop of your solution in a spot plate cavity, then apply a crystal of ferrous sulfate. The crystal will precipitate the gold as a very thin sheet, or fine powder, leaving behind any other values. You can then test the cavity with stannous chloride to see if there is any reaction. If you get a purple reaction, you know the gold is not yet all down. If so, start another test, and stir the tiny sample with a glass rod, exposing all of it to the ferrous sulfate. The sample will change color as the gold precipitates. It's a good idea to have a tiny amount of ferrous sulfate left, which will indicate that the gold is all down. When there is no further action or color change, apply a drop of stannous chloride. With the gold gone from the solution, you can now see if there are other values present.
Have you tried percipatating with ferrous sulfate to see if that might make a difference?
From Harold
That's entirely possible when working with a solution that contains a serious amount of gold, but you can do a test with ferrous sulfate to eliminate the gold, then test the solution for values if there's any question about content. Here's what you do: Place a drop of your solution in a spot plate cavity, then apply a crystal of ferrous sulfate. The crystal will precipitate the gold as a very thin sheet, or fine powder, leaving behind any other values. You can then test the cavity with stannous chloride to see if there is any reaction. If you get a purple reaction, you know the gold is not yet all down. If so, start another test, and stir the tiny sample with a glass rod, exposing all of it to the ferrous sulfate. The sample will change color as the gold precipitates. It's a good idea to have a tiny amount of ferrous sulfate left, which will indicate that the gold is all down. When there is no further action or color change, apply a drop of stannous chloride. With the gold gone from the solution, you can now see if there are other values present.
