The Assay of Tin And Antimony
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The iodine solution is made up by dissolving 21. 32 grms. Iodine and 45 grms. Pure KI in about an inch of water in a small beaker and diluting to one litre. 100 c. C. = i grm. Sn. Not more than . 5 grm. Sn should be present in the assay. It has been proposed to increase the accuracy of this assay by titrating in an atmosphere of CO 3 .
Mr. A. H. Low states ("Technical Methods of Ore Analysis, " 2nd Edition, page 185) that copper and iron in contact precipitate tin. He does not, however, state t...he conditions which obtained when he made the observation, and the writer wishes to emphasise the fact that in a freely acid (HC1) solution (a sine qua non in tin assays), no such precipitation of tin ever takes place.
Titanium and tungsten both interfere with the ferric chloride and tungsten with the iodine titrations for tin, as titanium sesquichloride, TioCl 6, and the blue oxide of tungsten, WO 2, are peroxidised in HC1 solution by ferric chloride, and WO 2 by iodine. Titanium sesqui- chloride is not affected by iodine, and titanium does not interfere with the iodine titration.
What to read after The Assay of Tin And Antimony?
You can find similar books in the "Read Also" column, or choose other free books by L Laurent Parry to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The iodine solution is made up by dissolving 21. 32 grms. Iodine and 45 grms. Pure KI in about an inch of water in a small beaker and diluting to one litre. 100 c. C. = i grm. Sn. Not more than . 5 grm. Sn should be present in the assay. It has been proposed to increase the accuracy of this assay by titrating in an atmosphere of CO 3 .
Mr. A. H. Low states ("Technical Methods of Ore Analysis, " 2nd Edition, page 185) that copper and iron in contact precipitate tin. He does not, however, state t...he conditions which obtained when he made the observation, and the writer wishes to emphasise the fact that in a freely acid (HC1) solution (a sine qua non in tin assays), no such precipitation of tin ever takes place.
Titanium and tungsten both interfere with the ferric chloride and tungsten with the iodine titrations for tin, as titanium sesquichloride, TioCl 6, and the blue oxide of tungsten, WO 2, are peroxidised in HC1 solution by ferric chloride, and WO 2 by iodine. Titanium sesqui- chloride is not affected by iodine, and titanium does not interfere with the iodine titration.
What to read after The Assay of Tin And Antimony?
You can find similar books in the "Read Also" column, or choose other free books by L Laurent Parry to read onlineMoreLess
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