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The Analytical Separation of Iron and Aluminium by Henry Erdmann Radasch, 1897

The Analytical Separation of Iron and Aluminium by Henry Erdmann Radasch, 1897, Page 7

5.

be used is no doubt the chief objection. The silica thus dissolved appears with the [aluminium?] and is separated from the latter only with greatest difficulty. For the separation a nickel dish is used as neither glass nor porcelain will [answer?]. Nickel is even better than platinum. As the solution in boiling [spirts?] up the sides of the dish and dries precautions must be taken to avoid this. The action of the air upon the solution is to form the carbonate of aluminum which would be precipitated and appear with the iron and be a source of error. For both of these the best thing to be done is to keep this nickel dish well covered  during the whole operation. 
To prevent the action of the caustic alkali solution upon the filter flask the hydrochloric acid is placed in the latter and the filtrate of caustic aluminate is allowed to run into it and so the effect upon the glass prevented.
This method gives satisfaction if all the precautions are followed but missing of any is liable to cause errors in the results.

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5. be used is no doubt the chief objection. The silica thus dissolved appears with the [aluminium?] and is separated from the latter only with greatest difficulty. For the separation a nickel dish is used as neither glass nor porcelain will [answer?]. Nickel is even better than platinum. As the solution in boiling [spirts?] up the sides of the dish and dries precautions must be taken to avoid this. The action of the air upon the solution is to form the carbonate of aluminum which would be precipitated and appear with the iron and be a source of error. For both of these the best thing to be done is to keep this nickel dish well covered during the whole operation. To prevent the action of the caustic alkali solution upon the filter flask the hydrochloric acid is placed in the latter and the filtrate of caustic aluminate is allowed to run into it and so the effect upon the glass prevented. This method gives satisfaction if all the precautions are followed but missing of any is liable to cause errors in the results.