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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 9

7

sulphuric acid.The precipitate of barium sulphate, should there be any, is filtered off and the iron determined in the filtrate in the usual way, volumetrically or by ammonia and weight as oxide. To the filtrate sulphuric acid is added until all the barium is separated and the solution filtered & the aluminium determined in the filtrate in the usual way.
The method was not described in detail but from its similarity to the other two this method of procedure was thought to be right. From its appearance the method would seem better than the first two but this is not the case. The action upon the glass is not as strong as either sodium or potassium but the precipitate obtained is worse than the precipitate obtained with the latter two. The separation of the barium is effected with difficulty as the precipitate is so fine and prone to run through the filter paper. This precipitate must be allowed to settle completely before it may be handled and so the time required is considerable. It is below

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7 sulphuric acid.The precipitate of barium sulphate, should there be any, is filtered off and the iron determined in the filtrate in the usual way, volumetrically or by ammonia and weight as oxide. To the filtrate sulphuric acid is added until all the barium is separated and the solution filtered & the aluminium determined in the filtrate in the usual way. The method was not described in detail but from its similarity to the other two this method of procedure was thought to be right. From its appearance the method would seem better than the first two but this is not the case. The action upon the glass is not as strong as either sodium or potassium but the precipitate obtained is worse than the precipitate obtained with the latter two. The separation of the barium is effected with difficulty as the precipitate is so fine and prone to run through the filter paper. This precipitate must be allowed to settle completely before it may be handled and so the time required is considerable. It is below