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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 15

13

Class. II. 

1. Sodium thio-sulphate method (7)
In this method the solution of iron and aluminium salts is boiled with an excess of sodium thio-sulphate until there are no more fumes of sulphur dioxide given off. This usually take[s] about four hours of boiling. The evaporated water is not replaced. After the sulphur dioxide is given off potassium hydrate is added and the solution boiled and the ferrous sulphide filtered + washed. The iron is determined in one of several ways. 
In the filtrate the aluminium is deterrmined by adding hydrochloric acid enough to dissolve the precipitate that forms and their [ammonia?]. The aluminium is weighed as the oxide. 
This method has the disadvantage [of?] long continued boiling. The volumetric method would perhaps be the best for the determination of the iron. If it is reduced by hydrogen there is opportunity for loss. The sulphide way, however, be dissolved in hydrochloric acid (dilute) and precipitated by ammonia and weighed as the oxide.

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13 Class. II. 1. Sodium thio-sulphate method (7) In this method the solution of iron and aluminium salts is boiled with an excess of sodium thio-sulphate until there are no more fumes of sulphur dioxide given off. This usually take[s] about four hours of boiling. The evaporated water is not replaced. After the sulphur dioxide is given off potassium hydrate is added and the solution boiled and the ferrous sulphide filtered + washed. The iron is determined in one of several ways. In the filtrate the aluminium is deterrmined by adding hydrochloric acid enough to dissolve the precipitate that forms and their [ammonia?]. The aluminium is weighed as the oxide. This method has the disadvantage [of?] long continued boiling. The volumetric method would perhaps be the best for the determination of the iron. If it is reduced by hydrogen there is opportunity for loss. The sulphide way, however, be dissolved in hydrochloric acid (dilute) and precipitated by ammonia and weighed as the oxide.