An Introduction to the Chemistry of Radioactive Substances
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This is possible because it has a long half-value period and consequently exists in weigh- able quantity.
(c) Extraction. Protactinium has been removed from pitchblende residues in the following manner. The residues are boiled for a long time with nitric acid. Most of the radio-active constituents present, including radium, go into solution. A little tantalum oxide and a few milligrams of thorium and lead nitrates are then added to the residue, and the whole extracted with hydrofluoric and sulp...huric acids. The tantalum and protactinium go into solution ; the thorium and lead, and with them UX^ lo, and RaD, remain insoluble. The solution is evaporated to dryness and ignited, and compounds of iron, zirconium, etc. , may be removed from the insoluble tantalum and protactinium by boiling with aqua regia. So far tantalum and pro- tactinium have not been separated.
(d) Chemical properties. Nothing is definitely known at present about its chemical properties, except that it resembles tantalum, of which it is evidently the homo- logue.
What to read after An Introduction to the Chemistry of Radioactive Substances?
You can find similar books in the "Read Also" column, or choose other free books by Alexander S Alexander Smith Russell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This is possible because it has a long half-value period and consequently exists in weigh- able quantity.
(c) Extraction. Protactinium has been removed from pitchblende residues in the following manner. The residues are boiled for a long time with nitric acid. Most of the radio-active constituents present, including radium, go into solution. A little tantalum oxide and a few milligrams of thorium and lead nitrates are then added to the residue, and the whole extracted with hydrofluoric and sulp...huric acids. The tantalum and protactinium go into solution ; the thorium and lead, and with them UX^ lo, and RaD, remain insoluble. The solution is evaporated to dryness and ignited, and compounds of iron, zirconium, etc. , may be removed from the insoluble tantalum and protactinium by boiling with aqua regia. So far tantalum and pro- tactinium have not been separated.
(d) Chemical properties. Nothing is definitely known at present about its chemical properties, except that it resembles tantalum, of which it is evidently the homo- logue.
What to read after An Introduction to the Chemistry of Radioactive Substances?
You can find similar books in the "Read Also" column, or choose other free books by Alexander S Alexander Smith Russell to read onlineMoreLess
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