Hostname: page-component-78c5997874-4rdpn Total loading time: 0 Render date: 2024-11-03T01:00:56.375Z Has data issue: false hasContentIssue false
  • English
  • Français

The solubility of calcium phosphates in citric acid

Published online by Cambridge University Press:  27 March 2009

A. A. Ramsay
A. A. Ramsay
Affiliation:
(Chemical Laboratory, Department of Agriculture, Sydney, N.S.W.)
Get access Rights & Permissions [Opens in a new window]

Extract

The results of these investigations show

1. The substances sold as “Phosphate of lime” and “Calcium Phosphas B.P.” are not pure tricalcic phosphate but are mixtures of di- and tricalcic phosphates.

2. Sodium phosphate (Na2HPO4) added to ammoniacal calcium chloride and the resulting precipitate washed with water yields a mixture of di- and tricalcic phosphate and calcium hydrate.

3. Bone ash dissolved in hydrochloric acid and precipitated with ammonia, the precipitate being well washed, yields also a mixture of di- and tricalcium phosphate and calcium hydrate.

4. When three equivalents of lime (3CaO) are made to act on one equivalent of phosphoric acid (P2O5) and the resulting precipitate removed with little delay pure tricalcium phosphate is obtained.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 8 , Issue 3 , June 1917 , pp. 277 - 298
Copyright
Copyright © Cambridge University Press 1917

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

page 277 note 1 Aikman, , Manures and Manuring, p. 391.Google Scholar

page 277 note 2 Thorpe, Dictionary of Applied Chemistry (latest edition), Vol. II, p. 549.Google Scholar

page 278 note 1 Wiley, , Principles and practice of Agricultural Analysis, Vol. I, p. 21.Google Scholar

page 278 note 2 Fresenius, , Quantitative Chemical Analysis, Vol. I, p. 188.Google Scholar

page 278 note 3 Crookes, , Select methods of Chemical Analysis, p. 499.Google Scholar

page 278 note 4 Fertilisers and Feeding Stuffs Regulations, 1908. Board of Agriculture. Fisheries Leaflet No. 18, p. 17.

page 281 note 1 Treatise on Chemistry, Vol. II, Part I, p. 205.Google Scholar

page 281 note 2 “On the decomposition of tricalcium phosphate by water,” Journal Chemical Society, Vol. XXVI (entire series), p. 983.Google Scholar

page 282 note 1 The British Pharmacopoeia (Spottiswoode and Co., London), 1891, p. 87.

page 288 note 1 Fertilisers and Feeding Stuffs Regulations, 1908. Board of Agriculture. Fisheries Leaflet 18, p. 17.

page 293 note 1 Newth, , Maraud of Chemical Analysis, p. 64.Google Scholar

page 296 note 1 Warington, R., “On the decomposition of Tricalcic Phosphate by Water,” Journal Chemical Society (Entire Series), Vol. XXVI, p. 983.Google Scholar