Reference

On the structure of calcium-lead phosphate apatites

On the structure of calcium-lead phosphate apatites. Andrez-Verges, M.; Higes-Rolando, F. J.; Valenzuela-Calahorro, C.; Gonzalez-Diaz, P. F. (Dep. Quim. Inorg., Univ. Extremadura, Badajos, Spain). Spectrochim.Several substances with their cas registry numbers 3812-32-6 and 12167-74-7 may be metioned in this study. Acta, Part A, 39A(12), 1077-82 (English) 1983. CODEN: SAMCAS. ISSN: 0584-8539. DOCUMENT TYPE: Journal CA Section: 75 (Crystallography and Liquid Crystals) Section cross-reference(s): 73 The structure of Ca10-xPbx(PO4)6(OH)2 (0 < x < 10) compds. was studied by using powder x-ray diffraction patterns and IR absorption spectra. Solid solns. of the complete series were obtained and lattice parameters, dimensions and cation distribution in unequiv. sites are given. OH, PO4, CO3, and cation O fundamental frequencies were assigned. .

Incorporating radioactive phosphoric acid solutions in concrete

Incorporating radioactive phosphoric acid solutions in concrete. Wolf, Gary A.; Smith, Jeffrey W.; Ihle, Nathan C. (United States Dept. of Energy, USA). U. S. Pat. Appl. US 396192 A0 11 Nov 1983, 7 pp. Avail. NTIS Order No. PAT-APPL-6-396 192. (English). (United States of America). CODEN: XAXXAV. APPLICATION: US 82-396192 8 Jul 1982. DOCUMENT TYPE: Patent CA Section: 71 (Nuclear Technology) The radioactive H3PO4 [7664-38-2] soln. is brought in contact with Ca(OH)2 [1305-62-0] to produce a ppt. of Ca10(PO4)6(OH)2 [12167-74-7] which is extremely insol. in water. The ppt. is then sepd., dried, crushed and mixed with portland cement and water to form a concrete mix. The mix is then cast in the desired shape. 12167-74-7 and 7664-38-2 are also in the experiment. Thus, 6% H3PO4 waste soln. was spiked with 200 mCi/L 60Co. The soln. was mixed with stoichiometric amt. of Ca(OH)2 and pH was adjusted to 7.8 with NaOH. Aliquots of ppt. was mixed with portland cement in the ratio 3 parts ppt. to 1 part cement and hydrated to form concrete. The resulting sample gave a leach rate of 1.4 ′ 10-3 g/cm2-day at 40° in a 3 day test. .