Characterization, dissolution and solubility of the hydroxypyromorphite–hydroxyapatite solid solution [(PbxCa1−x)5(PO4)3OH] at 25 °C and pH 2–9

Zhu, Yinian; Huang, Bin; Zhu, Zongqiang; Liu, Huili; Huang, Yanhua; Zhao, Xin; Liang, Meina

doi:10.1186/s12932-016-0034-8

Tables 2 Analytical data and solubility determination of the hydroxypyromorphite–hydroxyapatite solid solution [(Pb_xCa_1‒x)₅(PO₄)₃OH] (25 °C and an initial pH of 2.00)

From: Characterization, dissolution and solubility of the hydroxypyromorphite–hydroxyapatite solid solution [(Pb_xCa_1−x)₅(PO₄)₃OH] at 25 °C and pH 2–9

Sample	Dissolution time (h)	pH	Concentration (mmol/L)			logK _sp	Average logK _sp	ΔG ^o_f (kJ/mol)	Average ΔG ^o_f (kJ/mol)
Sample	Dissolution time (h)	pH	Pb	Ca	P	logK _sp	Average logK _sp	ΔG ^o_f (kJ/mol)	Average ΔG ^o_f (kJ/mol)
(Pb_0.00Ca_1.00)₅(PO₄)₃OH	5040	4.75	0.00000	8.03	5.57	−58.46	−58.38	−6315.06	−6314.63
	5760	4.77	0.00000	8.03	5.59	−58.31		−6314.21
	7200	4.76	0.00000	8.04	5.58	−58.38		−6314.61
(Pb_0.10Ca_0.90)₅(PO₄)₃OH	5040	4.55	0.00099	7.12	3.91	−62.39	−62.39	−6128.29	−6128.28
	5760	4.54	0.00111	7.14	3.95	−62.41		−6128.42
	7200	4.55	0.00106	7.13	3.93	−62.36		−6128.12
(Pb_0.20Ca_0.80)₅(PO₄)₃OH	5040	4.46	0.00153	6.85	3.33	−64.99	−65.19	−5850.90	−5852.04
	5760	4.39	0.00172	6.85	3.36	−65.42		−5853.34
	7200	4.44	0.00153	6.67	3.32	−65.16		−5851.87
(Pb_0.30Ca_0.70)₅(PO₄)₃OH	5040	4.36	0.00149	6.61	3.30	−67.59	−67.43	−5601.14	−5600.22
	5760	4.39	0.00171	6.62	3.32	−67.27		−5599.35
	7200	4.37	0.00170	6.60	3.31	−67.42		−5600.17
(Pb_0.41Ca_0.59)₅(PO₄)₃OH	5040	4.45	0.00152	6.60	2.98	−69.07	−69.18	−5318.58	−5319.18
	5760	4.43	0.00151	6.60	3.02	−69.19		−5319.28
	7200	4.42	0.00152	6.61	3.00	−69.27		−5319.69
(Pb_0.51Ca_0.49)₅(PO₄)₃OH	5040	4.43	0.00211	6.07	1.79	−71.35	−71.42	−5039.35	−5039.76
	5760	4.42	0.00215	6.07	1.79	−71.40		−5039.60
	7200	4.40	0.00215	6.07	1.81	−71.52		−5040.33
(Pb_0.61Ca_0.39)₅(PO₄)₃OH	5040	4.32	0.00386	5.45	1.01	−73.84	−73.86	−4816.62	−4816.77
	5760	4.34	0.00401	5.39	1.01	−73.64		−4815.53
	7200	4.28	0.00391	5.38	1.00	−74.10		−4818.15
(Pb_0.69Ca_0.31)₅(PO₄)₃OH	5040	4.30	0.00224	6.18	2.24	−75.01	−74.94	−4528.61	−4528.24
	5760	4.33	0.00230	6.17	2.28	−74.73		−4527.06
	7200	4.28	0.00231	6.16	2.26	−75.08		−4529.04
(Pb_0.80Ca_0.20)₅(PO₄)₃OH	5040	4.12	0.00495	5.85	1.38	−77.40	−77.52	−4334.29	−4334.94
	5760	4.11	0.00468	5.89	1.40	−77.55		−4335.13
	7200	4.09	0.00487	5.85	1.42	−77.59		−4335.39
(Pb_0.89Ca_0.11)₅(PO₄)₃OH	5040	3.41	0.11486	5.11	0.101	−81.11	−81.16	−4061.97	−4062.27
	5760	3.35	0.11197	5.00	0.107	−81.49		−4064.16
	7200	3.36	0.13127	5.06	0.128	−80.88		−4060.67
(Pb_1.00Ca_0.00)₅(PO₄)₃OH	5040	2.63	3.75579	0.00	0.049	−80.96	−80.77	−3797.78	−3796.71
	5760	2.67	3.64382	0.00	0.046	−80.79		−3796.79
	7200	2.68	3.70270	0.00	0.050	−80.57		−3795.55

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