Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C

Zhu, Yinian; Nong, Peijie; Mo, Nan; Zhu, Zongqiang; Deng, Huan; Tang, Shen; Yang, Hongqu; Zhang, Lihao; Wang, Xingxing

doi:10.1186/s12932-021-00075-1

Geochemical Transactions

Table 4 Analytical data and solubility of the (Ca_1-xMn_x)CO₃ solid solutions in CO₂-saturated water at 25 °C

From: Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca_1-xMn_x)CO₃] at 25 °C

Sample	Dissolution time (h)	pH	Concentration (mmol/L)			log_IAP^c	Average log_IAP	ΔG_f° (kJ/mol)	Average ΔG_f° (kJ/mol)
Sample	Dissolution time (h)	pH	Ca	Mn	HCO₃ + CO₃	log_IAP^c	Average log_IAP	ΔG_f° (kJ/mol)	Average ΔG_f° (kJ/mol)
(Ca_1.00Mn_0.00)CO₃	2400	8.00	0.7096	0.0000	1.3379	− 8.51	− 8.59	− 1130.00	− 1130.48
	4800	7.92	0.6304	0.0000	1.1650	− 8.69	± 0.10	− 1131.05	± 0.57
	7200	8.04	0.6315	0.0000	1.1547	− 8.57		− 1130.38
(Ca_0.89Mn_0.11)CO₃^a	2400	8.13	0.7705	0.0030	1.4653	− 8.60	− 8.66	− 1094.57	− 1094.93
(Ca_0.88Mn_0.12)CO₃^b	4800	8.14	0.6686	0.0032	1.2606	− 8.69	± 0.06	− 1095.12	± 0.36
	7200	8.16	0.6512	0.0033	1.2451	− 8.69		− 1095.09
(Ca_0.78Mn_0.22)CO₃^a	2400	8.11	0.7954	0.0039	1.5584	− 8.85	− 8.92	− 1060.05	− 1060.50
(Ca_0.76Mn_0.24)CO₃^b	4800	8.11	0.6830	0.0039	1.3393	− 8.95	± 0.08	− 1060.66	± 0.45
	7200	8.12	0.6593	0.0038	1.2771	− 8.97		− 1060.79
(Ca_0.68Mn_0.32)CO₃^a	2400	8.06	0.8304	0.0054	1.5895	− 9.08	− 9.05	− 1028.73	− 1028.53
(Ca_0.65Mn_0.35)CO₃^b	4800	8.09	0.8764	0.0046	1.6778	− 9.04	± 0.03	− 1028.49	± 0.20
	7200	8.05	0.9419	0.0048	1.8336	− 9.02		− 1028.38
(Ca_0.58Mn_0.42)CO₃^a	2400	8.06	0.9222	0.0057	1.7134	− 9.24	− 9.23	− 997.07	− 997.03
(Ca_0.55Mn_0.45)CO₃^b	4800	8.06	0.9464	0.0054	1.7810	− 9.23	± 0.01	− 997.00	± 0.04
	7200	8.01	1.0500	0.0052	1.9438	− 9.23		− 997.02
(Ca_0.47Mn_0.53)CO₃^a	2400	8.01	0.8893	0.0058	1.6451	− 9.55	− 9.47	− 963.04	− 962.60
(Ca_0.44Mn_0.56)CO₃^b	4800	8.01	1.0871	0.0069	2.0502	− 9.39	± 0.08	− 962.13	± 0.46
	7200	7.99	1.0713	0.0058	1.9531	− 9.48		− 962.61
(Ca_0.37Mn_0.63)CO₃^a	2400	7.98	1.2446	0.0101	1.6866	− 9.58	− 9.61	− 930.78	− 930.96
(Ca_0.35Mn_0.65)CO₃^b	4800	7.95	1.3037	0.0085	1.8842	− 9.61	± 0.03	− 930.94	± 0.19
	7200	7.99	1.1368	0.0070	1.8409	− 9.64		− 931.14
(Ca_0.28Mn_0.72)CO₃^a	2400	8.00	0.9182	0.0105	1.7070	− 9.77	− 9.82	− 902.46	− 902.74
(Ca_0.25Mn_0.75)CO₃^b	4800	8.02	0.8777	0.0084	1.6451	− 9.84	± 0.05	− 902.85	± 0.28
	7200	8.02	0.9792	0.0073	1.7481	− 9.85		− 902.92
(Ca_0.17Mn_0.83)CO₃^a	2400	7.81	0.9402	0.0105	1.7566	− 10.12	− 10.05	− 868.91	− 868.51
(Ca_0.16Mn_0.84)CO₃^b	4800	7.97	0.8331	0.0108	1.5837	− 10.00	± 0.07	− 868.19	± 0.40
	7200	8.01	0.8028	0.0091	1.4962	− 10.04		− 868.44
(Ca_0.08Mn_0.92)CO₃^a	2400	7.70	0.5699	0.0264	1.2909	− 10.16	− 10.24	− 839.86	− 840.32
(Ca_0.07Mn_0.93)CO₃^b	4800	7.71	0.6976	0.0196	1.4666	− 10.22	± 0.11	− 840.18	± 0.60
	7200	7.71	0.6368	0.0174	1.1982	− 10.35		− 840.93
(Ca_0.00Mn_1.00)CO₃	2400	7.25	0.0000	0.1717	0.5410	− 10.25	− 10.28	− 814.39	− 814.59
	4800	7.24	0.0000	0.1687	0.4840	− 10.31	± 0.03	− 814.76	± 0.20
	7200	7.29	0.0000	0.1633	0.4620	− 10.29		− 814.64

^aBulk composition before dissolution; ^bBulk composition after 300 d of dissolution;
^cIAP estimated for the bulk composition after 300 d of dissolution

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