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 2 Analytical data and solubility of the (Ca_1-xMn_x)CO₃ solid solutions in air-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	8.21	0.6677	0.0000	1.2831	− 8.34	− 8.44	− 1129.04	− 1129.63
	4800	8.12	0.6330	0.0000	1.1790	− 8.48	± 0.10	− 1129.87	± 0.59
	7200	8.11	0.6323	0.0000	1.1507	− 8.50		− 1129.98
(Ca_0.89Mn_0.11)CO₃^a	2400	8.14	0.7281	0.0031	1.4260	− 8.62	− 8.68	− 1094.68	− 1095.02
(Ca_0.88Mn_0.12)CO₃^b	4800	8.13	0.6702	0.0023	1.2751	− 8.72	± 0.06	− 1095.24	± 0.34
	7200	8.14	0.6749	0.0025	1.2841	− 8.70		− 1095.13
(Ca_0.78Mn_0.22)CO₃^a	2400	8.04	0.9911	0.0046	1.9561	− 8.74	− 8.83	− 1059.46	− 1059.92
(Ca_0.76Mn_0.24)CO₃^b	4800	8.07	0.8657	0.0026	1.7596	− 8.85	± 0.08	− 1060.06	± 0.46
	7200	8.03	0.8708	0.0030	1.7536	− 8.88		− 1060.22
(Ca_0.68Mn_0.32)CO₃^a	2400	7.99	1.0729	0.0052	2.0771	− 8.99	− 9.04	− 1028.19	− 1028.46
(Ca_0.65Mn_0.35)CO₃^b	4800	8.01	1.0029	0.0039	1.9388	− 9.06	± 0.05	− 1028.55	± 0.27
	7200	8.02	0.9766	0.0039	1.8492	− 9.07		− 1028.64
(Ca_0.58Mn_0.42)CO₃^a	2400	8.01	1.0624	0.0057	2.0395	− 9.21	− 9.28	− 996.79	− 997.16
(Ca_0.54Mn_0.46)CO₃^b	4800	8.02	0.9609	0.0043	1.8495	− 9.32	± 0.07	− 997.37	± 0.37
	7200	7.98	1.0321	0.0049	1.9072	− 9.31		− 997.31
(Ca_0.47Mn_0.53)CO₃^a	2400	7.96	1.0554	0.0091	2.0089	− 9.39	− 9.45	− 962.13	− 962.49
(Ca_0.44Mn_0.56)CO₃^b	4800	7.97	1.1016	0.0058	2.0568	− 9.47	± 0.07	− 962.57	± 0.36
	7200	7.94	1.0914	0.0058	2.0347	− 9.51		− 962.78
(Ca_0.37Mn_0.63)CO₃^a	2400	8.00	1.4088	0.0100	2.0973	− 9.48	− 9.62	− 930.11	− 930.87
(Ca_0.34Mn_0.66)CO₃^b	4800	8.01	1.1903	0.0062	1.6380	− 9.73	± 0.13	− 931.48	± 0.76
	7200	7.96	1.1889	0.0073	2.0109	− 9.64		− 931.02
(Ca_0.28Mn_0.72)CO₃^a	2400	7.93	1.0275	0.0095	1.9579	− 9.79	− 9.82	− 902.68	− 902.89
(Ca_0.26Mn_0.74)CO₃^b	4800	7.98	1.0251	0.0074	1.9515	− 9.82	± 0.05	− 902.84	± 0.26
	7200	7.92	1.0789	0.0074	1.9774	− 9.87		− 903.14
(Ca_0.17Mn_0.83)CO₃^a	2400	7.90	0.9976	0.0102	1.8802	− 10.01	− 10.02	− 868.28	− 868.33
(Ca_0.16Mn_0.84)CO₃^b	4800	7.93	1.0205	0.0092	1.9245	− 10.01	± 0.02	− 868.26	± 0.11
	7200	7.86	1.0598	0.0101	1.9521	− 10.04		− 868.44
(Ca_0.08Mn_0.92)CO₃^a	2400	7.65	0.6258	0.0256	1.3296	− 10.21	− 10.23	− 840.16	− 840.23
(Ca_0.07Mn_0.93)CO₃^b	4800	7.66	0.7201	0.0199	1.5022	− 10.26	± 0.03	− 840.40	± 0.17
	7200	7.75	0.7722	0.0169	1.5735	− 10.21		− 840.13
(Ca_0.00Mn_1.00)CO₃	2400	7.29	0.0000	0.1871	0.5449	− 10.16	− 10.26	− 813.92	− 814.46
	4800	7.31	0.0000	0.1419	0.5413	− 10.26	± 0.10	− 814.47	± 0.54
	7200	7.34	0.0000	0.1380	0.4123	− 10.35		− 815.00

^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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ISSN: 1467-4866

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