Journal of Chemistry / 2021 / Article / Tab 5 / Research Article
Dissolution, Solubility, and Stability of the Basic Ferric Sulfate-Arsenates [Fe(SO4 )x (AsO4 )y (OH)z ·nH2 O] at 25–45°C and pH 2–10 Table 5 Experimental data and solubility determination for the basic ferric sulfate-arsenate FeSAsOH-4 [Fe(SO4 )0.28 (AsO4 )0.74 (OH)0.22 ·0.28H2 O and FeAsO4 ·0.75H2 O mixture].
Temp (°C) Initial pH Time (h) Dissolution data (mmol/L) Fe(SO4 )0.28 (AsO4 )0.74 (OH)0.22 ·0.28H2 O FeAsO4 ·0.75H2 O pH Fe SO4 AsO4 log_IAP Mean log_IAP log_IAP Mean log_IAP 25a 2 5760 1.96 0.131878 0.282386 0.054991 −22.66 −22.64 −23.89 −23.87 6480 1.97 0.133490 0.271627 0.054323 −22.64 ±0.02 −23.86 ±0.02 7200 1.97 0.133937 0.276617 0.054857 −22.63 −23.86 7920 1.97 0.133848 0.275370 0.054257 −22.63 −23.86 25 6 5760 3.20 0.000566 0.340704 0.005979 −24.39 −24.40 −25.53 −25.54 6480 3.20 0.000548 0.337897 0.005991 −24.40 ±0.01 −25.54 ±0.01 7200 3.20 0.000536 0.338832 0.006026 −24.41 −25.55 7920 3.20 0.000539 0.337585 0.006021 −24.41 −25.55 25 10 5760 3.20 0.000468 0.317314 0.006248 −24.47 −24.48 −25.59 −25.61 6480 3.20 0.000457 0.313884 0.006032 −24.49 ±0.01 −25.62 ±0.02 7200 3.20 0.000461 0.313416 0.006066 −24.48 −25.61 7920 3.20 0.000458 0.312325 0.006059 −24.49 −25.61 25b 2 5760 1.95 0.132953 0.281919 0.055792 −22.67 −22.66 −23.91 −23.90 6480 1.95 0.139488 0.283790 0.055591 −22.65 ±0.01 −23.89 ±0.01 7200 1.94 0.141100 0.280047 0.055925 −22.66 −23.90 7920 1.94 0.140025 0.283322 0.055391 −22.67 −23.91 35 2 5760 1.94 0.195266 0.389509 0.031099 −22.66 −22.66 −24.03 −24.03 6480 1.95 0.201264 0.383896 0.030899 −22.63 ±0.03 −24.00 ±0.03 7200 1.93 0.199742 0.382181 0.030565 −22.68 −24.05 7920 1.93 0.200369 0.382492 0.030565 −22.68 −24.05 45 2 5760 1.89 0.275127 0.484937 0.024692 −22.67 −22.64 −24.12 −24.09 6480 1.90 0.288914 0.487276 0.024359 −22.63 ±0.03 −24.09 ±0.03 7200 1.90 0.291511 0.484625 0.024359 −22.63 −24.08 7920 1.90 0.289989 0.488680 0.024626 −22.62 −24.08
a,b Dissolution tests in duplicate.