By Douglas G. Brookins
At final geochemists are provided one entire reference booklet which supplies the Eh-pH diagrams for seventy five parts present in the earth's floor atmosphere, together with transuranic and different radioactive species. for every of those newly calculated diagrams brief explanatory texts are additional. For the 1st time the first parts are thought of in water with steel, sulfur, carbon, and different species as acceptable. moreover, in response to those figures and up to date thermodynamic facts awarded during this reference, researchers can expect the habit of components within the floor atmosphere. Geoscientists, chemists and environmental businesses also will reap the benefits of a number of short texts at the value of assorted components to difficulties of radioactive waste disposal.
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Additional info for Eh-pH Diagrams for Geochemistry
The assumed activity for dissolved Ga = to- 8 , See text for discussion 49 INDIUM The Eh-pH diagram for indium species is shown in. Fig. 22. The thermodynamic data for important indium species are given in Thble 20. Indium is an extremely rare element in the earth's crust. In the system InO-H-S (Fig. 22), it is noted that below the sulfide-sulfate boundary the species In2S3 occupies all the Eh-pH space. 5 for an assumed activity of dissolved In = to- 8 • Under acidic conditions, In3+ and InOH 2+ occur, and In(OH)i is metastable with respect to these species.
24. Eh-pH diagram for part of the system Zn-O-H-S-C. The assumed activities for dissolved species are: Zn = 10- 6, -4, C = 10-3, S = 10- 3• See text for discussion 55 CADMIUM The Eh-pH diagram for cadmium species is shown in Fig. 25. The thermodynamic data for important cadmium species are given in Thble 23. The Eh-pH diagram for the system Cd-C-S-O-H (Fig. 25) is fairly similar to that for the system Zn-O-H-S-C (Fig. 24) which is to be suspected based on their geochemical similarities. In Fig.
1982) Wagman et a1. (1982) Robie et a1. (1978) Barner and Scheuerman (1978) Pourbaix (1966) Pourbaix (1966) snS~ (c) Sn~- (aq) HSnOi (aq) Abbreviations see Table 1 40 - ~ ~ iii 0 2 4 I pH I Fig. 16. Eh-pH diagram for part of the system Sn-O-H. 8 2 4 8 pH 8110. 8 10 1- SnOa 12 , 10" I I I I I I I I I I 14 :::",j 10-- I I I I I I I I I Fig. 17. Eh-pH diagram for part of the system Sn-S-O-H. 2 LEAD The Eh-pH diagram for lead species is shown in Fig. 18. The thermodynamic data for important lead species are given in Thble 16.