IN-SITU DETERMINATION OF THE APPARENT SOLUBILITY PRODUCT OF AMORPHOUS IRON SULFIDE

被引:13
作者
BAGANDER, LE
CARMAN, R
机构
[1] Department of Geology and Geochemistry, Section of Biogeochemistry, Stockholm University
关键词
D O I
10.1016/0883-2927(94)90060-4
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The apparent (pK(s)') and pK(sp)NBS solubility products of amorphous iron sulphide (FeS) were determined experimentally, in situ, in the Baltic Sea. The apparent and pK(sp)NBS equilibrium constants were 2.6 and 3.15, respectively, at a mean experimental temperature of 15.8-degrees-C. The temperature dependence of the apparent equilibrium constant (within the temperature range 12.8-18.8-degrees-C) is described by the equation: pK(s) = -0.068t + 3.70, where t denotes the temperature in centigrade. The composition of the amorphous precipitate was estimated to be FeS0.86. The charge of the non-stoichiometric iron sulphide compound is most likely charge balanced by some major sea salt anion, e.g. chlorine and/or fluorine. Such charge balance has been observed for colloidal amorphous iron (III) hydroxides, another common and kineticly fast-forming precipitate in natural waters.
引用
收藏
页码:379 / 386
页数:8
相关论文
共 61 条
[31]  
Hallberg, Bagander, Engvall, Schippel, Method for studying geochemistry of sediment-water interface, Ambio, 1, pp. 71-72, (1972)
[32]  
Heaney, Davison, The determination of ferrous iron in natural waters with 2,2’ bipyridyl, Limnology and Oceanography, 22, pp. 753-760, (1977)
[33]  
Ingri, Kakolowicz, Sillen, Warnquist, Haltafall, a general program for calculating the composition of equilibrium mixtures, Talanta, 14, pp. 1261-1286, (1977)
[34]  
Kjensmo, The development and some main features of “iron-meromictic” soft water lakes, Archs Hydrobiol. Suppl., 32, pp. 137-312, (1967)
[35]  
Koroleff, A note on the iron content of the Baltic waters, ICES. C.M. 1968/C, 34, (1968)
[36]  
Lahann, Molybdenum and iron behavior in oxic and anoxic lake water, Chem. Geol., 20, pp. 315-323, (1977)
[37]  
Lindstrom, Transformation of iron constituents during early diagenesis— in situ studies of a Baltic Sea sediment-water interface. Contribution in Microbial Geochemistry, (1980)
[38]  
Luther, Pyrite synthesis via polysulfide compounds, Geochim. cosmochim. Acta, 55, pp. 2839-2849, (1991)
[39]  
Machel, Some aspects of diagenetic sulfate-hydrocarbon redox reactions, Diagenesis of Sedimentary Sequences, 36, pp. 15-28, (1988)
[40]  
Morse, Casey, Ostwald processes and mineral paragenesis in sediments, Am. J. Sci., 288, pp. 537-560, (1988)