Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Goethite aggregates

Fig. 15.7 Glo bular goethite aggregates on quartz grains in a 20000 year old Quarternary sand deposit at Karup, Jutland, Denmark (Postma, Brocken-huus-Schack, 1987 with permission). Fig. 15.7 Glo bular goethite aggregates on quartz grains in a 20000 year old Quarternary sand deposit at Karup, Jutland, Denmark (Postma, Brocken-huus-Schack, 1987 with permission).
Pores may be present as structural features (e. g. between domains) or as a result of aggregation of particles. They may also be the result of partial dehydroxylation (oxide hydroxides) or dissolution. Although the shapes of pores can be quite variable, there are some definite, basic forms. The commonest of these are 1) slit shaped, the walls of which may or may not be parallel 2) ink bottle which are closed upon all sides but one from which a narrow neck opens and 3) cylindrical. Upon partial dissolution, pores bounded by well-defined crystal planes (e. g. 102 in goethite) develop (Chap. 12). [Pg.98]

Microscope observations and chemical analyses help locate the Fe oxides in the fabric of matrix soil particles. Single Fe oxide-containing aggregates which appear uniform to the naked eye, may vary appreciably in Fe content and mineralogy (Ford-ham Norrish, 1979). SEM and TEM photos show goethite and hematite crystals in strongly developed soils to be associated in a more or less systematic fashion with flakes of kaolinite, usually the main matrix mineral in such soils (Fig. 16.19 a-c)... [Pg.469]

Anderson, M.A. Tejedor-Tejedor, M.I. Stan-forth, R.R. (1985) Influence of aggregation on the uptake kinetics of phosphate by goethite. Fnviron. Sci. Techn. 19 632-637... [Pg.555]

Conformations and aggregate structures of sorbed natural organic matter on muscovite and hematite. Geochim. Cosmo-chim. Ada 65 1047-1057 Nanzyo, M. Watanabe,Y. (1981) Material balance associated with phosphate sorption by amorphous clays, silica-alumina gel and synthetic goethite. Soil Sd. Plant Nutr. 27 329-337... [Pg.612]

Figure 1. High-resolution transmission electron microscope image of goethite from weathered amphibole. Note the nanometer-scale porosity that separates oriented nanociystals. Similar aggregates were reported by Smith et al. (1983, 1987) in botiyoidal goethite (Banfield and Barker, unpublished data). Figure 1. High-resolution transmission electron microscope image of goethite from weathered amphibole. Note the nanometer-scale porosity that separates oriented nanociystals. Similar aggregates were reported by Smith et al. (1983, 1987) in botiyoidal goethite (Banfield and Barker, unpublished data).
See other pages where Goethite aggregates is mentioned: [Pg.387]    [Pg.470]    [Pg.65]    [Pg.387]    [Pg.470]    [Pg.65]    [Pg.43]    [Pg.69]    [Pg.4]    [Pg.64]    [Pg.72]    [Pg.74]    [Pg.103]    [Pg.134]    [Pg.239]    [Pg.242]    [Pg.268]    [Pg.283]    [Pg.357]    [Pg.374]    [Pg.378]    [Pg.385]    [Pg.388]    [Pg.392]    [Pg.395]    [Pg.413]    [Pg.446]    [Pg.454]    [Pg.469]    [Pg.469]    [Pg.471]    [Pg.474]    [Pg.578]    [Pg.589]    [Pg.415]    [Pg.91]    [Pg.180]    [Pg.183]    [Pg.15]    [Pg.22]    [Pg.40]    [Pg.48]    [Pg.61]    [Pg.154]    [Pg.9]    [Pg.196]    [Pg.831]   
See also in sourсe #XX -- [ Pg.74 ]



SEARCH



Goethite

© 2024 chempedia.info