Detail of "1310-14-1"

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Comparative study of the adsorption-desorption behavior of copper(II), zinc(II), cobalt(II) and lead(II) at the goethite-solution interface

Comparative study of the adsorption-desorption behavior of copper(II), zinc(II), cobalt(II) and lead(II) at the goethite-solution interface. Padmanabham, M. (S. V. Agric. Coll., A. P. Agric. Univ., Tirupati 517 502, India). Aust. J. Soil Res., 21(4), 515-25 (English) 1983. CODEN: ASORAB. ISSN: 0004-9573. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) The relative position of the adsorption curves for Cu(II), Zn(II), Co(II), and Pb(II) on goethite (d-FeOOH) [1310-14-1] with respect to pH is related to the hydrolyzability of the metal ion in soln. Thus the pH values at which the same molar amts. of these cations are adsorbed on the oxide surface are correlated with their resp. 1st hydrolysis consts. (pKi*) in soln. Such adsorption occurs well below the pKi* values, resulting in the release of 1-2 mol of protons/mol of cation specifically adsorbed. The relative effect of anions such as Cl - and NO3- on the adsorption-desorption behavior of Zn(II), Co(II), and Pb(II) has also been investigated. Desorption trends for similar molar amts. of adsorbed cation, Cu(II), Zn(II), and Co(II) are identical. 14797-55-8 and 7439-92-1 are also in the experiment. The existence of 2 distinct types of adsorption sites on the oxide surface corresponding with the readily desorbed and less readily desorbed fractions of micronutrient cations such as Cu, Zn, or Co has been confirmed. The metal cation concn. and proton concn. play a dual role in detg. the partition of heavy metal cations between the soln. and surface phases. The position of the adsorption curve for Pb(II) with respect to pH is close to that for Cu(II), but desorption of whereas that of Pb(II) does not. Specifically adsorbed Pb in the presence of either Cl- or NO3- is reversible with respect to its concn. in soln. with no hysteresis between adsorption and desorption isotherms. All the adsorbed Pb is readily desorbable. .

Theoretical considerations of the reductive dissolution of iron(III) oxides

Theoretical considerations of the reductive dissolution of iron(III) oxides. Fischer, W. R. (Tech. Univ. Muenchen, Freising-Weihenstephan 8050, Fed. Rep. Ger.). Z. Pflanzenernaehr. Bodenkd., 146(5), 611-22 (German) 1983. CODEN: ZPBOAL. ISSN: 0044-3263. DOCUMENT TYPE: Journal CA Section: 53 (Mineralogical and Geological Chemistry) In considering equil., the extent of reductive dissoln. of Fe(III) oxides, including hematite [1317-60-8], goethite [1310-14-1], lepidocrocite [12022-37-6], and ferrihydrite [39473-89-7], can be obtained from the Nerst equation. At a given pH, the max. Fe2+ concn. depends on the std. potential of the system, which decreases with increasing stability of the Fe oxide. 1317-60-8 and 39473-89-7 are cas registry numbers of chemicals which are used as reagents here. Crystal imperfections and increasing surface area lead to an increase of the equil. of Fe2+ concn., whereas the effect of ionic replacement cannot be detd. in general. The formation of stable Fe complexes or of solid Fe2+ compds. results in a higher extent of redn. Theor. calcns. suggest that, for bacterial redn. of Fe oxides, the electron transfer between donor and Fe(III) precedes the protolytic dissoln. of the oxide. .