Reference

Extractable metals in soils, sewage sludge treated soils and related materials 1982

Extractable metals in soils, sewage sludge treated soils and related materials 1982. (United Kingdom Dept. of the Environment; Natl. Water Counc., UK). Methods Exam. Waters Assoc.Chemicals with cas numbers 60-00-4 and 7440-43-9 also play role. Mater., Volume Date 1982, (Extr. Met. Soils, Sewage Sludge-Treated Soils Relat. Mater.), 17 pp. (English) 1983. CODEN: MEWMD5. ISSN: 0141-075X. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) Section cross-reference(s): 79 Methods of extn. of metals such as Cd, Cu, Pb, Mn, Ni, and Zn with 0.05 M EDTA, and Ni and Zn with 0.5 M HOAC from soils and related materials are described. Both extn. methods are followed by final detn. with an air/C2H2 flame at. absorption spectrophotometer. The performance characteristics of each method, principle, interferences, hazards, reagents, app., sampling, anal. procedure, and calibration curve are given. Detection limits with EDTA extn. ranged 0.05 mg/kg for Zn to 0.50 mg/kg for Ni. .

Characterization of iron in alkaline EDTA and ammonium hydroxide extracts of podzols

Characterization of iron in alkaline EDTA and ammonium hydroxide extracts of podzols. McBride, M. B.; Goodman, B. A.; Russell, J. D.; Fraser, A. R.; Farmer, V. C.; Dickson, D. P. E. (Cornell Univ., Ithaca, NY, USA). J. Soil Sci., 34(4), 825-40 (English) 1983. CODEN: JSSCAH.There are some reagents with their cas registry numbers 60-00-4 and 1309-33-7 are used in this study. ISSN: 0022-4588. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) Moessbauer and ESR spectroscopy have shown that the Fe extd. from the Bh horizons of an iron humus podzol and an iron podzol by EDTA [60-00-4] at pH 9.1 is predominantly in the form of complexes of polymeric Fe(III) hydroxide and oxide with org. matter (O.M.). Small amts. of monomeric Fe(III)-O.M. and Fe(III)-EDTA [15275-07-7] complexes also occur. In contrast EDTA at pH 7 exts. Fe from these podzols predominantly in the form of Fe-EDTA complexes. Some monomeric Fe(III)-O.M. complex also occurs in a pH 9.1 NH4 OH ext. of these horizons and in a pH 9.1 EDTA ext. of the B2 horizon of a peaty podzol. Dialysis expts. show that the particle dimensions of the polymeric hydroxy Fe(III)-O.M. complex, which accounts for ~66% of the Fe extd. from the iron humus podzol and ~36% of that from the iron podzol, are >2.4 nm. The thermal behavior of the Moessbauer peaks indicated that the size of the Fe cores was ~5 nm, thus suggesting that the complex probably consists of hydroxyiron cores surrounded by large org. mols. Results from x-ray diffraction and IR suggest that these hydroxyiron cores may have structural organizations similar to those of goethite and ferrihydrite. The relation between these forms of Fe in the exts. and those in the soil is briefly discussed. .