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Adsorption and Extractability of Molybdenum in Relation to Some Chemical Properties of Soil
Author(s) -
Karimian N.,
Cox F. R.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200050021x
Subject(s) - ammonium oxalate , adsorption , chemistry , soil water , oxalate , molybdenum , organic matter , aqueous solution , inorganic chemistry , lime , dissolution , freundlich equation , langmuir , oxide , nuclear chemistry , environmental chemistry , metallurgy , materials science , soil science , geology , organic chemistry
Development of a practical soil test for molybdenum (Mo) will depend on selection of the proper extractant. To achieve this, more knowledge is needed about Mo adsorption and its extractability, especially in relation to other soil properties. Adsorption of Mo from aqueous solutions was determined for eight soils from the Atlantic Coastal Plain and Piedmont regions. The data followed the Freundlich isotherm more consistently than the Langmuir. Adsorption increased as the organic matter and/or Fe oxide contents of the soils increased. Adsorption from an aqueous solution that was initially 0.3 m M Mo (AdMo) also was determined on 32 soils collected from the regions. The AdMo level was positively correlated with Fe oxide and organic matter contents and negatively correlated with pH and P levels. The level of Mo extracted with acid ammonium oxalate (Grigg Mo) and an anion exchange resin (resin Mo) were also determined and related to soil chemical properties and a lime treatment. Grigg Mo was positively correlated with amorphous and free Fe oxide contents, probably as a result of the strong dissolution of Fe oxide by oxalate. Resin Mo was positively correlated with pH but not with other soil properties. Incubating soils with CaCO 3 increased the level of resin Mo.