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Evaluation of Mehlich 3 reagent as a multielement extractant in mine soils
Author(s) -
Monterroso C.,
Alvarez E.,
Fernández Marcos M. L.
Publication year - 1999
Publication title -
land degradation and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.403
H-Index - 81
eISSN - 1099-145X
pISSN - 1085-3278
DOI - 10.1002/(sici)1099-145x(199901/02)10:1<35::aid-ldr319>3.0.co;2-6
Subject(s) - reagent , oxalate , chemistry , soil water , aluminium , environmental chemistry , heavy metals , nuclear chemistry , mineralogy , inorganic chemistry , geology , soil science , organic chemistry
The usefulness of Mehlich 3 (M3) reagent was evaluated as a method to extract numerous elements from coalmine soils in As Pontes (Spain) showing a wide range of physicochemical properties. Critical levels (deficiency and/or toxicity) were established for plant available elements extracted by this reagent. The M3 method was compared to 1M NH 4 Cl, Olsen, acid oxalate, and DTPA methods as extractants for exchangeable Ca, Mg and K, available P, non‐crystalline aluminium, and available heavy metals, respectively. The M3 method correlated significantly to NH 4 Cl for Ca, Mg and K ( r =0·76, 0·84 and 0·87, respectively), to Olsen P ( r =0·77) and to oxalate Al ( r =0·77). Significant correlations were found between Fe, Cu, Zn and Cd extracted by M3 and DTPA; for Mn, Ni, Co and Pb different relationship between methods were obtained for acid and alkaline samples, so that critical levels were established for M3 metals as a function of soil pH. Copyright © 1999 John Wiley & Sons, Ltd.