Evaluation of Mehlich 3 reagent as a multielement extractant in mine soils

✍ Scribed by C. Monterroso; E. Alvarez; M. L. Fernández Marcos

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 210 KB
• Volume: 10
• Category: Article
• ISSN: 1085-3278
• DOI: 10.1002/(sici)1099-145x(199901/02)10:1<35::aid-ldr319>3.0.co;2-6

✦ Synopsis

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 (de®ciency 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 signi®cantly 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). Signi®cant correlations were found between Fe, Cu, Zn and Cd extracted by M3 and DTPA; for Mn, Ni, Co and Pb dierent 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.