Soil tests for copper, iron, manganese, and zinc in histosols. 3. A comparison of eight extractants for measuring active and reserve forms of the elements

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Soil Sci.; (United States)

OSTI ID:6212237

Levesque, M; Mathur, S P

The authors extracted 55 cultivated organic soils with (1) 0.5 M HCl + 0.05 M AlCl/sub 3/, (2) 1.0 MNH/sub 4/HCO/sub 3/ + 0.005 MDTPA, (3) 0.005 MDTPA + 0.1 M TEA, (4) 1.0 MNH/sub 4/OAC + 0.2 MEDTA, (5) 0.1 MEDTA, (6) 0.1 M HCl, (7) 2.5% HOAC, and (8) 1.0 MNH/sub 4/OAC to compare the results with previously identified and quantified active and reserve forms of Cu, Fe, Mn, and Zn in the soils. The intensity factor of Cu, Fe, Mn and Zn in these soils was considered to be mainly H/sub 2/O-soluble and Ca-exchangeable. For Cu and Fe, the capacity factor was chiefly composed of strongly complexed and sulfide-associated portions, and the capacity factor for Mn included readily reducible oxides and weakly or strongly complexed forms. For Cu, Fe, and Mn, only extractants 1 (HCl + AlCl/sub 3/) and 2 (NH/sub 4/HCO/sub 3/ + DTPA) gave soil test values that were (1) greater than or equal to the intensity factor, (2) correlated with both the intensity and capacity factors of the soils, but (3) did not exceed the sum of the two factors. The effectiveness of extractants 1 and 2 for either Cu, Fe, Mn, or Zn was not adversely affected by the level of the other three elements.

• Research Organization: Agriculture Canada, Ottawa, Ontario
• OSTI ID: 6212237
• Journal Information: Soil Sci.; (United States), Journal Name: Soil Sci.; (United States) Vol. 145:3; ISSN SOSCA
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
COPPER
ECOLOGICAL CONCENTRATION
ELEMENTS
EXTRACTION
IRON
MANGANESE
MEASURING METHODS
METALS
SEPARATION PROCESSES
SOILS
TRANSITION ELEMENTS
ZINC