Activity measurements of zinc in soils of different pH using EDTA

Sachdev, P.; Lindsay, W. L.; Deb, D. L.

doi:10.1016/0016-7061(92)90086-m

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…According to McBride and Blasiak (56), a 97% decrease in Zn concentration was observed in acidic soil for each unit increase in soil pH between 5 and 7. Sachdev et al (57) reported that the Zn 2+ activity decreased approximately 99% for each unit increase in pH. In the present study, as with available Zn, this Zn fraction (F1) diminished with time in both soils (see Figure 1).…”

Section: Resultssupporting

confidence: 69%

Influence of Soil Type on the Mobility and Bioavailability of Chelated Zinc

Álvarez

2007

J. Agric. Food Chem.

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The objective of this study was to compare the distribution, mobility, and relative effectiveness of Zn from Zn-amino acids (Zn-AA) and Zn-DTPA-HEDTA-EDTA (Zn-CH) (DTPA, diethylenetriaminepentaacetate; HEDTA, N-2-hydroxyethyl-ethylenedinitrilotriacetate; and EDTA, ethylenedinitrilotetraacetate) sources by applying different Zn levels to weakly acidic and neutral soils in laboratory (incubation and soil column studies) and greenhouse conditions. The experiments were carried out for 60 days in incubation and column experiments and for 45 days in a greenhouse experiment. The zinc soil behavior was evaluated by DTPA-TEA and Mehlich-3 extractions and sequential speciation. The incubation experiment showed that the highest concentrations of available Zn in weakly acidic soil occurred with Zn-AA treatments, whereas in the neutral soil Zn-CH treatments produced the highest quantities of available Zn. The column experiment showed that in neutral soil, with slow to moderate permeability in the Ap and Bt horizons, only Zn-CH significantly increased the mobility of Zn through the column with respect to the control and the Zn-AA source: 31% of the Zn applied as synthetic chelate was leached from the column. The greenhouse experiment showed that, at different rates of Zn application, the Zn carriers increased Zn uptake by maize (Zea mays L.). The use of applied Zn by maize, or Zn utilization, was greatest when the Zn treatments were Zn-CH (3.3%) at 20 mg kg-1 and Zn-CH (4.9%) at 10 mg kg-1, in weakly acidic and neutral soils, respectively.

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Section: Resultssupporting

confidence: 69%

Influence of Soil Type on the Mobility and Bioavailability of Chelated Zinc

Álvarez

2007

J. Agric. Food Chem.

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“…It is well accepted that precipitation of Zn is most likely in alkaline soils with a pH range of 7-8 (Brü mmer et al, 1983). According to Sachdev et al (1992), the Zn 2+ activity decreases approximately 100-fold for each unit increase in pH.…”

Section: Discussionmentioning

confidence: 97%

Comparison of EDTA and sequential extraction tests for phytoavailability prediction of manganese and zinc in agricultural alkaline soils

et al. 2006

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“…Examples of the former are ion-selective electrodes for Cu (11)(12)(13)(14)(15) and Cd (16) and anodic stripping voltammetry (where electrochemically labile metal complexes are measured and can include both organic and inorganic complexes) (17)(18)(19)(20)(21). Nonelectrochemical methods include ion-exchange resins (17,18,(22)(23)(24)(25)(26), competitive chelation (27,28), and ultrafiltration and dialysis (13,20,29). Most of these methods suffer from chemical interferences, poor limits of detection, or disturbance of solution equilibria (10).…”

Section: Introductionmentioning

confidence: 99%

Chemical Speciation of Zn, Cd, Cu, and Pb in Pore Waters of Agricultural and Contaminated Soils Using Donnan Dialysis

Nolan

McLaughlin

Mason

2002

Environ. Sci. Technol.

172

125

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Knowledge of trace metal speciation in soil pore waters is important in addressing metal bioavailability and risk assessment of contaminated soils. Numerous analytical methods have been utilized for determining trace metal speciation in aqueous environmental matrixes; however, most of these methods suffer from significant interferences. The Donnan dialysis membrane technique minimizes these interferences and has been used in this study to determine free Zn2+, Cd2+, Cu2+, and Pb2+ activities in pore waters from 15 agricultural and 12 long-term contaminated soils. The soils vary widely in their origin, pH, organic carbon content, and total metal concentrations. Pore water pM2+ activities also covered a wide range and were controlled by soil pH and total metal concentrations. For the agricultural soils, most of the free metal activities were below detection limit, apart from Zn2+ for which the fraction of free Zn2+ in soluble Zn ranged from 2.3 to 87% (mean 43%). Five of the agricultural soils had detectable free Cd2+ with fractions of free metal ranging from 59 to 102% (mean 75%). For the contaminated soils with detectable free metal concentrations, the fraction of free metal as a percentage of soluble metal varied from 9.9 to 97% (mean 50%) for Zn2+, from 22 to 86% (mean 49%) for Cd2+, from 0.4 to 32.1% (mean 5%) for Cu2+, and from 2.9 to 48.8% (mean 20.1%) for Pb2+. For the contaminated soils, the equilibrium speciation programs GEOCHEM and WHAM Model VI provided reasonable estimates of free Zn2+ fractions in comparison to the measured fractions (R2 approximately 0.7), while estimates of free Cd2+ fractions were less agreeable (R2 approximately 0.5). The models generally predicted stronger binding of Cu2+ to DOC and hence lower fractions of free Cu2+ as compared with the observed fractions. The binding of Cu2+ and Pb2+ to DOC predicted by WHAM Model VI was much strongerthan that predicted by GEOCHEM.

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Activity measurements of zinc in soils of different pH using EDTA

Cited by 12 publications

References 7 publications

Influence of Soil Type on the Mobility and Bioavailability of Chelated Zinc

Influence of Soil Type on the Mobility and Bioavailability of Chelated Zinc

Comparison of EDTA and sequential extraction tests for phytoavailability prediction of manganese and zinc in agricultural alkaline soils

Chemical Speciation of Zn, Cd, Cu, and Pb in Pore Waters of Agricultural and Contaminated Soils Using Donnan Dialysis

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