Effects of Pyrophosphate, EDTA, and DTPA on Zinc Sorption by Montmorillonite

Asher, Leon; Bar‐Yosef, B.

doi:10.2136/sssaj1982.03615995004600020011x

Cited by 12 publications

(6 citation statements)

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“…1 of soil and were recovered in the extract (Table 4), showing that added Zn was not adsorbed by the soil. The results are in agreement with those of Asher and Bar-Yosef (1982) who observed that at pH 9 Zn was not adsorbed onto a Ca-montmorillonite suspended in a 0.0096 M pyrophosphate solution containing 8.0 mg Zn dm' 3 . It can thus be concluded that Zn of the commercial chemical is not adsorbed either but only gives rise to a high background absorption.…”

Section: Soilsupporting

confidence: 93%

“…The use ofpyrophosphate solution as the extractant for Zn bound by organic matter is based on the ability of pyrophosphate to solubilize humic substances (Bremner andLees 1949, Mortvedt andOsborn 1977) and on the ability of pyrophosphate anion to form soluble complexes with Zn Bar-Yosef 1982, Bar-Yosef andAsher 1983). It has been hypothesized that polyvalent cations complexed to organic matter are responsible for keeping organic matter in a flocculated and water-insoluble state.…”

Section: H Zinc Hound By Organic Mattermentioning

confidence: 99%

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Plant-availability of soil and fertilizer zinc in cultivated soils of Finland

Yli‐Halla¹

1993

AFSci

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The Zn status of cultivated soils of Finland was investigated by chemical analyses and bioassays. The effect on ryegrass of different Zn fertilizers and Zn rates was studied in pot experiments and their effect on barley and timothy in field experiments. In an uncontaminated surface soil material of 72 mineral soils and 34 organogenic soils, total Zn (Zntot) was 10.3-202 mg kg-1(median 66 mg kg-1). In mineral soils, Zntot correlated positively with clay content (r = 0.81***) and in organogenic soils negatively with organic C (r = -0.53***). Zinc bound by organic matter and sesquioxides was sequentially extracted by 0.1 M K4P2O7 (Znpy) and 0.05 M oxalate at pH 2.9 (Znox), respectively. The sum Znpy + Znox, a measure of secondary Zn potentially available to plants, was 2 - 88% of Zntot and was the lowest in clay (median 5%) and highest in peat soils (median 49%). Water-soluble and exchangeable Zn consisted of0.3 - 37% (median 3%) of Zntot, the percentage being higher in acid soils, particularly in peat soils. Zinc was also extracted by 0.5 M ammonium acetate - 0,5 M acetic acid - 0.02 M Na2-EDTA at pH 4.65 (ZnAC), the method used in soil testing in Finland. The quantities of ZnAC (median 2.9 mg dm-3, range 0.6 - 29.9 mg dm-3) averaged 50% and 75% of Znpy + Znox in mineral and organogenic soils, respectively, and correlated closely with Znpy. In soil profiles, ZnAC was with few exceptions higher in the plough layer (0 - 20 cm) than in the subsoil (30 - 100 cm). In an intensive pot experiment on 107 surface soils, four crops of ryegrass took up 2 - 68% (median 26%)of Znpy + Znox. The plant-available Zn reserves were not exhausted even though in a few peat soils the Zn supply to grass decreased over time. Variation of Zn uptake was quite accurately explained by ZnAC but increasing pH had a negative impact on Zn uptake. Application of Zn (10 mg dm-3 of soil as ZnSO4 * 7 H2O) did not give rise to yield increases. In mineral soils, increase of plant Zn concentration correlated negatively with soil pH while ZnAC was of secondary importance. In those organogenic soils in which the reserves of native Zn were the most effectively utilized, plant Zn concentration also responded most strongly to applied Zn. In two 2-year field experiments, Zn application did not increase timothy or barley yields. Zinc concentration of timothy increased from 30 mg kg-1 to 33 and 36 mg kg-1 when 3 or 6 kg Zn ha-1 was applied, respectively. The efficiency of ZnSO4 * 7 H2O alone did not differ from that of a fertilizer where ZnSO4 * 7H20 was granulated with gypsum. Zinc concentration of barley grains increased by foliar sprays of Na2Zn-EDTA but only a marginal response to soil-applied Zn (4.8 or 5.4 kg ha-1 over three years) was detected in three 3-year experiments. High applications of Zn to soil (15 or 30 kg ha-1 as ZnSO4 * 7H2O) were required to increase Zn concentration of barley markedly. In order to prevent undue accumulation of fertilizer Zn in soil, it is proposed that Zn fertilizer recommendations for field crops should be based on both soil pH and ZnAC. In slightly acid and neutral soils, even if poor in Zn, response of plant Zn concentration to applied Zn remains small while there is a high response in strongly acid soils.

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Section: Soilsupporting

confidence: 93%

Section: H Zinc Hound By Organic Mattermentioning

confidence: 99%

Plant-availability of soil and fertilizer zinc in cultivated soils of Finland

Yli‐Halla¹

1993

AFSci

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“…The Na 4 P 2 O 7 extractions were performed with the procedure of Vieiriae et al (1993). The contact time was 16 h, with 0.1 M Na 4 P 2 O 7 at pH = 10: maximum efficiency is for pH N 9 (Asher and Bar-Yosef, 1982). The EDTA extraction conditions were chosen such that EDTA was in excess at equilibrium (Gesthem and Bermond, 1998).…”

Section: Measure Of Metal Concentrations and Chemical Extractionsmentioning

confidence: 99%

Interactions between metals and soil organic matter in various particle size fractions of soil contaminated with waste water

Quénéa¹,

Lamy²,

Winterton³

et al. 2009

Geoderma

174

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. Interactions between metals and soil organic matter in various particle size fractions of soil contaminated with waste water. Geoderma, Elsevier, 2009Elsevier, , vol. 1, pp. 217-223. 10.1016Elsevier, /j.geoderma.2008 Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Only scarce field studies concern the consequences of natural soil organic matter (SOM) and metal interactions on SOM dynamics in soils. We investigated the interactions of four metals (Pb, Zn, Cu and Cd) with the SOM associated to five different size fractions (between 2000 µm and b2 µm) of a sandy top soil contaminated by waste water. Metal, organic carbon and nitrogen concentrations were measured and chemical extractions (with Na 4 P 2 O 7 and EDTA) were also performed to assess the variations of SOM-metal interactions irrespective of the size fraction. In addition, as in that selected contaminated site, maize (C 4 plant), replaced C 3 crops 15 years ago, natural isotopic 13 C labelling gave new insights into SOM turnover. First, the results suggest that metals influence the SOM dynamics in that sandy soil: a C 3 "old carbon" enrichment was observed in the small or clay size fractions, while the "new" C 4 carbon associated with sandy soil particles presents a rapid turnover. Metal accumulation in the clay fraction is attributed to particulate organic matter (poorly associated) and SOM decay which overtime accumulated metals and eventually these metal-SOM associations prevent the biological decomposition of such carbon pools. Moreover, the δ 13 C signals, C/N ratios and results from chemical extractions clearly showed differences in the origin, nature and reactivity of the SOM as a function of the size fraction with consequences on the metal behaviour. Differences were observed between metals studied: Zn seems to be mainly bound to SOM associated with clay particles, while Pb seems to prefer to interact directly with the mineral surfaces versus the SOM.

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“…Schmitt and Sticher (1986) investigated under laboratory conditions the sorption of Cd, Cu, and Pb in soils and reported a higher availability of these heavy metals when applied concurrently due to competition for the sorption sites. Asher and Bar-Yosef (1982) measured a decrease in the sorption of Zn by Ca-rich montmorillonite with increasing concentration of KC104 in the solution. Similarly, decreases in the sorption of Pb and Cd by montmorillonite with increasing quantities of Ca-cations in solution were reported by Griffin and Au (1977), Christensen (1984), and Inskeep and Baham (1983).…”

Section: Introductionmentioning

confidence: 99%

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Matthes

Madsen

Kahr

1999

Clays and clay miner.

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Abstract--The sorption of Cd, Cu, Pb, and Zn ions by Na-rich bentonite, AI and Zr-pillared Na-rich bentonite (A1-MX80, Zr-MX80), the uncalcined hydroxy-intercalated precursors (HA1, HZr-MX80), and commercial Al-pillared bentonite EXM 534 was investigated. Experiments were conducted in ultrapure water and artificial leachate with varying pH. The experiments were performed over periods to 30 wk. Sorption characteristics were described with one and two-site Langmuir isotherms. The non-exchangeable quantities of heavy metals were determined by fusion of the sorbents after ion exchange with ammonium acetate.The sorption of Cd, Cu, Pb, and Zn by bentonite was dominated by cation exchange. In artificial leachate, the sorption was reduced due to competition with alkali and alkaline-earth cations. The sorption of Cu, Zn, and Pb at pH 4.9 and Cd at pH 6.9 by A1 and Zr-hydroxy-intercalated and pillared MX80 was governed also by cation exchange. In contrast, the sorbed quantities of Zn at pH 6.9 exceeded the cation exchange capacity (CEC) of HA1, HZr, A1, Zr-MX80, and EXM 534 and were partially nonexchangeable. The increase of the sorption of Zn with pH and its independence of the ionic strength of the solution at neutral pH suggest a complexation of Zn ions to surface hydroxyl groups of the intercalated A1 and Zr-polyhydroxo cations and pillars. This complexation is the dominating sorption mechanism. Removal of dissolved Zn from solution with time is attributed to surface precipitation. Al-hydroxy and pillared bentonites are considered potential sorbents of Zn ions from neutral pH aqueous solutions, such as waste waters and leachates.

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Effects of Pyrophosphate, EDTA, and DTPA on Zinc Sorption by Montmorillonite

Cited by 12 publications

References 0 publications

Plant-availability of soil and fertilizer zinc in cultivated soils of Finland

Plant-availability of soil and fertilizer zinc in cultivated soils of Finland

Interactions between metals and soil organic matter in various particle size fractions of soil contaminated with waste water

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

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