Home > Research > Publications & Outputs > Proton interactions with soil organic matter ; ...
View graph of relations

Proton interactions with soil organic matter ; the importance of aggregation and the weak acids of humin.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

Standard

Proton interactions with soil organic matter ; the importance of aggregation and the weak acids of humin. / Cooke, James D.; Tipping, Edward; Hamilton-Taylor, John.
In: European Journal of Soil Science, Vol. 59, No. 6, 12.2008, p. 1111-1121.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

APA

Vancouver

Cooke JD, Tipping E, Hamilton-Taylor J. Proton interactions with soil organic matter ; the importance of aggregation and the weak acids of humin. European Journal of Soil Science. 2008 Dec;59(6):1111-1121. doi: 10.1111/j.1365-2389.2008.01071.x

Author

Bibtex

@article{b6cb0df4c0974eeda85d89b1c047b508,
title = "Proton interactions with soil organic matter ; the importance of aggregation and the weak acids of humin.",
abstract = "Samples of three organic-rich soils (ombrotrophic peat, podzol H-horizon, humic ranker) were extensively washed with dilute nitric acid, dialysed against deionised water, and then subjected to acid-base titrations over the pH range 3–10, in 0.3–300 mm NaNO3, and with soil concentrations in the range 2–150 g l−1. The results for the three soils were quantitatively similar. Comparison of the titration data with previously published results for humic acids isolated from the same soils showed the soil organic matter to have a greater ionic strength dependency of proton binding and to possess relatively greater buffering capacity at high pH, attributable to weak acid groups (c. 2–5 mmol g–1) in the humin fraction of the soils. To describe the soil titration data quantitatively, we modified Humic Ion-Binding Model VI-FD, which utilizes a fixed Donnan volume to describe counterion accumulation, by increasing the content of weak acid groups. When artefacts in pH measurement caused by the suspension effect were taken into account, the resulting Model VI-FD2 provided good or fair simulations of all the titration data. The results suggest that soil structure, specifically aggregation, plays a significant role in cation binding by organic soils in situ. The lack of dependence of the titration results on soil suspension concentration suggests that the findings can be applied to soils in situ.",
author = "Cooke, {James D.} and Edward Tipping and John Hamilton-Taylor",
year = "2008",
month = dec,
doi = "10.1111/j.1365-2389.2008.01071.x",
language = "English",
volume = "59",
pages = "1111--1121",
journal = "European Journal of Soil Science",
issn = "1351-0754",
publisher = "Wiley-Blackwell",
number = "6",

}

RIS

TY - JOUR

T1 - Proton interactions with soil organic matter ; the importance of aggregation and the weak acids of humin.

AU - Cooke, James D.

AU - Tipping, Edward

AU - Hamilton-Taylor, John

PY - 2008/12

Y1 - 2008/12

N2 - Samples of three organic-rich soils (ombrotrophic peat, podzol H-horizon, humic ranker) were extensively washed with dilute nitric acid, dialysed against deionised water, and then subjected to acid-base titrations over the pH range 3–10, in 0.3–300 mm NaNO3, and with soil concentrations in the range 2–150 g l−1. The results for the three soils were quantitatively similar. Comparison of the titration data with previously published results for humic acids isolated from the same soils showed the soil organic matter to have a greater ionic strength dependency of proton binding and to possess relatively greater buffering capacity at high pH, attributable to weak acid groups (c. 2–5 mmol g–1) in the humin fraction of the soils. To describe the soil titration data quantitatively, we modified Humic Ion-Binding Model VI-FD, which utilizes a fixed Donnan volume to describe counterion accumulation, by increasing the content of weak acid groups. When artefacts in pH measurement caused by the suspension effect were taken into account, the resulting Model VI-FD2 provided good or fair simulations of all the titration data. The results suggest that soil structure, specifically aggregation, plays a significant role in cation binding by organic soils in situ. The lack of dependence of the titration results on soil suspension concentration suggests that the findings can be applied to soils in situ.

AB - Samples of three organic-rich soils (ombrotrophic peat, podzol H-horizon, humic ranker) were extensively washed with dilute nitric acid, dialysed against deionised water, and then subjected to acid-base titrations over the pH range 3–10, in 0.3–300 mm NaNO3, and with soil concentrations in the range 2–150 g l−1. The results for the three soils were quantitatively similar. Comparison of the titration data with previously published results for humic acids isolated from the same soils showed the soil organic matter to have a greater ionic strength dependency of proton binding and to possess relatively greater buffering capacity at high pH, attributable to weak acid groups (c. 2–5 mmol g–1) in the humin fraction of the soils. To describe the soil titration data quantitatively, we modified Humic Ion-Binding Model VI-FD, which utilizes a fixed Donnan volume to describe counterion accumulation, by increasing the content of weak acid groups. When artefacts in pH measurement caused by the suspension effect were taken into account, the resulting Model VI-FD2 provided good or fair simulations of all the titration data. The results suggest that soil structure, specifically aggregation, plays a significant role in cation binding by organic soils in situ. The lack of dependence of the titration results on soil suspension concentration suggests that the findings can be applied to soils in situ.

U2 - 10.1111/j.1365-2389.2008.01071.x

DO - 10.1111/j.1365-2389.2008.01071.x

M3 - Journal article

VL - 59

SP - 1111

EP - 1121

JO - European Journal of Soil Science

JF - European Journal of Soil Science

SN - 1351-0754

IS - 6

ER -