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Influence of phosphate ions on buffer capacity of soil humic acids

100%

Boguta P., Sokolowska Z.

International Agrophysics

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2012

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tom 26

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nr 1

The object of this study was to determine change of natural buffer capacity of humic acids by strong buffering agents, which were phosphate ions. Studies were carried out on the humic acids extracted from peat soils. Additional information was obtained by determination of water holding capacity, density, ash and pH for peats and optical parameterQ4/6 for humic acids. Humic acid suspensions exhibited the highest buffer properties at low pH and reached maximum at pH ~ 4. Phosphates possessed buffer properties in the pH range from 4.5 to 8.0. The maximum of buffering was at pH~6.8 and increased proportionally with an increase in the concentration of phosphate ions. The study indicated that the presence of phosphate ions may strongly change natural buffer capacity of humic acids by shifting buffering maximum toward higher pH values. Significant correlations were found for the degree of the secondary transformation with both the buffer capacity and the titrant volume used during titration.

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Study on buffering capacity and organic matter of some soil samples from Rungicherra Tea-Estate, Bangladesh

100%

Zamir R., Islam N., Hossain M. F.

International Letters of Natural Sciences

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2015

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tom 44

In this study, soil samples from three different hills of three topographic positions were evaluated on the basis of buffer capacity and organic matter. Maximum soil samples were found to have good buffer capacity where soil samples of topographical positions hill base and hill top showed maximum and minimum values respectively, leaving hill slope samples in medium value of buffer capacity. Our study suggested this variation of buffer capacity may be due to the differences of organic matter amongst the topographical positions and profiles.

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Wartosc pH, pojemnosc buforowa i emisja formaldehydu z wiorow z recyklingu

80%

Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie

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1996

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tom 37

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nr 3

185-186

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Południowopodlaska Lowland ecosystem soil buffer capacity

80%

Raczuk J.

Electronic Journal of Polish Agricultural Universities. Series Agronomy

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2001

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tom 04

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nr 1

The paper presents the results of research on soil buffer capacity in Południowopodlaska Lowland ecosystems. The buffer curves were sketched and soil buffer areas measured with planimeter. The data obtained were compared with some soil physical and chemical properties using statistical methods. The greatest acid buffer capacity was observed in highly base-saturated meadow ecosystem soils (VCEB = 82.8 - 98.7%), while the greatest alkali buffer capacity low base-saturated soils of forest ecosystems (VCEB = 10.8 - 49.5%). Upper horizons of arable land soils showed a greater alkali rather than acid buffer capacity, while soil buffer capacity of deeper mineral horizons changed with soil physical and chemical properties.

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Acidification and buffer capacity of bark in five deciduous plants from the region of Split [Croatia]

80%

Bacic T., Ruscic M.

Acta Biologica Cracoviensia. Series Botanica

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1994

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tom 36

Acidification and buffer capacity of bark in five deciduous Mediterranean plants were analyzed. The material originated from six stands with different levels of hovered dust, chiefly cement particles; its pH values were in general higher as compared with some other areas in Europe and Croatia. Quantitative data indicate a tendency of acidity to decrease in stands polluted with more than 200 µg/cm3 of hovered dust. Buffer capacities as a rule were higher against alkali and in particular species were ranging contrary to the range of ph values. The results are interpreted in favour of alkaline atmosphere influence.

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Juniperus communis L. w warunakach środowiska skażonego przez emisje przemysłowe

61%

Lukasik I.

Acta Biologica Silesiana

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1990

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tom 16

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Acta Biologica Silesiana

1 Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie

1 Electronic Journal of Polish Agricultural Universities. Series Agronomy

1 International Agrophysics

1 International Letters of Natural Sciences

1 Bacic T.

1 Boguta P.

1 Hossain M. F.

1 Islam N.

1 Lukasik I.

1 Raczuk J.

1 Ruscic M.

1 Sokolowska Z.

1 Zamir R.

1 2015

1 2012

1 2001

1 1996