The Experts below are selected from a list of 34731 Experts worldwide ranked by ideXlab platform

Tajana Vučetić - One of the best experts on this subject based on the ideXlab platform.

  • Cation Exchange Capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia
    Central European Journal of Geosciences, 2013
    Co-Authors: Nenad Tomašić, Štefica Kampić, Iva Juranović Cindrić, Kristina Pikelj, Mavro Lučić, Danijela Mavrić, Tajana Vučetić
    Abstract:

    The adsorption properties in terms of Cation Exchange Capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation Exchange Capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation Exchange Capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmolc/kg in soil, from 7 to 15 cmolc/kg in the soil-loess transition zone, and from 12 to 20 cmolc/kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (

  • Cation Exchange Capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia
    Central European Journal of Geosciences, 2013
    Co-Authors: Nenad Tomašić, Štefica Kampić, Iva Juranović Cindrić, Kristina Pikelj, Mavro Lučić, Danijela Mavrić, Tajana Vučetić
    Abstract:

    The adsorption properties in terms of Cation Exchange Capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation Exchange Capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation Exchange Capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmol_ c /kg in soil, from 7 to 15 cmol_ c /kg in the soil-loess transition zone, and from 12 to 20 cmol_ c /kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (

Nenad Tomašić - One of the best experts on this subject based on the ideXlab platform.

  • Cation Exchange Capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia
    Central European Journal of Geosciences, 2013
    Co-Authors: Nenad Tomašić, Štefica Kampić, Iva Juranović Cindrić, Kristina Pikelj, Mavro Lučić, Danijela Mavrić, Tajana Vučetić
    Abstract:

    The adsorption properties in terms of Cation Exchange Capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation Exchange Capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation Exchange Capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmolc/kg in soil, from 7 to 15 cmolc/kg in the soil-loess transition zone, and from 12 to 20 cmolc/kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (

  • Cation Exchange Capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia
    Central European Journal of Geosciences, 2013
    Co-Authors: Nenad Tomašić, Štefica Kampić, Iva Juranović Cindrić, Kristina Pikelj, Mavro Lučić, Danijela Mavrić, Tajana Vučetić
    Abstract:

    The adsorption properties in terms of Cation Exchange Capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation Exchange Capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation Exchange Capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmol_ c /kg in soil, from 7 to 15 cmol_ c /kg in the soil-loess transition zone, and from 12 to 20 cmol_ c /kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (

Reiner Dohrmann - One of the best experts on this subject based on the ideXlab platform.

  • Cation Exchange Capacity methodology ii a modified silver thiourea method
    Applied Clay Science, 2006
    Co-Authors: Reiner Dohrmann
    Abstract:

    Abstract The silver–thiourea method for the determination of the Cation Exchange Capacity (CEC) has been critically examined. The chemical instability of the Exchange solution used causes silver sulphide precipitation on the walls of tubes resulting in a loss of the index Cation. This produces misinterpretation and yields usually in an overestimation of the CEC. Furthermore, when expandable clay minerals are investigated excess adsorption occurs leading to unreliable CEC results dependent on solution/solid ratio and ionic strength of the Exchange solution. A modified silver–thiourea method is proposed, which uses a chemically more stable Exchange solution, eliminating silver sulphide precipitation and substantially lowering excess adsorption, which is abolished by additional washings. The results are comparable to the ammonium acetate method.

  • Cation Exchange Capacity methodology i an efficient model for the detection of incorrect Cation Exchange Capacity and Exchangeable Cation results
    Applied Clay Science, 2006
    Co-Authors: Reiner Dohrmann
    Abstract:

    Abstract In this study a model is proposed enabling the detection of incorrect Cation Exchange Capacity (CEC) and Exchangeable Cation values. Numerous CEC and Exchangeable Cation analyses of clayey sediments, soils and bentonites were performed using triethanolamine-buffered barium chloride, ammonium acetate, silver thiourea and other Exchange techniques. As long as these naturally clayey materials only contain adsorbents like clay minerals, organic substances and a group of mainly detrital minerals like quartz, feldspar and mica, results obtained with most procedures are correct. Problems arise when materials contain secondary phases like soluble Ca-carbonates and -sulphates. During the CEC-experiments, these phases interact with the Exchange solution. According to expectations, results of Exchangeable calcium values are incorrect but CEC is also affected [Deller, B., 1981. Determination of Exchangeable acidity, carbonate ions and change of buffer in triethanolamine-buffered solutions percolated through soil samples containing carbonates. Commun. Soil Sci. Plant Analysis 12, 161–177.]. Using the proposed Carbonate and Sulphate Field Model (CSF model) an evaluation of the accuracy of results is possible.

Yin Cheng - One of the best experts on this subject based on the ideXlab platform.

  • effect of Cation Exchange Capacity of soil on stabilized soil strength
    Soils and Foundations, 2014
    Co-Authors: Xin Huang, Jianguo Ning, Baolin Zhu, Yin Cheng
    Abstract:

    Abstract While a certain correlation between the Cation Exchange Capacity (CEC) of the soil and the strength of the cement stabilized soil has been reported, the mechanism remains unclear. In this research, a set of soil samples with different CECs were stabilized with different proportions of cement and calcium hydroxide (Ca(OH) 2 , CH). The influence of soil CEC on the strength of the stabilized soil was investigated by analyzing the CH saturation in the pore solution and measuring the strength of the stabilized soil specimens. It is revealed that Cation Exchange in the soil can reduce the CH saturation of the stabilized soil. If the CEC of the soil is too high, the CH in the pore solution of the stabilized soil cannot reach the saturation level, and further Cation Exchange would then consume the Ca 2+ ions which should be originally used to generate calcium silicate hydrate, thus result in the poor strength of the stabilized soil.

Mavro Lučić - One of the best experts on this subject based on the ideXlab platform.

  • Cation Exchange Capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia
    Central European Journal of Geosciences, 2013
    Co-Authors: Nenad Tomašić, Štefica Kampić, Iva Juranović Cindrić, Kristina Pikelj, Mavro Lučić, Danijela Mavrić, Tajana Vučetić
    Abstract:

    The adsorption properties in terms of Cation Exchange Capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation Exchange Capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation Exchange Capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmolc/kg in soil, from 7 to 15 cmolc/kg in the soil-loess transition zone, and from 12 to 20 cmolc/kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (

  • Cation Exchange Capacity of loess and overlying soil in the non-carbonate loess sections, North-Western Croatia
    Central European Journal of Geosciences, 2013
    Co-Authors: Nenad Tomašić, Štefica Kampić, Iva Juranović Cindrić, Kristina Pikelj, Mavro Lučić, Danijela Mavrić, Tajana Vučetić
    Abstract:

    The adsorption properties in terms of Cation Exchange Capacity and their relation to the soil and sediment constituents (clay minerals, Fe-, Mn-, and Al-oxyhydroxides, organic matter) were investigated in loess, soil-loess transition zone, and soil at four loess-soil sections in North-Western Croatia. Cation Exchange Capacity of the bulk samples, the samples after oxalate extraction of Fe, Mn and Al, and after removal of organic matter, as well as of the separated clay fraction, was determined using copper ethylenediamine. Cation Exchange Capacity (pH∼7) of the bulk samples ranges from 5 to 12 cmol_ c /kg in soil, from 7 to 15 cmol_ c /kg in the soil-loess transition zone, and from 12 to 20 cmol_ c /kg in loess. Generally, CEC values increase with depth. Oxalate extraction of Fe, Mn, and Al, and removal of organic matter cause a CEC decrease of 3–38% and 8–55%, respectively, proving a considerable influence of these constituents to the bulk CEC values. In the separated clay fraction (