Specific Retention of Radiocesium in Volcanic Ash Soils Devoid of Micaceous Clay Minerals

2004 ◽  
Vol 68 (1) ◽  
pp. 313 ◽  
Author(s):  
Emmanuel Joussein ◽  
Nathalie Kruyts ◽  
Dominique Righi ◽  
Sabine Petit ◽  
Bruno Delvaux
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Specific Retention ◽  
Volcanic Ash Soils

Specific Retention of Radiocesium in Volcanic Ash Soils Devoid of Micaceous Clay Minerals

2004 ◽  
Vol 68 (1) ◽  
pp. 313-319 ◽  
Author(s):  
Emmanuel Joussein ◽  
Nathalie Kruyts ◽  
Dominique Righi ◽  
Sabine Petit ◽  
Bruno Delvaux
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Specific Retention ◽  
Volcanic Ash Soils

CLAY MINERALS OF SOME WELL-DRAINED VOLCANIC ASH SOILS IN JAPAN

Soil Science ◽  
1955 ◽  
Vol 79 (5) ◽  
pp. 349-358 ◽  
Author(s):  
SHIGENORI AOMINE ◽  
NAGANORI YOSHINAGA
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Volcanic Ash Soils

scholarly journals Silicon and Aluminum Mobility in Soils of Jeju Island, Korea

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Won-Pyo Park ◽  
Bon-Jun Koo
Keyword(s):  
Clay Minerals ◽  
Volcanic Ash ◽  
Jeju Island ◽  
Annual Precipitation ◽  
Mean Annual Precipitation ◽  
Soil Series ◽  
High Concentration ◽  
Volcanic Ash Soil ◽  
Low Altitude ◽  
Volcanic Ash Soils

The objective of the study is to investigate the effect of released silicon (Si) and aluminum (Al) during the formation of volcanic ash soil on the content of Si in groundwater on Jeju Island. Volcanic ash soils in Jeju Island were formed from pyroclastic materials that originated from basalt. We sampled four profiles, including basaltic bedrock of each soil series with large variations in elevation (160–320 m) and mean annual precipitation (MAP; 1,800–2,600 mm). The soil and bedrock minerals were analyzed for weathering of volcanic ash soils related to mineralogical transformations and mobility of Si and Al. Andisols (above 2,000 mm MAP) were dominantly composed of allophane and gibbsite. In Andisols used in the study, 10–70% of Si was lost, whereas the amount of Al was relatively conserved. This is because Al forms Al-humus complex and Andisols contain allophane. In contrast, non-Andisols located at low altitude with lower than 1,800 mm MAP were enriched with considerable amounts of Si and Al, because non-Andisols have crystalline clay minerals and quartz. These results indicate that Andisols, which are widely distributed in Jeju Island, may play an important role in contributing to the high concentration of dissolved Si in the groundwater.

Surface properties and clay mineralogy of hydrated halloysitic soil clays. II: Evidence for the presence of halloysite/smectite (H/Sm) mixed-layer clays

Clay Minerals ◽  
1990 ◽  
Vol 25 (2) ◽  
pp. 141-160 ◽  
Author(s):  
B. Delvaux ◽  
A. J. Herbillon ◽  
L. Vielvoye ◽  
M. M. Mestdagh
Keyword(s):  
Clay Minerals ◽  
Surface Properties ◽  
Mixed Layer ◽  
Volcanic Ash ◽  
Clay Mineralogy ◽  
Soil Weathering ◽  
Soil Clays ◽  
Mixed Layers ◽  
Exchange Selectivity ◽  
Volcanic Ash Soils

AbstractSix clays from volcanic ash soils at different stages of weathering differ in their relative halloysite content with respect to kaolinite and several surface properties, namely CEC, and exchange selectivity for K+. These three parameters are related to each other in that they all decrease with increasing soil weathering stage. XRD data show that the hydrated 1:1 layer-silicates in these clays combine with smectite to form interstratified H/Sm clay minerals. In these mixed-layers, the content and layer charge of smectitic units decrease as the relative halloysite content in the clay decreases. These clays thus depict a weathering sequence that is parallel to the weathering sequence of the soils from which they originate. It is also shown that the smectites in the H/Sm minerals have the distinctive composition and ESR spectrum of Fe-rich 2:1 clay minerals belonging to the beidellite-nontronite series. The information obtained explains why these clays have high CEC and distinct affinities for K+. It is hoped that this study will help to clarify the controversy concerning the CEC and related surface properties attributed to hydrated halloysite.

scholarly journals Sorption and leaching characteristics of pesticides in volcanic ash soils of Jeju Island, Korea

2020 ◽  
Vol 63 (1) ◽  
Author(s):  
Won-Pyo Park ◽  
Kong-Man Chang ◽  
Hae-Nam Hyun ◽  
Kyung-Hwan Boo ◽  
Bon-Jun Koo
Keyword(s):  
Volcanic Ash ◽  
Agricultural Soils ◽  
Distribution Coefficients ◽  
The Other ◽  
Jeju Island ◽  
European Standard ◽  
Leaching Behavior ◽  
Mobility Assessment ◽  
Leaching Characteristics ◽  
Volcanic Ash Soils

Abstract It is important to evaluate leaching behavior in agricultural soils to prevent the pollution of groundwater by pesticides. We identified the distribution coefficients (Kd) of ten pesticides with different physicochemical properties and compared their leaching characteristics using wick lysimeters from three distinct soil types on Jeju Island. The Kd values varied by pesticide and soil, but were within the range of 1.2 to 4231 L kg−1. Based on the European standard (Kd < 10 L kg−1), six pesticides (alachlor, ethoprophos, carbofuran, napropamide, tebuconazole, and etridiazole) were mobile in at least one tested soil, and their soil organic carbon affinity was ≤ 5.811. This value differed greatly from the other pesticides (16.533 and higher). The solubility of the six mobile pesticides was ≥ 32 mg L−1, which substantially differed from the other pesticides (≤ 0.71 mg L−1). Thus, we conclude that our mobility assessment, which is based on Kd values, can be used to predict the leaching of pesticides in the volcanic ash soils of Jeju Island. The use of pesticides should be strictly controlled to reduce the possibility of groundwater contamination.

Aluminum concentrations in sclerotia from a buried humic horizon of volcanic ash soils in Mt. Myoko, Central Japan

2001 ◽  
Vol 47 (2) ◽  
pp. 411-418 ◽  
Author(s):  
Makiko Watanabe ◽  
Nobuhide Fujitake ◽  
Hiroyuki Ohta ◽  
Takushi Yokoyama
Keyword(s):  
Volcanic Ash ◽  
Central Japan ◽  
Humic Horizon ◽  
Volcanic Ash Soils

Models relating soil pH measurements in H2O, KCl and CaCl2 for volcanic ash soils of Cameroon

2018 ◽  
Vol 14 ◽  
pp. e00185 ◽  
Author(s):  
Georges Kogge Kome ◽  
Roger Kogge Enang ◽  
Bernard Palmer Kfuban Yerima ◽  
Meli Gilles Raoul Lontsi
Keyword(s):  
Soil Ph ◽  
Volcanic Ash ◽  
Ph Measurements ◽  
Volcanic Ash Soils
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