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.

Estimation of the amounts of allophane and other materials in the clay fraction of an Egmont loam profile and other volcanic ash soils, New Zealand

Soil Research ◽  
1981 ◽  
Vol 19 (3) ◽  
pp. 185 ◽  
Author(s):  
M Russell ◽  
RL Parfitt ◽  
GGC Claridge
Keyword(s):  
Volcanic Ash ◽  
Clay Fraction ◽  
Minor Component ◽  
Selective Dissolution ◽  
The Other ◽  
Absorption Bands ◽  
Different Depths ◽  
Infrared Absorption Bands ◽  
Volcanic Ash Soils ◽  
Good Agreement

The allophane content of the clay fraction of six samples taken at different depths in an Egmont loam profile and samples from three other volcanic ash soils has been determined by acid-oxalate dissolution and infrared spectroscopy and the results from the two methods were in good agreement. The tephra that accumulated during 3500-10000 years B.P. (30-80 cm depth) in the Egmont profile had the highest allophane content (about 70% of the clay fraction). The allophane was identified as the proto-imogolite form of allophane. The allophane content of the clay fraction of the top 10 cm of the profile was lower than that of the underlying horizons, and the clay fraction also contained significant amounts of glass, laminar opaline silica, imogolite, and halloysite. A sample from the lower unit of the profile (below 80 cm), derived from tephric loess, contained about 50% allophane in the clay fraction, together with halloysite, gibbsite, chlorite and quartz. Halloysite was recognized in all the samples from infrared absorption bands at 470, 1035 and 1100 cm-1. These bands were enhanced and the other halloysite bands were observed after allophane was removed by selective dissolution in acid-oxalate. Chlorite appeared to be a common minor component of the clay fractions and probably has an aeolian origin.

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.

scholarly journals Assessment of Riverbed Sediments Originated from Volcanic Ash Soils in Jeju Island

2019 ◽  
Vol 22 (4) ◽  
pp. 303-311
Author(s):  
Ki Moon Bong ◽  
Hae Jong Yang ◽  
Tae-Woo Kang ◽  
Jong Hak Han ◽  
Hyo Jin Jeong ◽  
...  
Keyword(s):  
Volcanic Ash ◽  
Jeju Island ◽  
Riverbed Sediments ◽  
Volcanic Ash Soils

scholarly journals Silicon Fractionation of Soluble Silicon in Volcanic Ash Soils That May Affect Groundwater Silicon Content on Jeju Island, Korea

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2686
Author(s):  
Won-Pyo Park ◽  
Hae-Nam Hyun ◽  
Bon-Jun Koo
Keyword(s):  
Silicon Content ◽  
Volcanic Ash ◽  
Jeju Island ◽  
Sequential Extraction Method ◽  
Amorphous Si ◽  
High Precipitation ◽  
Si Content ◽  
Pedogenic Processes ◽  
Soluble Silicon ◽  
Volcanic Ash Soils

Silicon (Si) is found in various fractions of soil, depending on the pedogenic processes of the environment. Dissolved Si (DSi) is adsorbed in soil particles or leaches through the soil profile into the groundwater. The objective of this study is to quantify, using the sequential extraction method, the different Si fractions in volcanic ash soils on Jeju Island that may affect groundwater Si content, and to compare them with those in forest soils on mainland Korea. Most of the Si in these soils was bound in unavailable forms as primary and secondary silicates. The second largest proportion of Si in the non-Andisols of Jeju Island and Korean mainland soils was accumulated as amorphous Si, while in the Andisols of Jeju Island, the second most significant Si fraction was in pedogenic oxides and hydroxides. The products of these soil formations were short-range-order minerals such as allophane (4–40%). The adsorbed Si concentration tended to increase at lower depths in Andisols (100–1400 mg kg−1) and was approximately five times higher than that in non-Andisols. The results indicate that Si is more soluble in the Andisols of high precipitation regions and that Andisols on Jeju Island potentially affect groundwater Si concentration.

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

scholarly journals Modeling of solid sediment transport in mountain rivers

2020 ◽  
Vol 175 ◽  
pp. 12002 ◽  
Author(s):  
Issam Boukhanef ◽  
Anna Khadzhidi ◽  
Lyudmila Kravchenko ◽  
Zeroual Ayoub ◽  
Kastali Abdennour
Keyword(s):  
Sediment Transport ◽  
Fine Particles ◽  
Agricultural Soils ◽  
Suspended Sediments ◽  
High Water ◽  
The Other ◽  
Concentration Data ◽  
Solid Transport ◽  
One Year ◽  
The One

In Algeria, the problems of erosion and sediment transport are critical, since they have the most dramatic consequences of the degradation of agricultural soils on the one hand and the siltation of the dam on the other .The sediment transport in the Algerian basins is very important especially during the periods of floods, It is in this sense that this study, which consists of estimating the sediment transport in suspension and determining the models of relation linking the liquid discharge and the sediment discharge in order to estimate the solid transport in the absence of suspended sediments concentration data at the Sidi Akkacha station at the outlet of the basin of Oued Allala which is subject to a high water erosion, it degrades from one year to the other under the effect of this phenomenon especially during the floods which drain high amounts of fine particles exceeding in general, the concentration of 150 g/l, the results obtained from the application of the models are very encouraging since the correlation between liquid and solid discharge exceeds 80 %.

Assessment the leaching characteristics and long-term leaching behavior of some radionuclides from synthesized zeolite cement matrix

2021 ◽  
Vol 143 ◽  
pp. 106357
Author(s):  
N.M. Sami ◽  
O.A. Abdel Moamen ◽  
M.I. El-Dessouky ◽  
A.M. El-Kamash
Keyword(s):  
Cement Matrix ◽  
Leaching Behavior ◽  
Leaching Characteristics

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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