Natural and artificial radioactivity in volcanic ash soils of Jeju Island, Republic of Korea, and assessment of the radiation hazards: importance of soil properties

2020 ◽  
Vol 323 (3) ◽  
pp. 1113-1124 ◽  
Author(s):  
Tae-Woo Kang ◽  
Won-Pyo Park ◽  
Young-Un Han ◽  
Ki Moon Bong ◽  
Kyunghyun Kim
Keyword(s):  
Soil Properties ◽  
Volcanic Ash ◽  
Jeju Island ◽  
Republic Of Korea ◽  
Radiation Hazards ◽  
Artificial Radioactivity ◽  
Natural And Artificial Radioactivity ◽  
Volcanic Ash Soils

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.

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.

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