Adsorption of 2,4-Dichlorophenoxyacetic acid onto volcanic ash soils: Effects of pH and soil organic matter

Ei Ei Mon, Taiki Hirata, Ken Kawamoto, Syuntaro Hiradate, Toshiko Komatsu, Per Moldrup

Research output: Contribution to journalArticle

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Abstract

The quantification of the linear adsorption coefficient (Kd) for soils plays a vital role to predict fate and transport of pesticides in the soil-water environment. In this study, we measured Kd values for 2,4-Dichlorophenoxyacetic acid (2,4-D) adsorption onto Japanese volcanic ash soils with different amount of soil organic matter (SOM) in batch experiments under different pH conditions. All measurements followed well both linear and Freundlich adsorption isotherms. Strong correlations were found between measured Kd values and pH as well as SOM. The 2,4-D adsorption increased with decreasing pH and with increasing SOM. Based on the data, a predictive Kd equation for volcanic ash soils, log (Kd) = 2.04 - 0.37 pH + 0.91 log (SOM), was obtained by the multiple regression analysis. The predictive Kd equation was tested against measured 2,4-D sorption data for other volcanic ash soils and normal mineral soils from literature. The proposed Kd equation well predicted Kd values for other volcanic ash soils and slightly over- or under-predicted Kd values for normal mineral soils. The proposed Kd equation performed well against volcanic ash soils from different sites and countries, and is therefore recommended for predicting Kd values at different pH and SOM conditions for volcanic ash soils when calculating and predicting 2,4-D mobility and fate in soil and groundwater.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalEnvironmentAsia
Volume2
Issue number1
Publication statusPublished - Jan 1 2009
Externally publishedYes

Fingerprint

Volcanic Eruptions
2,4-Dichlorophenoxyacetic Acid
2,4 dichlorophenoxyacetic acid
volcanic ash
Biological materials
Adsorption
soil organic matter
Soil
adsorption
Soils
soil
effect
Minerals
mineral
multiple regression
regression analysis
isotherm

All Science Journal Classification (ASJC) codes

  • Toxicology
  • Environmental Science(all)

Cite this

Adsorption of 2,4-Dichlorophenoxyacetic acid onto volcanic ash soils : Effects of pH and soil organic matter. / Mon, Ei Ei; Hirata, Taiki; Kawamoto, Ken; Hiradate, Syuntaro; Komatsu, Toshiko; Moldrup, Per.

In: EnvironmentAsia, Vol. 2, No. 1, 01.01.2009, p. 1-9.

Research output: Contribution to journalArticle

Mon, EE, Hirata, T, Kawamoto, K, Hiradate, S, Komatsu, T & Moldrup, P 2009, 'Adsorption of 2,4-Dichlorophenoxyacetic acid onto volcanic ash soils: Effects of pH and soil organic matter', EnvironmentAsia, vol. 2, no. 1, pp. 1-9.
Mon, Ei Ei ; Hirata, Taiki ; Kawamoto, Ken ; Hiradate, Syuntaro ; Komatsu, Toshiko ; Moldrup, Per. / Adsorption of 2,4-Dichlorophenoxyacetic acid onto volcanic ash soils : Effects of pH and soil organic matter. In: EnvironmentAsia. 2009 ; Vol. 2, No. 1. pp. 1-9.
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