Sorption of acidic organic solute onto kaolinitic soils from methanol-water mixtures

Juhee Kim, Minhee Kim, Seunghun Hyun, Jeong-Gyu Kim, Yong Sik Ok

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15 Citations (Scopus)

Abstract

The fate of the acidic organic solute from the soil-water-solvent system is not well-understood. In this study, the effect of the acidic functional group of organic solute in the sorption from cosolvent system was evaluated. The sorption of naphthalene (NAP) and 1-naphthoic acid (1-NAPA) by three kaolinitic soils and two model sorbents (kaolinite and humic acid) were measured as functions of the methanol volume fractions (f c ≤ 0.4) and ionic compositions (CaCl 2 and KCl). The solubility of 1-NAPA was also measured in various ionic compositions. The sorption data were interpreted using the cosolvency-induced sorption model. The K m values (= the linear sorption coefficient) of NAP with kaolinitic soil for both ionic compositions was log linearly decreased with f c. However, the K m values of 1-NAPA with both ionic compositions remained relatively constant over the f c range. For the model sorbent, the K m values of 1-NAPA with kaolinite for the KCl system and with humic acid for both ionic compositions decreased with f c, while the sorption of 1-NAPA with kaolinite for the CaCl 2 system was increased with f c. From the solubility data of 1-NAPA with f c, no significant difference was observed with the different ionic compositions, indicating an insignificant change in the aqueous activity of the liquid phase. In conclusion, the enhanced 1-NAPA sorption, greater than that predicted from the cosolvency-induced model, was due to an untraceable interaction between the carboxylate and hydrophilic soil domain in the methanol-water system. Therefore, in order to accurately predict the environmental fate of acidic pesticides and organic solutes, an effort to quantitatively incorporate the enhanced hydrophilic sorption into the current cosolvency-induced sorption model is required.

Original languageEnglish
Pages (from-to)22-29
Number of pages8
JournalJournal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes
Volume47
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1

Fingerprint

kaolinitic soils
sorption
solutes
Methanol
Sorption
methanol
Soil
Soils
Water
Kaolin
Acids
acids
Kaolinite
water
Humic Substances
kaolinite
Chemical analysis
Solubility
naphthalene
adsorbents

Keywords

  • 1-Napthoic acid
  • cosolvency
  • kaolinitic soil
  • sorption

ASJC Scopus subject areas

  • Food Science
  • Pollution
  • Medicine(all)

Cite this

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title = "Sorption of acidic organic solute onto kaolinitic soils from methanol-water mixtures",
abstract = "The fate of the acidic organic solute from the soil-water-solvent system is not well-understood. In this study, the effect of the acidic functional group of organic solute in the sorption from cosolvent system was evaluated. The sorption of naphthalene (NAP) and 1-naphthoic acid (1-NAPA) by three kaolinitic soils and two model sorbents (kaolinite and humic acid) were measured as functions of the methanol volume fractions (f c ≤ 0.4) and ionic compositions (CaCl 2 and KCl). The solubility of 1-NAPA was also measured in various ionic compositions. The sorption data were interpreted using the cosolvency-induced sorption model. The K m values (= the linear sorption coefficient) of NAP with kaolinitic soil for both ionic compositions was log linearly decreased with f c. However, the K m values of 1-NAPA with both ionic compositions remained relatively constant over the f c range. For the model sorbent, the K m values of 1-NAPA with kaolinite for the KCl system and with humic acid for both ionic compositions decreased with f c, while the sorption of 1-NAPA with kaolinite for the CaCl 2 system was increased with f c. From the solubility data of 1-NAPA with f c, no significant difference was observed with the different ionic compositions, indicating an insignificant change in the aqueous activity of the liquid phase. In conclusion, the enhanced 1-NAPA sorption, greater than that predicted from the cosolvency-induced model, was due to an untraceable interaction between the carboxylate and hydrophilic soil domain in the methanol-water system. Therefore, in order to accurately predict the environmental fate of acidic pesticides and organic solutes, an effort to quantitatively incorporate the enhanced hydrophilic sorption into the current cosolvency-induced sorption model is required.",
keywords = "1-Napthoic acid, cosolvency, kaolinitic soil, sorption",
author = "Juhee Kim and Minhee Kim and Seunghun Hyun and Jeong-Gyu Kim and Ok, {Yong Sik}",
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T1 - Sorption of acidic organic solute onto kaolinitic soils from methanol-water mixtures

AU - Kim, Juhee

AU - Kim, Minhee

AU - Hyun, Seunghun

AU - Kim, Jeong-Gyu

AU - Ok, Yong Sik

PY - 2012/1/1

Y1 - 2012/1/1

N2 - The fate of the acidic organic solute from the soil-water-solvent system is not well-understood. In this study, the effect of the acidic functional group of organic solute in the sorption from cosolvent system was evaluated. The sorption of naphthalene (NAP) and 1-naphthoic acid (1-NAPA) by three kaolinitic soils and two model sorbents (kaolinite and humic acid) were measured as functions of the methanol volume fractions (f c ≤ 0.4) and ionic compositions (CaCl 2 and KCl). The solubility of 1-NAPA was also measured in various ionic compositions. The sorption data were interpreted using the cosolvency-induced sorption model. The K m values (= the linear sorption coefficient) of NAP with kaolinitic soil for both ionic compositions was log linearly decreased with f c. However, the K m values of 1-NAPA with both ionic compositions remained relatively constant over the f c range. For the model sorbent, the K m values of 1-NAPA with kaolinite for the KCl system and with humic acid for both ionic compositions decreased with f c, while the sorption of 1-NAPA with kaolinite for the CaCl 2 system was increased with f c. From the solubility data of 1-NAPA with f c, no significant difference was observed with the different ionic compositions, indicating an insignificant change in the aqueous activity of the liquid phase. In conclusion, the enhanced 1-NAPA sorption, greater than that predicted from the cosolvency-induced model, was due to an untraceable interaction between the carboxylate and hydrophilic soil domain in the methanol-water system. Therefore, in order to accurately predict the environmental fate of acidic pesticides and organic solutes, an effort to quantitatively incorporate the enhanced hydrophilic sorption into the current cosolvency-induced sorption model is required.

AB - The fate of the acidic organic solute from the soil-water-solvent system is not well-understood. In this study, the effect of the acidic functional group of organic solute in the sorption from cosolvent system was evaluated. The sorption of naphthalene (NAP) and 1-naphthoic acid (1-NAPA) by three kaolinitic soils and two model sorbents (kaolinite and humic acid) were measured as functions of the methanol volume fractions (f c ≤ 0.4) and ionic compositions (CaCl 2 and KCl). The solubility of 1-NAPA was also measured in various ionic compositions. The sorption data were interpreted using the cosolvency-induced sorption model. The K m values (= the linear sorption coefficient) of NAP with kaolinitic soil for both ionic compositions was log linearly decreased with f c. However, the K m values of 1-NAPA with both ionic compositions remained relatively constant over the f c range. For the model sorbent, the K m values of 1-NAPA with kaolinite for the KCl system and with humic acid for both ionic compositions decreased with f c, while the sorption of 1-NAPA with kaolinite for the CaCl 2 system was increased with f c. From the solubility data of 1-NAPA with f c, no significant difference was observed with the different ionic compositions, indicating an insignificant change in the aqueous activity of the liquid phase. In conclusion, the enhanced 1-NAPA sorption, greater than that predicted from the cosolvency-induced model, was due to an untraceable interaction between the carboxylate and hydrophilic soil domain in the methanol-water system. Therefore, in order to accurately predict the environmental fate of acidic pesticides and organic solutes, an effort to quantitatively incorporate the enhanced hydrophilic sorption into the current cosolvency-induced sorption model is required.

KW - 1-Napthoic acid

KW - cosolvency

KW - kaolinitic soil

KW - sorption

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JO - Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes

JF - Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes

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