Adsorption study of 14C-paraquat in two Malaysian agricultural soils

Halimah Muhamad, Ismail Sahid, Mehdi Sameni, Nashriyah Mat

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The adsorption equilibrium time and effects of pH and concentration of 14C-labeled paraquat (1,1′-dimethyl-4,4′-bipyridylium dichloride) in two types of Malaysian soil were investigated. The soils used in the study were clay loam and clay soils from rice fields. Equilibrium studies of paraquat in a soil and pesticide solution were conducted. Adsorption equilibrium time was achieved within 2 h for both soil types. The amount of 14C-labeled paraquat adsorbed onto glass surfaces increased with increasing shaking time and remained constant after 10 h. It was found that paraquat adsorbed by the two soils was very similar: 51.73 (clay loam) and 51.59 μ g g-1 (clay) at 1 μ g/ml. The adsorption of paraquat onto both types of soil was higher at high pH, and adsorption decreased with decreasing pH. At pH 11, the amounts of 14C-labeled paraquat adsorbed onto the clay loam and clay soil samples were 4.08 and 4.05 μ g g -1, respectively, whereas at pH 2, the amounts adsorbed were 3.72 and 3.57 μ g g-1, respectively. Results also suggested that paraquat sorption by soil is concentration dependent.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalEnvironmental Monitoring and Assessment
Volume176
Issue number1-4
DOIs
Publication statusPublished - May 2011

Fingerprint

paraquat
agricultural soil
adsorption
Soils
Adsorption
Clay
clay loam
soil
clay soil
paddy field
soil type
Pesticides
sorption
pesticide
glass
Sorption
clay
Glass

Keywords

  • Adsorption
  • Concentration
  • Equilibrium time
  • Paraquat
  • pH

ASJC Scopus subject areas

  • Environmental Science(all)
  • Management, Monitoring, Policy and Law
  • Pollution

Cite this

Adsorption study of 14C-paraquat in two Malaysian agricultural soils. / Muhamad, Halimah; Sahid, Ismail; Sameni, Mehdi; Mat, Nashriyah.

In: Environmental Monitoring and Assessment, Vol. 176, No. 1-4, 05.2011, p. 43-50.

Research output: Contribution to journalArticle

Muhamad, Halimah ; Sahid, Ismail ; Sameni, Mehdi ; Mat, Nashriyah. / Adsorption study of 14C-paraquat in two Malaysian agricultural soils. In: Environmental Monitoring and Assessment. 2011 ; Vol. 176, No. 1-4. pp. 43-50.
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