Adsorption and desorption of paraquat in two Malaysian agricultural soils

S. Mehdi, M. Halimah, M. Nashriyah, Ismail Sahid

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The adsorption and desorption of paraquat (1, l'-dimethyl-4,4'-dipyridylium dichloride) in two tropical soils was determined under laboratory conditions. The two soils were taken from rice fields located in the North West of Perak state. The adsorption equilibrium time was 2 hours for both soil types. This adsorption equilibrium time was used to determine the effect of concentration on adsorption. The high Freundlich adsorption distribution coefficients Kf for paraquat of 321.91 L/kg and 325.66 L/kg were obtained in the clay loam and clay soils, respectively. The adsorption coefficient (Kd) of clay loam and clay soil were found to be 885.53 L/kg and 772.40 L/kg with solution concentration of 100 μg/L and soil-solution ratio (1:5) at 30°C. The mechanism of adsorption of paraquat involves ionic and charge transfer bonds and the Koc value of the herbicide may therefore not be applicable. Low desorption was recorded in the clay loam and clay soils after the first desorption process (35%). Subsequent desorption processes, however, failed to displace the paraquat cation from either type of soil. The adsorption of paraquat was not affected by temperature (30°C/ 40°C).

Original languageEnglish
Pages (from-to)555-560
Number of pages6
JournalAmerican-Eurasian Journal of Sustainable Agriculture
Volume3
Issue number3
Publication statusPublished - May 2009

Fingerprint

Paraquat
paraquat
agricultural soils
desorption
Adsorption
adsorption
Soil
clay loam soils
clay soils
soil types
tropical soils
Herbicides
soil solution
paddies
clay
Cations
cations
herbicides
Temperature

Keywords

  • Adsorption
  • Desorption
  • Paraquat
  • Soil
  • Temperature

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Food Science
  • Horticulture

Cite this

Adsorption and desorption of paraquat in two Malaysian agricultural soils. / Mehdi, S.; Halimah, M.; Nashriyah, M.; Sahid, Ismail.

In: American-Eurasian Journal of Sustainable Agriculture, Vol. 3, No. 3, 05.2009, p. 555-560.

Research output: Contribution to journalArticle

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