TITLE:
Kinetics of Sorption of Pendimethalin on Soil Samples Obtained from the Banks of Rivers Katsina-Ala and Benue, Central Nigeria
AUTHORS:
Justin Kpagh, Rufus Sha’Ato, Raymond A. Wuana, Terrumun A. Tor-Anyiin
KEYWORDS:
Kinetics, Sorption, Pendimethalin, Soil, Nigeria
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.4 No.1,
January
8,
2016
ABSTRACT: Kinetics
of the sorption of the herbicide, pendimethalin (3,4-Dimethyl-2,6-dinitro-N-pentan-3-yl-aniline) on four soil
samples obtained from the banks of Rivers Benue and Katsina-Ala, in Central
Nigeria was studied by contacting 5.0 g soil samples with 100 mL 7 × 10-6 M herbicide solution. The sorption was monitored by following the herbicide
concentration in the aqueous phase spectrophotometrically at one hour intervals
for 5 hours (at 25°C, 35°C, 45°C, 55°C and 65°C, respectively). Pseudo-first
order kinetics treatment of the data showed that sorption rates as well as the
accompanying activation energies were low, indicating that physical adsorption is
the operative mechanism for its retention in the soils and that the herbicide
tended to reside more in the aqueous phase, which raised its potential to
contaminate natural water systems, when applied on the field.