ORIGINAL RESEARCH
Adsorption of Herbicide Diuron in
Pineapple-Growing Soils of Eastern Thailand
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Department of Soil Science, Faculty of Agriculture, Kasetsart University, Chatuchak,
Bangkok, Thailand
Submission date: 2018-10-13
Final revision date: 2018-12-15
Acceptance date: 2018-12-15
Online publication date: 2019-08-21
Publication date: 2019-10-23
Pol. J. Environ. Stud. 2020;29(1):285-292
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ABSTRACT
Four pineapple-growing soils (topsoil) were collected from Chonburi and Chachoengsao provinces
in Thailand to analyze the physiochemical properties, chemical composition of organic carbon and
diuron adsorption isotherm (batch experiment). Results revealed that diuron adsorption rate of soils
was low (ranging between 1.81 and 27.63%) and adsorption data fit well with Freundlich equation
(R2 = 0.83-0.97), in which the adsorption coefficient (KF) is between 0.57 and 4.87 L kg-1. Soil organic
matter and clay content were responsible for the adsorption of diuron in these soils (r = 0.95** and
0.78**, respectively). In addition, total nitrogen, silt content and cation exchange capacity also had
a positive correlation with diuron adsorption in the soils. Organic carbon partitioning coefficient (KOC)
of soils ranged from 125.84 to 480.36 L kg-1 and showed a positive correlation with the functional group
of organic carbon, including aromatic carbon and carbonyl (r = 0.80** and 0.67*, respectively). This
low rate of diuron adsorption in pineapple-growing soils posed a risk in diuron contamination in the
environment. The increase of organic matter in these soils, particularly those coarse to medium-textured
soils, through proper soil management would increase the herbicide adsorption ability of these soils and
should subsequently reduce the contamination markedly.