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Removal Efficiency of the Herbicide Glyphosate in Water Treatment Systems

MD. MOKHLESUR RAHMAN
Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh

JANG-EOK KIM
Department of Agricultural Chemistry, Kyungpook National University,Daegu 702-70 l , Korea

Abstract/ Executive Summary:

A comparative study was performed to assess the effectiveness of water treatment systems for the removal of glyphosate as organic contaminant. In water system, four major treatment processes viz., chlorination, coagulation, ozonation and activated carbon treatment were applied separately. For water chlorination by sodium hypochloride , 90% of glyphosate disappeared. In coagulation process, the elimination of 28% of this herbicide was achieved by the treatment of polyaluminum chloride. During ozone treatment, 42 % of glyphosate degraded but this degradation was accelerated by the addition of hydrogen peroxide. The removal of this herbicide was not remarkable in activated carbon treatment. The association of ozonation with chlorination was considered to be the best tested treatment for pure water production. Therefore, if glyphosate enters into water system as organic contaminant it could be removed effectively by water treatment processes .

Keywords: Glyphosate, Chlorination, Activated carbon, Coagulation, Ozonation, Water system

Location:

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Non-commodity: Performance

Objectives:

The goal of the current study was to assess glyphosate as water treatment systems in terms of efficiency of removal of organic contaminant in water system.

Methodology:

The herbicide glyphosate (99% purity). Sodium hypochlorite (12% NaOCI) . Polyal uminum chloride (17% Al₂0₃) and Granulated activated carbon (GAC) were used. All other chemicals were of reagent grade. Sodium hypochlorite treatment: The aqueous glyphosate solution (1 mg/I) was treated with sodium hypochlorite solution at rates of 2, 5 and 10 mg/I Cl₂ separately and then, they were mixed by jar tester at 100 rpm. After 0.5, l , 2 and 4 h, the treated water samples were collected and then the remaining amount of glyphosate was analyzed by HPLC. The collected water sample was treated with 0.075 M sodium tetraborate (Na₂B₄0₇) followed by the addition of 0.015 M 9-fluorenylmetyl chloroformate for derivatization reaction. After shaking and standing for 30 min, dichloromethane was added for partitioning. After collection of water layer, the concentration of glyphosate was analyzed by a high performance liquid chromatograph (HPLC) equipped with a fluorescence detector (Shimadzu-1OA, Japan) following the method as described by Glass (1983). A fluorescence detector was adjusted at excitation and emission wavelengths of 265 and 315 nm, respectively. A column (NH₂ 5 µm, Merck, Germany) with size of 250 mm (I) x 4 mm (i.d.) was used. The mobile phase was composed of acetonitrile and 0.1 M KH₂P0₄ (50 : 50

Source of Information: J. Asiat. Soc. Bangladesh, Sci, 34(1): 9-16, June 2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From these findings, it is concluded that two treatment approaches viz., ozonation and chlorination are found to be suitable for removing the herbicide glyphosate in water system. Therefore, if glyphosate enters into water system as an organic contaminant, it could be removed effectively by water treatment processes

Knowledge Management: Journal