Carbendazim sorption-desorption in Vietnamese soils

Area of Science:

• Environmental Chemistry
• Soil Science
• Agrochemicals

Background:

• Pesticide fate in soil is crucial for environmental risk assessment.
• Carbendazim is a widely used fungicide with potential for soil contamination.
• Understanding carbendazim sorption mechanisms is essential for predicting its environmental behavior.

Purpose of the Study:

• To investigate the sorption and desorption characteristics of carbendazim in four Vietnamese soils.
• To determine the influence of soil properties (pH, clay, organic matter) on carbendazim sorption.
• To evaluate the reversibility of carbendazim binding in different soil types.

Main Methods:

• Batch equilibration technique was employed for sorption and desorption studies.
• Four Vietnamese soils with varying pH, clay, and organic matter content were analyzed.
• Carbendazim sorption coefficients (Kd) and organic carbon partition coefficients (Koc) were calculated.

Main Results:

• Carbendazim sorption increased with higher organic carbon (OC) and clay content.
• Acid sulfate soil (CT) exhibited strong sorption and less reversible binding.
• Kd values ranged from 8.1 to 127 ml/g, and Koc values ranged from 960 to 2700 ml/g.
• pH influenced sorption differently: increasing sorption with decreasing pH in sandy soil (ST) and decreasing sorption with decreasing pH in acid sulfate soil (CT).

Conclusions:

• Soil organic carbon and clay content are key factors governing carbendazim sorption.
• Carbendazim binding is strongest and least reversible in acid sulfate soils.
• The impact of pH on carbendazim sorption is soil-specific, highlighting the complexity of pesticide-soil interactions.