Tracking chlordane compositional and chiral profiles in soil and vegetation.

Area of Science:

• Environmental Chemistry
• Ecotoxicology
• Plant Science

Background:

• Persistent organic pollutants (POPs) like chlordane pose risks to human health.
• Understanding the environmental fate and transport of chlordane is crucial for risk assessment.
• Investigating chlordane's behavior in soil and plant systems provides insights into its ecological cycling.

Purpose of the Study:

• To investigate the compositional and chiral profiles of weathered chlordane residues in soil and zucchini.
• To elucidate the fate and transport mechanisms of chlordane in a soil-plant system.
• To determine how plant uptake and internal processes affect chlordane's chemical and chiral characteristics.

Main Methods:

• Zucchini plants were grown in chlordane-contaminated soil under controlled greenhouse conditions.
• Soil and plant tissues (roots, stems, leaves, fruit) were analyzed for chlordane content.
• Chiral gas chromatography/ion trap mass spectrometry was used to quantify achiral and chiral chlordane components and their enantiomeric ratios.

Main Results:

• Chlordane concentration was lower in the rhizosphere than in bulk soil, with minimal changes in its component and enantiomeric ratios.
• Significant chlordane levels were found in all plant tissues, with concentrations highest in roots and lowest in fruit.
• Plant tissues exhibited significant shifts in chlordane's compositional and chiral profiles, indicating alterations within the plant.

Conclusions:

• Abiotic processes are the dominant factor in chlordane transport from soil to plants.
• Biotic processes within the plant compartment significantly alter the compositional and chiral profiles of chlordane.
• This study is the first to report the impact of rapid plant-based processes on chlordane's chemical and chiral characteristics.