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Sensitive determination of diquat by a kinetic method using the stopped-flow mixing technique
T Pérez-Ruiz1, C Martínez-Lozano, V Tomás
1Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, 30071 Murcia, Spain. tpr@fcu.um.es
The Analyst
|February 24, 2001
Summary
A new assay accurately measures diquat herbicide using sodium dithionite reduction, offering a fast and inexpensive method for environmental and agricultural analysis.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- Diquat is a widely used herbicide requiring accurate quantification.
- Existing methods for diquat determination may be complex or costly.
Purpose of the Study:
- To develop a simple, sensitive, selective, fast, and inexpensive assay for diquat determination.
- To enable automated analysis of diquat in various sample types.
Main Methods:
- Utilized the reduction of diquat to a fluorescent monocation radical using sodium dithionite.
- Employed stopped-flow mixing technique for rapid kinetic data acquisition.
- Established a linear calibration graph over a concentration range of 5-500 ng ml-1.
Main Results:
- The assay demonstrated high sensitivity and selectivity for diquat.
- The reaction rate was directly proportional to diquat concentration.
- Achieved high precision with a relative standard deviation (RSD) of approximately 1.2%.
Conclusions:
- The proposed assay is a viable, cost-effective method for diquat quantification.
- The method's speed and automation potential make it suitable for routine analysis.
- Demonstrated applicability in determining diquat in diverse sample matrices.