A Simple High Performance Liquid Chromatography Method for Analyzing Paraquat in Soil Solution Samples
- Ying Ouyang *a,
- Robert S. Mansellb and
- Peter Nkedi-Kizzab
A high performance liquid chromatography (HPLC) method with UV detection was developed to analyze paraquat (1,1′-dimethyl-4,4′-dipyridinium dichloride) herbicide content in soil solution samples. The analytical method was compared with the liquid scintillation counting (LSC) method using 14C-paraquat. Agreement obtained between the two methods was reasonable. However, the detection limit for paraquat analysis was 0.5 mg L−1 by the HPLC method and 0.05 mg L−1 by the LSC method. The LSC method was, therefore, 10 times more precise than the HPLC method for solution concentrations less than 1 mg L−1 In spite of the high detection limit, the 12C (nonradioactive) HPLC method provides an inexpensive and environmentally safe means for determining paraquat concentration in soil solution compared with the 14C-LSC method.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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