A simple high performance liquid chromatography method for analyzing paraquat in soil solution samples |
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Authors: | Ouyang Ying Mansell Robert S Nkedi-Kizza Peter |
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Institution: | Department of Water Resources, St. Johns River Water Management District, P.O. Box 1429, Palatka, FL 32178-1429, USA. youyang@sjrwmd.com |
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Abstract: | 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 UC (nonradioactive) HPLC method provides an inexpensive and environmentally safe means for determining paraquat concentration in soil solution compared with the 14C-LSC method. |
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