JEQ Journal of Natural Resources and Life Sciences Education
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Published in J. Environ. Qual. 33:406-408 (2004).
© ASA, CSSA, SSSA
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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 Department of Water Resources, St. Johns River Water Management District, P.O. Box 1429, Palatka, FL 32178-1429
b Soil and Water Science Department, University of Florida, Gainesville, FL 32611-0290

* Corresponding author (youyang{at}sjrwmd.com).

Received for publication May 1, 2003. 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.

Abbreviations: HPLC, high performance liquid chromatography • LSC, liquid scintillation counting






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