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This article in JEQ

  1. Vol. 33 No. 1, p. 406-408
     
    Received: May 1, 2003


    * Corresponding author(s): youyang@sjrwmd.com
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doi:10.2134/jeq2004.4060

A Simple High Performance Liquid Chromatography Method for Analyzing Paraquat in Soil Solution Samples

  1. Ying Ouyang *a,
  2. Robert S. Mansellb and
  3. Peter Nkedi-Kizzab
  1. 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

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 12C (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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Copyright © 2004. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyASA, CSSA, SSSA