Gas chromatographic determination of flurprimidol in a submersed aquatic plant (Myriophyllum spicatum), soil, and water

Methods for the extraction and quantification of flurprimidol residues in Eurasian watermilfoil (Myriophyllum spicatum), soil, and water are described. The compound was detected and quantified by gas chromatography (GC) with a thermionic specific detector. Its identity was confirmed by gas chromatography-mass spectrometry (GCMS) with detection at m/e 40–320. Recoveries from samples spiked with flurprimidol at 10–10,000 ng ml^–1 or g^–1 averaged 86.8% for Eurasian watermilfoil shoots, 85.2% for roots, 79.3% for loam soil, and 93.3% for water. In a small-scale experiment under field conditions, approximately 88% of the applied flurprimidol dissipated in 4 weeks. The majority of recovered flurprimidol was found in the water and upper 5 cm soil layer. The half-life of the compound in water was 6.8–8 days during June/July 1989.