CHROMATOGRAPHY, Vol. 33 (2012), No. 3, pp. -191

大容量試料導入—高速液体クロマトグラフィー法を用いる水道中ジクワットの迅速分析
Rapid Determination of Diquat in Tap Water by HPLC with Large-Volume Sample Injection

Solid-phase extraction/HPLC method had been commonly used for the determination of diquat as a herbicide in tap water. Though the concentration of diquat in the drinking water was can be quantitatively determined down to only 1/5 of the target value adopted in water quality management (0.005 mg/L). However, simple and quick measurement was achieved by injecting a 500 μL-volume of sample solution onto a HPLC column instead of the solid-phase extraction commonly used for diquat analysis. The signal-to-noise ratio for concentration at 50 μg/ L of the target value was 10 or greater, with the repeatability with 6.7% as RSD, and the sensitivity and repeatability were both satisfactory. In spike recovery tests using mineral water and tap water, the recovery was almost 100% for a diquat at a concentration of 0.0005 mg/L.