An on-line push/pull perfusion-based hollow-fiber liquid-phase microextraction system for high-performance liquid chromatographic determination of alkylphenols in water samples

The Analyst ◽  
2013 ◽  
Vol 138 (11) ◽  
pp. 3271 ◽  
Author(s):  
Yu-Ying Chao ◽  
Zhi-Xuan Jian ◽  
Yi-Ming Tu ◽  
Hsaio-Wen Wang ◽  
Yeou-Lih Huang
Keyword(s):  
Liquid Phase ◽  
Water Samples ◽  
High Performance ◽  
Chromatographic Determination ◽  
High Performance Liquid Chromatographic ◽  
Liquid Phase Microextraction ◽  
On Line ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

High Performance Liquid Chromatographic Determination of Difenzoquat Residues in Water

1982 ◽  
Vol 65 (5) ◽  
pp. 1097-1101
Author(s):  
Ijaz Ahmad
Keyword(s):  
Water Samples ◽  
High Performance ◽  
Tap Water ◽  
Chromatographic Determination ◽  
High Performance Liquid Chromatographic ◽  
Methyl Sulfate ◽  
Liquid Chromatograph ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A simple analytical method is described for the quantitative determination of difenzoquat (1,2- dimethyl-3,5-diphenyl-lH-pyrazolium methyl sulfate) residues in water. The method involves high performance liquid chromatography with ultraviolet detection at 255 nm. The procedure is used to determine 2 ppb to 1 ppm levels of difenzoquat in pure and tap water. Samples which contain ≥50 ppb difenzoquat are injected directly into the liquid chromatograph without prior separation, concentration, or purification. Samples containing ≤50 ppb difenzoquat are first enriched on C18 Sep-Pak reverse phase cartridges and then injected into the liquid chromatograph. Average recoveries of difenzoquat were greater than 92% with a coefficient of variation less than 4.5%. The method can be used for water samples with difenzoquat concentrations as low as 2 ppb.

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