Optimization of the Separation, Isolation and Recovery of Selected Pesticides in Water Samples by Solid-Phase Extraction and HPLC Photodiode Array Detection

1993 ◽  
Vol 16 (18) ◽  
pp. 4019-4029 ◽  
Author(s):  
P. Parrilla ◽  
J. L. Martinez-Vtdal ◽  
A. R. Fernandez-Alba
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phase Extraction ◽  
Photodiode Array Detection ◽  
Pesticides In Water ◽  
Photodiode Array ◽  
Array Detection

scholarly journals Preparation of Environmental Samples for Determination of Sulfonylurea Herbicides by Solid-Phase Extraction Using a Polymeric Sorbent

1998 ◽  
Vol 81 (1) ◽  
pp. 99-104 ◽  
Author(s):  
Michael S Young
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Rapid Determination ◽  
Phase Extraction ◽  
Sulfonylurea Herbicides ◽  
Photodiode Array Detection ◽  
Polymeric Sorbents ◽  
Photodiode Array ◽  
Array Detection

Abstract An analytical procedure was developed for rapid determination of sulfonylurea herbicides in water or soil. Samples were prepared by solid-phase extraction using polymeric sorbents in cartridges and analyzed by liquid chromatography with photodiode array detection. Recoveries were consistent for all sample matrixes tested and were generally >85%, except for tribenuron methyl (75%). Detection limits were <100 ng/L for water samples

Analysis of supplemented vitamin K1(20) in serum microsamples by solid-phase extraction and narrow-bone HPLC with multichannel ultraviolet detection.

1989 ◽  
Vol 35 (7) ◽  
pp. 1288-1292 ◽  
Author(s):  
E M Kirk ◽  
A F Fell
Keyword(s):  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Reversed Phase ◽  
Phase Extraction ◽  
Calibration Data ◽  
Vitamin K1 ◽  
Photodiode Array Detection ◽  
Photodiode Array ◽  
Array Detection

Abstract A sensitive method for the determination of vitamin K1(20) in serum microsamples (50 microL) has been developed, utilizing solid-phase extraction with C8 Bond-Elut columns and reversed-phase narrow-bore high-performance liquid chromatography [2.1 mm (i.d.), column] with a nonaqueous eluent. Recovery from serum (49 ng/mL) was 76% (n = 2). Peak homogeneity was assessed by photodiode array detection with absorbance ratio, spectral normalization, and transformation to the first- and second-derivative chromatograms. Calibration data at 248 nm over two ranges (20-200 ng/mL, 200-4000 ng/mL) varied linearly with concentration and were suitable for studies of vitamin K1 supplementation. By comparison with conventional columns, sensitivity was increased twofold.

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