Quantitation of pesticide residues on thin layer chromatograms by video densitometry

Author

Aldridge, Paul K. ; Lee, Mee Hye ; Callis, James B. ; Burns, David H.

Author_Institution

Washington Univ., Seattle, WA, USA

fYear

1989

fDate

9-12 Nov 1989

Firstpage

1670

Abstract

A method is described for analysis of chlorinated pesticides using inexpensive thin-layer plates with quantitation by means of digital image processing. Several organo-halide pesticides, which are classified as priority pollutants, are separated on silica thin-layer chromatographic (TLC) plates using various solvents. The separated pesticide spots are stained with 1% diphenylamine in ethanol, resulting in green- to violet-colored spots. One of the fractions is noticeably different from the other stain/pesticide spots. To take advantage of this color difference, a multiwavelength video TLC scanner is used to determine the reflectance spectrum of each compound in situ. From the digital image resulting from the ratio of two images taken at different wavelengths, the integrated intensity of each pesticide spot is measured and a calibration curve is developed. Detection limits are approximately 1 μg for each pesticide

Keywords

biological techniques and instruments; chromatography; densitometry; television applications; calibration curve; detection limits; digital image processing; diphenylamine; ethanol; organo-halide pesticides; pesticide residues quantitation; priority pollutants; reflectance spectrum; thin layer chromatograms; video densitometry; Chemicals; Chemistry; Data acquisition; Gold; Image processing; Instruments; Protocols; Sequences; Silicon compounds; Solvents;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in

Conference_Location

Seattle, WA

Type

conf

DOI

10.1109/IEMBS.1989.96398

Filename

96398