 E-mail
for more information
Company's
other products
E-mail
to a colleague
See
similar products
Printer
friendly format
|
|
Analysis of Pesticides and PCBs Using an LVSL Technique
by Trisa Robarge, Eric Phillips, Meredith Conoley, Thermo Electron Corp.
Introduction
Today, many laboratories face the challenge of accurately analyzing pesticides and polychlorinated biphenyl (PCB) residues. In addition, the need for lower detection limits of these compounds forces labs to find ways to attain results in the pg/μL range. By combining a large-volume splitless (LVSL) injection with a full-scan GC/MS system, low-level samples can be analyzed with very little preparation time.
A large-volume, splitless injection technique was developed that exploits a unique injection port design. This injection port design eliminates problems typically associated with large solvent volumes. The technique was optimized using a special software tool, and evaluated using standards containing pesticides and PCBs at concentrations ranging from 1.25 to 250 ppb in hexane.
Correlation coefficients for standards in this evaluation were greater than 0.99 for all components (Figure 1). Reproducibility data was obtained through repeated injections of seven standards at 2.5 ppb. Both spiked and blank chrysanthemum tea extracts were also analyzed. Large-volume splitless injection proved to be a rugged technique that offers the environmental laboratory an additional option in the effort to decrease detection limits.
For the complete article with images, please click here to view the file in PDF format.
In order to view the PDF file, you must have Adobe's Acrobat Reader installed on your computer, click here to download the reader.
Thermo Scientific
2215 Grand Avenue Pkwy.
Austin, TX, 78728-3812
|
