A new method to determine pesticide residue in water is
presented. The described method includes using off-line
solid-phase extraction (SPE) and on-line reversed-phase
liquid chromatography-gas chromatography (RPLC-GC).
An interface, based on a modified programmed temperature vaporizer (PTV) injector, packed with a suitable
trapping material, is used for on-line RPLC-GC. The
changes made in the PTV injector affect the pneumatic
system, sample introduction, and solvent elimination. The
new interface is easily capable of automation. Methanol/
water (70/30) is used as the eluent in the LC preseparation step. The LC column flow during elution is different
from the flow during the transfer step. The transferred
volumes range from 500 to 1400 µL (volume of the
fractions of interest). Solvent elimination is almost 100%
before the sample reaches the GC column. The described
system does not show any variation of the peak retention
times. The detection limit for real samples ranges from
0.04 to 1.5 ng/L, using NP detection.
A new method to determine pesticide residue in water is
presented. The described method includes using off-line
solid-phase extraction (SPE) and on-line reversed-phase
liquid chromatography-gas chromatography (RPLC-GC).
An interface, based on a modified programmed temperature vaporizer (PTV) injector, packed with a suitable
trapping material, is used for on-line RPLC-GC. The
changes made in the PTV injector affect the pneumatic
system, sample introduction, and solvent elimination. The
new interface is easily capable of automation. Methanol/
water (70/30) is used as the eluent in the LC preseparation step. The LC column flow during elution is different
from the flow during the transfer step. The transferred
volumes range from 500 to 1400 µL (volume of the
fractions of interest). Solvent elimination is almost 100%
before the sample reaches the GC column. The described
system does not show any variation of the peak retention
times. The detection limit for real samples ranges from
0.04 to 1.5 ng/L, using NP detection.
การแปล กรุณารอสักครู่..
![](//thimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)