| dc.description.abstract | Analysis of pyrethroid pesticide residues (lamda sihalotrin) on pakcoy (Brasssica
rapa subsp.chinensis) by Gas chromatography method has been carried out. The
purpose of this study was to determine the residual levels of pyrethroid pesticides in
pakcoy (Brasssica rapa subsp. chinensis). Analysis of residual levels was determined
using gas chromatography with the extraction method. With the experimental
sequence, the sample was cut into pieces and dissolved with acetone,
dichloromethane and petroleum ether, smoothed with ultraturax and left to stand
until the filtrate and residue separated. The filtrate will be dried using a rotary
evaporator and the result will be dissolved in isooctane and toluene in a ratio
(90:10) and put into a test tube. Then determine the yield of the extract injected 1-2
μL in a gas chromatograph equipped with a specific detector for compounds
containing elemental phosphorus (FPD) and (AFID). From the results of the
analysis carried out, it was obtained that the pesticide residue levels in pakcoy from
Berastagi District detected one active ingredient, namely lambda sialothrin as much
as 0.164 mg/kg, while pakcoy from Raya District and Gundaling District did not
have an active ingredient in the form of lambda sialothrin (not detected) | en_US |
