[Determination of twenty pesticide residues in Viscum coloratum by gas chromatography using cloud-point extraction].

OBJECTIVE

To establish a gas chromatography method for simultaneous determination of organochlorine and pyrethroid pesticide residues in Viscum coloratum by cloud-point extraction (CPE).

METHOD

Pesticides were extracted with the non-ionic surfactant Triton X-100. The apparatus was gas chromatography with electron capture detector and the separation was performed on an Hp-5 column. The pesticide residues were calculated by external standard method.

RESULT

Good linear relation was obtained over the range of 5-500 microg L(-1) for organochlorine and 10-1,000 microg L(-1) for pyrethroid. The limits of detection was 1.5-7.5 microg kg(-1). The average recoveries of organochlorine and pyrethroid were 74.15% -111.6% with corresponding RSD of 4.0% -9.1%.

CONCLUSION

The sample and rapid method was applied to pesticide residues determination.