Multiresidue liquid chromatographic method for simultaneous determination of pyrethroid insecticides in fruits and vegetables
Pang, G.F.; Chao, Y.Z.; Liu, X.S.; Fan, C.L.
Journal - Association of Official Analytical Chemists 78(6): 1474-1480
1995
ISSN/ISBN: 0004-5756 PMID: 8664585 Document Number: 454764
A simple and rapid liquid chromatographic (LC) method has been developed for simultaneous determination of 9 pyrethroid insecticides (biphenthrin, cypermethrin, fenpropathrin, fenvalerate, flucythrinate, methothrin, permethrin, py-115, and tetramethrin) in fruits and vegetables. Residues are extracted from crops with methanol and partitioned with toluene. Extracts are cleaned up by Florisil-charcoal column chromatography. LC separation is performed on a mu-Bondapak C-18 stainless steel column with acetonitrile-deionized water as mobile phase. The insecticides are detected at 206 nm with 0.03 absorbance unit full scale. Recoveries of 9 pyrethroid insecticides from 6 crops (cucumbers, tomatoes, cabbages, apples, pears, and peaches) fortified at 0.5-5.0 mg/kg were 62.7-129.2%. Detection limits were about 0.05 mg/kg, except for py-115, for which detection limit was 0.10 mg/kg.