title: Modification of AOAC multiresidue method for determining synthetic pyrethroid residues in fruits, vegetables, and grains. Part III: Studies of analyte stability and method ruggedness.
abstract: The stability of 8 synthetic pyrethroids in 9 crops during storage for 90 days were studied. The 8 pyrethroid insecticides were highly persistent in the 6 grains during storage. But their stabilities in 3 kinds of fruits and vegetables were different from those in the 6 grains: Most of them were degraded. Florisil purification conditions were studied with 6 batches of Florisil from 3 countries at various extents of deactivation and amounts. The best conditions of Florisil purification found in this present research agree with those found 1 year ago. The efficiencies of acetonitrile and acetone to extract the 8 pyrethroids from 6 fruit and vegetable samples were compared. The extraction efficiency of acetone was competitive with that of acetonitrile for the 6 fruit and vegetable samples. Method performance was evaluated by 6 analysts from different areas. The ruggedness tests demonstrate further that the proposed method is simple, accurate with good precision, and suitable for multiresidue analysis of pyrethroids in various agriculture products.
authors.affiliation: Qinhuangdao Import and Export Commodity Inspection Bureau, Hebei, P.C., People's Republic of China.
authors.forename: G F
authors.initials: GF
authors.lastname: Pang
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Cao
authors.forename: C L
authors.initials: CL
authors.lastname: Fan
authors.forename: J J
authors.initials: JJ
authors.lastname: Zhang
authors.forename: X M
authors.initials: XM
authors.lastname: Li
mesh_terms: D000096:Acetone / Q000737:chemistry; D000097:Acetonitriles / Q000737:chemistry; D002523:Edible Grain / Q000737:chemistry; D005638:Fruit / Q000737:chemistry; D005659:Fungicides, Industrial / Q000032:analysis* / Q000378:metabolism; D007306:Insecticides / Q000032:analysis* / Q000378:metabolism; D017633:Magnesium Silicates / Q000737:chemistry; D009570:Nitriles; D026023:Permethrin; D010573:Pesticide Residues / Q000032:analysis* / Q000378:metabolism; D011722:Pyrethrins / Q000032:analysis* / Q000378:metabolism; D012015:Reference Standards; D014675:Vegetables / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D005659:Fungicides, Industrial; D007306:Insecticides; D017633:Magnesium Silicates; D009570:Nitriles; D010573:Pesticide Residues; D011722:Pyrethrins; C005013:Florisil; D000096:Acetone; C017160:cypermethrin; C034227:fluvalinate; D026023:Permethrin; C044267:fenpropathrin; C037304:cyhalothrin; C032159:acetonitrile; C017690:fenvalerate