title: New method for the determination of 1,1-dimethylhydrazine residues in apples and peaches.
abstract: A new method for determining 1,1-dimethylhydrazine (UDMH) in peaches and apples is presented. The method consists of extraction with L-ascorbic acid, derivatization with 2-nitrobenzaldehyde to the corresponding hydrazone, and cleanup on an alumina column. The hydrazone derivative is determined by gas chromatography using an electron-capture detector. Recoveries were determined from 10 to 100 ppb. Stability of the UDMH residues on frozen peaches was investigated, and results indicate that the residues degrade even while frozen.
mesh_terms: D002849:Chromatography, Gas; D004127:Dimethylhydrazines / Q000032:analysis*; D005638:Fruit / Q000032:analysis*; D007202:Indicators and Reagents; D008763:Methylhydrazines / Q000032:analysis*
chemical_list: D004127:Dimethylhydrazines; D007202:Indicators and Reagents; D008763:Methylhydrazines