Gas-liquid Chromatographic Determination of Furamethrin

Abstract

Quantitative gas-liquid chromatographic methods for the determination of 5-propargyl2-furylmethyl dl-cis, trans-chrysanthemate, furamethrin, have been developed. The base line before the furamethrin peak of GLC drifted on the column with 2% silicone XE-60 coated on 60_??_80 mesh, acid-washed and DMCS-treated Chromosorb W (Method B), which suggested partial decomposition of furamethrin, however, a fine chromatogram was obtained when sodium borate was added to the column supporter (Method A). By utilizing an adequate internal standard, furamethrin was determined with the standard deviation of about 0.8% by Method B as well as Method A, the values being substantially equal to those obtained by the TLC-UV method previously reported. In addition, the trans and cis isomers in technical products of furamethrin were separated from each other on a 5% silicone DCQF-1 column and the results obtained by analyzing the mixtures indicate that the ratio can be accurately determined by their area ratio.