Abstract
A method has been proposed for the gas-liquid chromatographic determination of 3, 4-dichloropropionanilide (DCPA) in technical products and emulsifiable concentrates. The DCPA was dissolved in toluene and analyzed with added benzyl benzoate (BB) as an internal standard by a Shimadzu Gas Chromatograph GC-2B with a thermal conductivity detector, using helium as carrier gas, the flow rate of which was maintained as 100ml per minute. The column (4mm×1m, stainless steel) used contained 30 weight per cent Apiezon grease L as the stationary phase and 1 weight per cent Emulsogen WS-32 as the tailing reducer on the support of Celite 545 and the column temperature was adjusted to 230°C.
A calibration curve in the 0.31.6 weight ratio (DCPA/BB) was found to be almost linear and passed through the zero point. The standard deviation and the mean recovery of the proposed method were calculated to be 1.35%, and 99.9%, respectively for the prepared emulsifiable concentrates.
