Abstract
p-Chlorophenyl p-chlorobenzenesulfonate (CPCBS) and bis(p-chlorophenoxy) methane (DCPM) in emulsifiable concentrate or wettable powder weredetermined by gas-liquid chromatographic method using benzyl benzoate as an internal standard. A Shimadzu gaschromatograph GC-2B with a thermal conductivity detector was used. The stainless columm (4mm×2m) was packed with 15% FS 1265 as stationary phase on a support of Chromosorb W (acidwashed). The columm temperature was adjusted to 200°C and the flow rate of the carrier gas, helium, was maintained as 80 ml per minutes. The emulsifiable concentrate was injected to gaschromatograph after being mixed with the internal standard. The cornpounds in wettable powder were extracted with a 1+1 mixture of acetone and toluene containing benzyl benzoate and applied to gaschromatography. The relative retention times of DCPM and CPCBS against benzyl benzoate were 2.17 and 5.88, respectively. The results of analysis of technical products and formulations were tabulated in Table II. It was proved by gas chromatography that DCPM isolated from technical product by partition chromatography contained some impurities.
