222 
6.6.7 Procedure for the analysis of Dicofol in water 
Extraction see chapter 6.6.3. 
6.6.7.1 GC-EI method for Dicofol 
Because of its low thermal stability, dicofol could not be analysed by the NCI method 
described in chapter 6.2. Dicofol was analysed using an “on-column” injector. The 
analyses were carried out with a capillary gas chromatograph coupled to a MD800 mass 
spectrometer (Thermo Electron). Separations were conducted as follows: 
Column: 
Pre-column: 
Carrier gas: 
Oven: 
Injector: 
Detector: 
Source temperature: 
Interface temperature: 
HP-5 (Cross-linked 5 % Phenyl ME Polysiloxane) 30 m 
x 0.25 i. d. x 0.5 pm 
HP-retention gap (uncoated, deactivated), ID 0.53 pm 
ZB-5 
Helium 1.5 mL/min 
50 °C/ 0.1 min isotherm; linear temperature gradient 
(10 °C/min to 300 °C); 10 min isotherm) 
on-column injection 
MS from Thermo Electron MD800, El source 
200°C (El) 
250°C 
Table 84 shows the GC-MS parameters for Dicofol. 
Table 84: Parameters of Dicofol: molecular weight (MW), retention time (RT; GC conditions see above) 
and masses used for analysis in SIM mode (m/z) 
Substance 
MW [g/mol] 
RT [min] 
m/z 
Dicofol 
368 
20.65 
253,251, 139