143 
chromatograph (Varían, Wallnut Creek, USA) applying a capillary of 15 m length and 
0.25 mm ID coated with a film of 0.25 pm DB5-MS (5 % phenyl-methylpolysiloxane, 
J&W Scientific, Folsom, USA). An injector temperature of 240 °C and Helium as 
carrier gas (flow 2 ml/min, quality 5.0, Carbagas, Switzerland) were used. The 
temperature programme was as follows: 90 °C for 2 min, then with 15 °C/min to 
260 °C, isothermal for 2 min. Splitless injections (splitless time 2 min) of 2.0 pi sample 
volume were carried with a Pal autosampler (CTC Analytics, Zwingen, Switzerland). 
The following EI-MS/MS conditions were applied: Electron energy 70 eV, filament 
current 150 pA, resolution of quadrupole 1 at 0.8 u and of quadrupole 3 at 1.2 u, Ar as 
collision gas at a pressure of 0.12-0.15 Pa (0.9-1.1 mTorr). The selected ions to be 
fragmented as well as further parameters are given in Table 46. The precursor ion m/z 
383 [M-C1] + and the product ion m/z 276 [M-4C1] + were selected for the internal 
standard 1 ’Cio-/ra/7.s'-chlordanc (collision energy -26 V). The dwell time was 50 ms per 
ion. 
Table 46: Selected precursor and product ions for the determination of selected chlordanes by EI-MS/MS 
with a triple quadrupole mass spectrometer. Important instrument parameters and the masses for the 
internal standard 13 Cio-fran.s-chlordane are also given. 
Compound 
Precursor ion (m/z) 
Product ion (m/z) 
Collision energy (V) 
Oxychlordane 
185 
121 
-17,5 
frans-heptachlorepoxide 
217 
181 
-22,5 
Heptachlor, 4,5-DCCD 
272 
237 
-22,5 
cis- heptachlorepoxide 
353 [M-C1] + 
265 
-25,0 
rra /; .v/W.v -C h 1 o rd a n e 
373 [M-ClT 
266 [M-4C1] + 
-25,0 
13 Ci 0 -frani-Chlordane 
383 [M-C1] + 
276 [M-4C1] + 
-26,0 
trans/cis-Nonachlor 
409 [M-ClT 
300 [M-4C1 ] + 
-25,0