142 
Table 45: Mass-to-charge ratios of ions of single chlordane compounds used for quantification and 
identification in the ECNI-MS mode. 
Compound 
Quantification ion 
m/z 
Identification ion 
m/z 
frans-Chlordane 
410 [M+4]" 
408 [M+2]" 
r/.v-Chlordane 
410 [M+4] - 
408 [M+2]" 
frans-Nonachlor 
444 [M+4] - 
442 [M+2]" 
rz.v-\onachlor 
444 [M+4] - 
442 [M+2]" 
MC5 
410 [M+4] - 
408 [M+2]" 
MC7 
410 [M+4] - 
408 [M+2]" 
MC8 
410 [M+4] - 
408 [M+2]" 
Oxy-chlordane 
354 [M+6-2C1-2H]" 
352 [M+4-2C1- 
2H]- 
Oxy-chlordane 
424 [M+2]" 
422 [M]- 
4,5- 
Dichlorochlordene 
302 [M] 
299 [M-2C1-HC1] 
Heptachlor 
302 [M+2-2C1]" 
300 [M-2C1]" 
trans- 
Heptachlorepoxide 
354 [M+2-C1+H]" 
352 [M-Cl+H]- 
cis- 
Heptachlorepoxide 
390 [M+4]' 
388 [M+2]' 
Alternatively, a CP 3800 gas chromatograph (Varían, Walnut Creek, USA) was 
employed for detection combined with a triple quadrupole mass spectrometer (1200L, 
Varían, Walnut Creek, USA). The injected volume was 2 pi in the splitless mode (2.5 
min splitless time, Combi Pal autosampler, CTC Analytics, Switzerland). The injector 
temperature was 240 °C. He was used as carrier gas (99,999 % purity, Carbagas, 
Switzerland) at a head pressure of 68.9 kPa (10 psi). The following temperature 
programme was employed: 90 °C isothermal for 2 min, with 30 °C/min to 150 °C, then 
4 °C/min to 210 °C and finally with 20 °C/min to 260 °C (5 min isothermal). Methane 
was used as reagent gas (99,995 %, Carbagas, Switzerland) at a pressure of 7.3 mbar 
(5.5 Torr). The dwell time was 0.5 s per ion group. 
5.6.10 Quantification of chlordanes by EI-MS/MS 
The standard ECNI quantification was checked by an additionally developed EI-MS/MS 
method. Gas chromatographic separations were carried out on a CP-3800 gas