Supplemental data:
Chromatographic separation and detection were carried out using an Agilent
7890A gas chromatograph equipped with a 5975c mass spectrometer (Agilent
Technologies, Böblingen, Germany). A 30 m DB5-MS column (0.25 mm id and 0.25
μm film thickness; J&W, Folsom, USA) was used as the stationary phase for
separation. Helium (6.0 quality, Hydrogas, Porsgrunn, Norway) was used as carrier
gas at a flow rate of 1 mL/min with a 1 μL injection volume in splitless mode using a
split/splitless injector. The following temperature program was used: 70 C (held for 2
min), then 15 C/min to 180C and 5 C/min to 280 C (held for 10 min). Ionisation
energy of 70 eV was used to ionized sample gas. The electron capture negative
ionization mode was used for determination and quantification of the pesticides and
PBDEs while electron impact mode was used for PCB and DDT determination and
quantification.