A home-made EESI source was coupled to a LTQ XL linear ion trap mass spectrometer (San Jose, CA) for the direct analysis of sampled illicit additives and contaminants in cosmetics. The angle between the sample outlet and the electrospray beam (ˇ,
Fig. 1) was 60◦. The angle between the electrospray beam and the heated capillary of the LTQ instrument (˛, Fig. 1) was 150◦, which was equivalent to the one formed by the sample outlet and the heated capillary of the LTQ instrument. The distance between the inlet of the LTQ instrument and the gas outlets (a,Fig. 1) was 15 mm.The distance between the two spray tips (b, Fig. 1) was 6 mm.