At higher temperature, the baseline was
instable and the area peak values lower. The best results were obtained
with a nebulization temperature of 45 °C and an evaporation temperature
of 55 °C which were fixed for further experiments. In this detector,
the attenuation of the signal can be modulated between 1 and 9, the
highest response corresponding to 9; this value was set to obtain the
higher sensitivity although it negatively affects to the background
noise, increasing the baseline instability. The nitrogen pressure provided
by the nitrogen generator was of 36 psi. For this evaporative detector a
high filter was selected as optimum value among the three options
available (high, medium and low)